Operating Instructions

Transcription

1 Level and Pressure Operating Instructions VEGADIF p

2 Contents Contents Safety information... 3 Note Ex-area Product description 1.1 Function and configuration Types and versions Type plate Technical data Dimensions Approvals Mounting 2.1 Verifying operating conditions Pre-installation Mounting Electrical connection 3.1 Connection instructions Load resistance Connections Ex-applications Setup 4.1 Adjustment structure Adjustment with 4-key adjustment element Adjustment with HART handheld Adjustment with PC VEGADIF 34 51

3 Contents 5 Typical installation connections 5.1 Valves Impulse lines Differential pressure measurement Level measurement Flow measurement Diagnostics 6.1 Failure codes Instrument modification Safety information The described module must only be installed and operated as described in these operating instructions. Please note that other action can cause damage for which VEGA does not take responsibility. Note Ex-area Please note the approval documents (yellow binder), and especially the included safety data sheet. VEGADIF

4 Product description 1 Product description 1.1 Function and configuration Function VEGADIF differential pressure transmitters are an efficient, modular instrument series for differential pressure, level and flow measurement. The sensor element of VEGADIF 34 and 44 is a single-chamber ceramic measuring cell. It consists of a disk-shaped ceramic body with ceramic diaphragms on both sides. According to the pressure the diaphragms move and the capacitances change. The difference of the individual capacitances is reciprocally proportional to the difference of the pressures. The sensor element of VEGADIF 35, 45 and 51 is a silicium plate with pressure sensitive resistors. The differential pressure to be measured is received via separating diaphragms and transmitted to the sensor element via incompressible oil (silicone oil or inert oil). The silicium plate moves according to the differential pressure. The values of the resistors change (piezoresistive principle). The external power supply is provided via a separate supply instrument, e.g.: - power supply instrument (e.g. VEGASTAB 690) - processing unit with integral direct voltage source (e.g. active DCS-input) - VEGAMET series 500 or 600 signal conditioning instrument, VEGALOG 571 processing system or VEGADIS 371 indicating instrument Configuration Each VEGADIF consists of only two modular components: - the electronics housing - the measuring cell housing. Sensor specific data are permanently stored in an ASIC in the sensor. Hence the measuring cell modules can be changed, e.g. ceramic for silicium and vice versa. The electronics can be changed, e.g. from 4 20 ma standard to 4 20 ma with HART -communication protocol, without dismounting the transmitter. The capacitance or resistance values are detected by the integral electronics and converted into a 4 20 ma output signal. This output signal is proportional to the difference of the pressures. Precise digital processing of measured data with maximum resolution ensures excellent technical performance. The electronics in the pressure transmitter requires a supply voltage of V DC. 4 VEGADIF 34 51

5 Product description 1.2 Types and versions VEGADIF 34 Measuring cell: ceramic-capacitive Process connection: acc. to DIN Standard application: Differential pressure and flow measurement with gases, vapours and liquids VEGADIF 34 VEGADIF 35 Measuring cell: silicium-piezoresistive with metal separating diaphragms Process connection: acc. to DIN Standard application: Differential pressure and flow measurement with gases, vapours and liquids, with differential pressure up to 40 bar and static pressures up to 420 bar VEGADIF 35 VEGADIF 44 Measuring cell: ceramic-capacitive Process connection: Plus side flange, minus side acc. to DIN Standard application: Level measurement in pressurized vessels, even with suspended solids, abrasive or high viscosity products VEGADIF 44 VEGADIF

6 Product description VEGADIF 45 Measuring cell: silicium-piezoresistive with metal separating diaphragm Process connection: Plus side flange, minus side acc. to DIN Standard application: Level measurement in pressurized vessels, even with product temperatures up to 400 C VEGADIF 45 VEGADIF 51 Measuring cell: silicium-piezoresistive with metal separating diaphragms Process connection: Cell isolating diaphragm in standard series, connected via capillary lines Standard application: Level, differential pressure and flow measurement especially with high-viscosity products, high temperatures and in food processing industries For applications in hazardous areas as well as overfill protection acc. to WHG certified instruments are available VEGADIF 51 6 VEGADIF 34 51

7 Product description 1.3 Type plate Check before mounting and electrical connection that you are using a suitable differential pressure transmitter. Observe type and calibration plate which are located as follows: Calibration plate Type plate Product coding example type DIF35AC4E1VH3C Process connection flange Measuring cell seal PTFE 2 ventilation valves, 1 mounting loop Nominal value calibration in mbar/bar Nom. meas. range 160 mbar, static pressure max. 140 bar LC-indication top Cable entry Pg 13.5 Configuration of the calibration plate (example) Cal. Adj MBAR Both plates include important data required for mounting and connection. The configuration and contents of the plates are explained in the following example. Calibration range mbar Configuration of the type plate (example) 1 2 VEGA VEGADIF Made in Germany Order Code DIF35 AC4E1 VH 3C Ser.-No p mbar Pmax 140 bar 4 20mA U 11,5 45 V DC Mat PTFE 1 Basic data of the order no. 2 Serial number VEGADIF

8 Product description 1.4 Technical data Mechanical data Materials, wetted parts VEGADIF 34 - Diaphragm Aluminiumoxideceramic (Al 2 O 3 ) - Process seal FPM, Hastelloy C4 PTFE-plated, EPDM, FPM for oxygen application, Kalrez - Process connection carbon steel C22.8 chromized , stainless steel or , Hastelloy C , PVDF (PN 10) - Ventilation valves stainless steel or , Hastelloy C (only with process connection Hastelloy) VEGADIF 35 - Separating diaphragms stainless steel Process seal FPM, NBR, PTFE, FPM for oxygen applications - Process connection carbon steel C22.8 chromized stainless steel or , Hastelloy C Ventilation valves stainless steel or , Hastelloy C (only with process connection Hastelloy) VEGADIF 44 - Diaphragm Aluminiumoxideceramic (Al 2 O 3 ) - Process seal FPM, Hastelloy C-4 PTFE-plated, EPDM, FPM for oxygen application, Kalrez - Process connection (plus side) carbon steel C22.8 chromized , stainless steel , stainless steel PTFE coated Hastelloy C Process connection (minus side) carbon steel C22.8 chromized , stainless steel or , Hastelloy C VEGADIF 45 - Isolating diaphragm stainless steel Process flange (plus side) stainless steel Process flange (minus side) carbon steel C22.8 chromized , stainless steel or , Hastelloy C VEGADIF 51 - Isolating diaphragm stainless steel Process connection carbon steel C22.8 chromized , stainless steel or , Hastelloy C VEGADIF 34 51

9 Product description Materials, non-wetted parts Common components - Electronics housing and cover Al-casting (Cu-free), protective coating 1) Polyester based, colour yellow RAL 1018, black RAL (cover) - Type plates stainless steel O-rings for cover seal NBR - Screws and nuts for measuring cell housing or process connection carbon steel C Mounting loop corresponding to process connection carbon steel C22.8, stainless steel VEGADIF 34 - Fill fluid of the measuring cell silicone oil, mineral oil, Voltalef 1 A 2) VEGADIF 35 - Measuring cell housing stainless steel Fill fluid of the measuring cell silicone oil, Fluorlube 2) VEGADIF 44 - Fill fluid of the measuring cell silicone oil, mineral oil, Voltalef 1 A 2) VEGADIF 45 and VEGADIF 51 - Measuring cell housing stainless steel Fill fluid of the measuring cell silicone oil, vegetable oil, glycerine, high temperature oil, oil for oxygen applications - Capillary line stainless steel Fill fluid of the measuring cell silicone oil, Fluorlube 2) Weights VEGADIF 34 VEGADIF 35 VEGADIF 44 VEGADIF 45 VEGADIF 51 Isolating diaphragm approx. 5 kg 4 6 kg, depending on version kg, depending on flange size 6 12 kg, depending on flange size and extension length 4 kg plus capillaries and flange isolating diaphragm see tables in "1.5 Dimensions - Isolating diaphragm" 1) Sea water resistance (salt spray test acc. to DIN passed for 504 h) 2) for applications in pure gases VEGADIF

10 Product description Electrical data Connection Cable entry Pg 13.5 (for cable-ø 9 12 mm) 1) Screw terminals for conductor cross-sections up to 2.5 mm 2 Earth terminal for conductor cross-sections up to 4 mm 2 Supply and signal circuit (4 20 ma-signal) Supply voltage - not Ex-instruments V DC - Ex-instruments V DC Residual ripple no influence at U SS 4.5 V Output signal 4 20 ma linear (differential pressure proportio nal) or square root (flow proportional changeable) Resolution better than 6 µa Current limitation approx. 23 ma Measuring range decrease 2.8 ma (standard) or 4 ma Measuring range exceed 20.5 ma acc. to NAMUR Fault signal (adjustable) 3.6 ma, 21.5 ma, current value Integration time 2) 0 16 s with keys on the instrument 0 40 s with HART handheld Adjustment period s depending on measuring range Raising time s depending on measuring range Heating time 2 s Connection line 2-wire Max. permissible load depending on supply voltage 1560 Load R total in Ohm , , Voltage of the external energy U H in Volts Supply and signal circuit (digital communication signal HART ) Connection line 2-wire (the communication must not be influenced by unshielded cables) Line resistance 25 W/km Total resistance higher than 250 W (communication resistance of min. 250 W required) Total capacitance smaller than 180 nf Max. length 1000 m 1) with smaller cable diameter a suitable seal must be provided by the customer 2) adjustment time of 10 % 63 % of the measuring range final value 10 VEGADIF 34 51

11 Product description Protective measures Protection IP 65 IP 68 (option for VEGADIF 35, 45 and 51) Protection class III CE-protective measures VEGADIF 34, VEGADIF 35, VEGADIF 44, VEGADIF 45 and VEGADIF 51 differential pressure transmitters meet the protective regulations of EMC (89/336/EWG) and NSR (73/23/EWG). The conformity has been judged acc. to the following standards: EMC Emission EN Susceptibility EN NSR EN NAMUR-regulations Full compliance with the NAMUR-regulations NE21, May Transmission reaction Measuring ranges VEGADIF 34 and VEGADIF 44 Features Limits Span System pressure Pressure transmission Nom. liquid meas. Initial Final value minimum maximum Overload Overload in the sensor ranges value unilateral bilateral 25 mbar -25 mbar 25 mbar 5 mbar 25 mbar 10 bar 10 bar silicone oil 1) 100 mbar -100 mbar 100 mbar 5 mbar 100 mbar 16 bar 2) 25 bar 2) silicone oil 1) 500 mbar -500 mbar 500 mbar 25 mbar 500 mbar 100 bar 2) 140 bar 2) mineral oil 1) 3000 mbar mbar 3000 mbar 150 mbar 3000 mbar 100 bar 2) 140 bar 2) mineral oil 1) VEGADIF 35, VEGADIF 45 and VEGADIF 51 Features Limits Span System pressure Pressure transmission Nom. liquid meas. Initial Final value minimum maximum Overload Overload in the sensor ranges value unilateral bilateral 10 mbar 3) -10 mbar 10 mbar 2 mbar 10 mbar 140 bar 140 bar silicone oil 1) 40 mbar 3) -40 mbar 40 mbar 5 mbar 40 mbar 140 bar 140 bar silicone oil 1) 160 mbar -160 mbar 160 mbar 10 mbar 160 mbar 140 bar 140 bar silicone oil 1) 1000 mbar mbar 1000 mbar 50 mbar 1000 mbar 420 bar 4) 420 bar 4) silicone oil 1) 6000 mbar mbar 6000 mbar 300 mbar 6000 mbar 420 bar 4) 420 bar 4) silicone oil 1) mbar 3) mbar mbar 2000 mbar mbar 100 bar 420 bar 4) silicone oil 1) Minimum pressure VEGADIF 34, 35 and 44 VEGADIF 45 and 51 1 mbar abs 10 mbar abs 1) in applications with pure gases Voltalef 1 A 2) 10 bar with process connection PVDF for VEGADIF 34; 40 bar with process flange for VEGADIF 44 3) only VEGADIF 35 4) note nominal pressure of the flanges VEGADIF

12 Product description Output characteristics Determination of characteristics fixed point method acc. to VDI/VDE 2600, sheet 4 (corresponds to the limit point adjustment acc. to DIN ) Characteristics linear (differential pressure proportional), changeable to square root (flow proportional) Accuracy data 1) Feature Accuracy 2) Hysteresis Repeatability Instrument VEGADIF 34 better than 0.1 % better than 0.05 % better than 0.05 % VEGADIF 35 better than 0.1 % better than 0.1 % better than 0.1 % VEGADIF 44 better than 0.1 % better than 0.05 % better than 0.05 % VEGADIF 45 better than 0.2 % better than 0.1 % better than 0.1 % VEGADIF 51 better than 0.2 % better than 0.1 % better than 0.1 % Long-term stability of the zero signal 3) better than 0.1%/12 months (VEGADIF 34 and 44) better than 0.2%/12 months (VEGADIF 35, 45, 51) Influence of other actuating variables Influence of the static pressure to zero and span better than 0.2 %/PN (VEGADIF 34 and 44) better than 0.2 %/100 bar (VEGADIF 35, 45, 51) Electromagnetic compatibility (EMC) interference immunity to NAMUR: 30 V/m Influence of vibration 5) 6) better than ±0.1 % acc. to DIN/IEC 68, part 2-6 Climatic class GPC acc. to DIN Calibration position upright Influence of the mounting position max. 2 mbar Temperature influence Average temperature influence of the zero signal 3) 4) or the output span better than 0.02 %/10 K ( C) better than 0.1 %/10 K ( C a. 60 C 85 C) 1) Similar to DIN ) relating to the nominal measuring range with recommended turn-down limit of 20 : 1 3) relating to the nominal measuring range, reference temperature 25 C, with recommended turn-down limit of 20 : 1 4) with VEGADIF 45 and 51 without isolating diaphragm or capillaries, see temperature influence 5) relating to the nominal measuring range 6) with silicium measuring cell measured on 6000 mbar sensor 12 VEGADIF 34 51

13 Product description Additional temperature influence 1) with VEGADIF 45: - by isolating diaphragm Process connection effective Temperature coefficient diaphragm-ø [mbar/10 K] Flange DN 50 PN 40 acc. to DIN 2501, Seal surface acc. to DIN 2526 form D 46 mm 5.0 Flange DN 80 PN 40 acc. to DIN 2501, Seal surface acc. to DIN 2526 form D 70 mm 3.0 Flange DN 80 PN 40 with extension 50 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 100 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 150 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 200 mm 70 mm 3.0 Additional temperature influence 1) with VEGADIF 45: - by isolating diaphragm Isolating diaphragm series effective Temperature coefficient diaphragm-ø [mbar/10 K] unilateral bilateral Cell DN 50 PN 16/ mm Cell DN 80 PN 16/ mm Cell DN 100 PN 16/ mm Cell 3" class 150/ / 4 " Cell 4" class 150/ / 4 " DIN , nut DN 50 PN mm DIN , nut DN 65 PN mm DIN , nut DN 80 PN mm DIN , socket DN 50 PN mm DIN , socket DN 65 PN mm DIN , socket DN 80 PN mm Clamp 2" PN mm Clamp 3" PN mm DRD-flange DN mm by capillary line 2) per m 0.5 mbar/10 K (unilateral) 0.12 mbar/10 K (bilateral) Operating conditions Product features Aggregate Condition gaseous, vapour, liquid to high viscosity also abrasive or aggressive with suitable material selection of wetted parts acc. to order code 1) standard values relating to isolating liquid silicone oil 2) both capillary lines are supplied with the same length VEGADIF

14 Product description Temperatures Ambient temperature Medium temperature - VEGADIF 34 and VEGADIF 44 FPM (Viton, Fluor-caoutchouc) PTFE (Hastelloy C4, from p abs ³ 900 mbar) EPDM FPM (Viton for oxygen, oil and grease free) Kalrez -40 C +85 C (for indication: -20 C +85 C) -20 C +85 C -40 C +85 C -40 C +85 C -10 C +85 C -10 C +85 C - VEGADIF 35 and minus side VEGADIF 45 FDM (Viton, Fluor-caoutchouc) -20 C +85 C NBR -20 C +85 C PTFE, from p abs ³ 1 mbar -40 C +85 C FPM (Viton for oxygen, oil and grease free) -10 C +85 C - Plus side VEGADIF 45 and VEGADIF 51 Isolating liquid: p abs ³ 1 bar / 1) 0.05 bar p abs < 1 bar - silicone oil -40 C +200 C / -40 C +180 C - vegetable oil -10 C +200 C / -10 C +120 C - glycerine +15 C +200 C / - high temperature oil -10 C +350 C / -10 C +200 C - oil for oxygen application -40 C +175 C / -40 C +80 C Storage and transport temperature -40 C +100 C (VEGADIF 34 and 44) -50 C +100 C (VEGADIF 35, 45 and 51) Ex-technical data CENELEC General data Classification mark EEx ia IIC T4/T6 Intrinsically safe supply and signal circuit Classification EEx ia IIC Only for connection to certified, intrinsically safe circuits with the max. values: - voltage U O = 30 V - current I K = 300 ma - efficiency P = 1 W Inner effective capacitance C int = 11.2 nf Inner effective inductance L int = 0.2 mh Ambient conditions Ambient temperature around the oscillator - temperature class T6-40 C +40 C - temperature class T5-40 C +55 C - temperature class T4-40 C +85 C 1) at p abs < 1 bar (vacuum range) the isolating liquid boils already at lower temperatures 14 VEGADIF 34 51

15 Product description 1.5 Dimensions VEGADIF x View x y mbar M10 7 / UNF View y 41,3 1 / 4 " - 18 NPT Mounting loop (optional) Z S M10 7 / UNF PVDF 41,3 1 / 4 " - 18 NPT with PVDF-flange VEGADIF (93) 41,3 M10 (M12) 7 / UNF 1 / 4 " - 18 NPT (135) 106 (110) The values in brackets relate to PN 420 VEGADIF

16 Product description VEGADIF 44 DIN-flange DN 80/DN 100 ANSI-flange 3" M10 7 / UNF M10 7 / UNF 1 / 4 " - 18 NPT 1 / 4 " - 18 NPT ;; ;; ;; ;; ;;;; ;;;; ;;;; ;;;; ;; ;; ;; ;; ;;;; ;;;; ;;;; ;;;; VEGADIF 45 M10 7 / UNF ;;; ;;; ;;; ;; ;; ;; 1 / 4 " - 18 NPT A = Installation height D = Outer flange diameter b = Flange thickness k = Diameter of hole circle d 2 = Diameter of hole d 4 = Seal ledge diameter d 5 = Extension diameter R L = Extension length d M = Diaphragm diameter d 2 ;; ;; ;; ;;; ;;; ;;; ;;;;;;;;;;;;;;; d M ;;;;;;;;;;;;; R L d 4 d5 16 VEGADIF 34 51

17 Product description Flange connection acc. to DIN 2501, seal ledge acc. to DIN 2526 form D Order Flange Holes Seal ledge Dia. Extension Install. code Size/Nominal pressure D b k No. d 2 d 4 d M R L d 5 d M height A B DN 50 / PN C DN 80 / PN D DN 80 / PN E DN 80 / PN F DN 80 / PN G DN 100 / PN Flange connection acc. to ANSI B 16.5 Order Flange Holes Seal ledge Dia. Extension Install. code Size/Nominal press. D b k No. d 2 d 4 d M R L d 5 d M height in lb/sq in in/mm in/mm in/mm in/mm in/mm in/mm in/mm in/mm in/mm A P 2 / 150 6/152 3 / 4 / 4 3 / 4 / 4 3 / 4 / 3 5 / 8 / 1 3 / 4 / 14.2/ R 3 / / 15 / 16 / 6/ 4 3 / 4 / 5 / 2 3 / 4 / 14.2/ S 3 / / 15 / 16 / 6/ 4 3 / 4 / 5/ 2/ 3/ 2 3 / 4 / 14.2/ T 3 / / 15 / 16 / 6/ 4 3 / 4 / 5/ 4/ 3/ 2 3 / 4 / 14.2/ U 3 / / 15 / 16 / 6/ 4 3 / 4 / 5/ 8/ 3/ 2 3 / 4 / 14.2/ W 4 / / 1 1 / 2 / 7 8 / 9 / 8 14 / 16 / 6 2 / 9 / 2 3 / 4 / 14.2/ VEGADIF

18 Product description VEGADIF 51 7 / UNF 1 / 4 " - 18 NPT ;;;;;;;;;;;;;; Isolating diaphragm as cell version, AA CR ;;;;;;;;;;;;;; d M acc. to DIN 2501 Order Socket Cell Min. mounting Max. Weight code Size/Nominal pressure D b d M distance A pressure approx. AA DN 50 PN bar 2.6 kg AK DN 80 PN bar 4.6 kg AM DN 80 PN 16 PTFE bar 4.6 kg AN DN 80 PN 16 Hastelloy bar 4.6 kg AR DN 100 PN bar 6.2 kg acc. to ANSI 16.5 Order Socket Cell Min. mounting Max. Weight code Size/Nom. pr. D b d M distance pressure approx. in / lb sq in in/mm in/mm in/mm A in/mm lb/sq in CK 3 / / 2 / / 4 / / 4 / 70 5 / kg CR 4 / / 4 / / 4 / / 4 / 70 5 / kg 18 VEGADIF 34 51

19 Product description Isolating diaphragm as cone socket with compression nut, FA FK ;;;; ;;;;;; ;;;; ;; d M acc. to DIN Order Socket Cell Compression nut Min. mount. Weight code Size/Nominal pr. D f d M G k m distance A approx. FA DN 50/PN Rd78x 1 / 6 " kg FE DN 65/PN Rd95x 1 / 6 " kg FK DN 80/PN Rd110x 1 / 4 " kg Isolating diaphragm as threaded socket, GA GK d 1 d M ;;;; ;;;;;; ;;; ;; acc. to DIN Order Socket Threaded socket Min. mounting Weight code Size/Nominal pres. d 1 G d M distance A approx. GA DN 50/PN Rd78/ 1 / 6 " kg GA DN 65/PN Rd95x 1 / 6 " kg GK DN 80/PN Rd110x 1 / 6 " kg Isolating diaphragm as Clamp, HA and HK ; ;;;;; ;;;;;; d M Order Socket Terminal socket Min. mounting Weight code Size/Nominal pres. D d M distance A approx. HA DN 2" PN kg HK DN 3" PN kg Isolating diaphragm as DRD-flange, KE Order Socket Dimensions Min. mounting Weight code Nominal pr. d M distance A approx. A ;;;;;;;;; ;;;;; ;;;;; ;;;;; ;;;;; ;;;;;; ;;;;;; d M KE PN 25 see drawing kg VEGADIF

20 Product description Mounting bracket y View x holes ø 10.4 mm Installation instructions 85 x View y ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; ;;;;;;;; 105 ~195 ~ ,5 + Z S Z S ø Approvals For these applications the appropriate official documents (test reports, test certificates and conformity certificates) have to be noted. These are supplied with the appropriate instrument. Survey on the approvals which are in preparation or for which we applied Approval CENELEC CENELEC PTB-Zone 0 FM FM WHG EEx ia IIC EEx d IIC EEx ia IIC Explosion proof Intrinsically Type and non incentive safe VEGADIF 34 VEGADIF 35 VEGADIF 44 VEGADIF 45 VEGADIF VEGADIF 34 51

21 Mounting 2 Mounting 2.1 Verifying operating conditions VEGADIF is a rugged transmitter for precise differential pressure, level and flow measurement. The accuracy of the measurement mainly depends on the correct installation and the connection of the impulse lines. Detailed information for differential pressure measurement in aggressive products as well as further information on wiring and coordination of valves, measuring lines and components is given in the VDI/VDE-regulations 3512 as well as DIN and DIN Further information on level measurement is stated in the VDI/VDE-regulations The differential pressure transmitter used must meet the technical and safety requirements of the application. Therefore check from the type plate, calibration plate and order code the following data: Nominal pressure The pressure stage rating of VEGADIF must be above the operating pressure of the process. Measuring range The measuring range is calibrated (factory set) acc. to the order. The pressure values adjusted for zero and span are documented on the calibration plate. The values must cover the application. If an adaptation is necessary, this should be carried out acc. to section 4 Setup. Materials of wetted parts The material of the wetted parts must be sufficiently resistant. Use the respective material tables for control. A table is given in the product information to VEGADIF, for more information we recommend the VEGA-resistance lists. Ambient temperature The ambient temperature in the installation place must be in the range of -40 C +85 C. The surface temperature of the electronics housing must not exceed +85 C. Hence it should be noted that the electronics housing should not be heated to more than +85 C due to radiation by neighbouring instruments or systems. If temperatures below -40 C are expected at the installation, the transmitter should be installed in a temperature isolated and heated protection box. If there is danger that measured product or condensate freezes in the process connection or on the measuring cell, the transmitter must be installed in a warmer place or in a heated protection box for process connections and process seals. Similar measures should be taken to protect the impulse lines. Medium temperature The permissible medium temperature depends on the process seal, the measuring cell and the isolating liquid. When VEGADIF 45 or 51 are used, note that the product temperature can differ between plus and minus side. Moisture Mount horizontally installed instruments such that the cable entry points to the bottom to avoid moisture ingress. The sensor housing is therefore rotational by approx For vertically installed instruments loop the connection lines in a bow pointing to the bottom to the instrument housing, so that rain or condensation water can drain off the cable. This is mainly valid for mounting outside, in humid areas (e.g. by cleaning processes) or on cooled or heated vessels. VEGADIF

22 Mounting 2.2 Pre-installation Selection of the installation location The selection of a suitable installation location under extreme ambient conditions is needed for - quality of the measurement - a long lifetime of the transmitter - low maintenance expenses. Note the following regulations: Installation level For level measurements install below the minimum level (the diaphragm or the isolating diaphragm must be completely covered). For measurement of gases, install transmitter above the pressure tapping points. For the measurement of vapours and liquids, install transmitter below the pressure tapping points. Mounting locations Mount the transmitter as near as possible to the pressure tapping points. Keep impulse lines as short as possible. Mounting and maintenance work should be carried out without obstruction. The transmitter, the tapping points, the impulse lines and the valves should be easily accessible. If available, the mounting place should provide a good view to the LC-display. Adaptation of the transmitter For optimum adaptation of your VEGADIF to the installation place the following measures can be carried out: Rotate the electronics housing After loosening the locking screw below the electronics housing, the housing can be rotated by approx A stop prevents further turning. Hence the terminal compartment can be set to an optimum position for cable entry or the LC-display into an optimum reading position. Fig. 2.1 Loosen the locking screw When the best position is reached, tighten the locking screw again. Ambient influences Keep the vibration and shock effect to a minimum. Avoid corrosive ambient atmosphere. Reduce condensation to a minimum. Note: Under arduous ambient conditions, a protective housing is recommended. Fig. 2.2 Fastening of the locking screw 22 VEGADIF 34 51

23 Mounting Rotating the display If the integrated display is not correctly positioned it can be rotated in 90 -steps after opening the housing cover. Avoid exposure of the electronics compartment and carry out these measures if possible in a workshop. Note Do not turn more than 2 x 90 to the left or right, otherwise the connection cable may be damaged. 5 Insert the display into the clamp and snap-in 1 Unscrew the display cover 2 Push the protruding clamp with a screwdriver outwards 3 Tilt the display in this position and take out 6 Replace the outer cover Remove the protective plugs Transmitter or isolating diaphragm are provided with protective plastic plugs. Remove them before installation. 4 Rotate display as needed VEGADIF

24 Mounting 2.3 Mounting VEGADIF 34, 35 and 51 The differential pressure transmitter mounting is generally fixed. There are three versions with VEGADIF 34, 35 and 51: - pipe mounting (2 -pipe) - wall mounting - mounting on a valve block 1) Hanging the transmitter on the impulse lines is not recommended, nor with capillary lines. For correct mounting VEGA offers a universal mounting kit consisting of: - a mounting bracket - a pipe shackle for 2 -pipes (up to outer-ø 63 mm) - two hexagon nuts M8 with plain washers - four hexagon screws ( 7 / 16 UNF or M10 x 18 2) ) For easy removal of the transmitter a three or five valve manifold can be mounted to the transmitter 1). Pipe mounting Use the complete mounting kit and note the following procedure: 1 Hold the mounting bracket in the required direction on the pipe. 2 Insert the u-bolt via the pipe through the holes of the mounting bracket. 3 Screw two hexagon nuts to the u-bolt and fasten the bracket by fastening the nuts on the pipe. 4 Fasten the transmitter to the bracket (the screws with plain washers pass through the holes of the bracket into the thread). Mounting on vertical pipe approx. dimensions in mm ,5 In this case the valve block can be mounted with the mounting kit to a pipe or wall instead of the transmitter. The impulse lines can be sealed via valves and the manifold with the connected impulse lines can be left in place after removal of the transmitter Z S - + Z S - 1) not with VEGADIF 51 2) M12 x 18 with 420 bar-version of VEGADIF VEGADIF 34 51

25 + - Mounting Mounting on horizontal pipe Mounting with valve block 1) The valve block is fastened as described before by tube or wall mounting. Z S Procedure: 1 Fasten bracket to a tube or wall. 2 Screw the valve block to the mounting bracket with two hexagon screws and plain washers. The transmitter is normally flanged to the valve block just before setup of the measurement loop VEGADIF 44 and 45 Wall mounting Use the following material of the mounting kit: - bracket - four hexagon screws Provide the following material: - four screws with suitable plugs Note the following procedure: 1 Screw the bracket by means of the screws and suitable plugs to the wall. 2 Screw the transmitter to the bracket (the screws with plain washers pass via the holes of the bracket to the thread). The following instructions are given for VEGA- DIF 44 however are also valid for VEGADIF 45. Open vessel The minus side of the transmitter is open to atmospheric pressure. Therefore the open process connection of the minus side should point downwards. Max. Min. P atm Atmospheric pressure on the minus side of the transmitter 1) not with VEGADIF 51 VEGADIF

26 Mounting Closed vessel The minus side of the transmitter is connected via an impulse line with the vessel and feels the pressure. The pressure must be above the maximum level. The impulse line should have a block valve. Block valve Isolating diaphragm mounting on VEGADIF 51 The two isolating diaphragms connect the pressure transmitter with the process. The dimensions of the cell isolating diaphragm are dependent to the respective standard flange. The fastening is made by means of a suitable blind flange. Depending upon the flange a seal acc. to DIN 2690 or ANSI B 16.5 must be used. Mounting Blind flange Isolating diaphragm Seal Steam trap Measuring point connection flange Block valve Vessel wall If the static pressure is caused by steam above the product the minus side is connected via a condensation leg. Before opening the block valve the impulse line must be filled via the condensation pot. Level measurement Condensation pot ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; ;; Condensate Block valve Steam Max. Min. Recommended mounting Block valve Condensation outlet 26 VEGADIF 34 51

27 Mounting Only permitted with continuous positive pressures. Differential pressure measurement + - Flow measurement + - Avoid buildup on the isolating diaphragm of solids or by sticky materials. If possible position the flange connections on top of the pipe. VEGADIF

28 Electrical connection 3 Electrical connection 3.1 Connection instructions The electronics of the pressure transmitters requires a supply voltage of V DC. Supply voltage (DC voltage) and current signal are on the same two-wire connection cable to the terminals. This external supply can be provided via a separate instrument: - power supply (e.g VEGASTAB 690) - processing unit with integral DC voltage source (e.g. active DCS-input) - VEGAMET series 500 or 600 signal conditioning instrument, VEGALOG 571 processing system or VEGADIS 371 indication Note that the external supply source is reliably isolated acc. to DIN VDE 0106, part 101 from the mains circuits. The above mentioned systems meet these requirements and protection class III is therefore ensured. For electrical connection note the following instructions: - The connection must be made acc. to the specific national installation standards (e.g. in Germany acc. to the VDE-regulations). - The wiring between pressure transmitter and supply can be made by standard twowire cable. - If strong electromagnetic interference is expected, use screened cable. The screening must be earthed at the sensor end. - The connection cable for the external supply must never be connected to terminal 3 of the terminal block or to the test plug connection via terminal 1 of the terminal block (danger of damage to the electronics). - Housing cover and cable entry must be tight after electrical connection, so that humidity ingress to the terminal compartment is avoided. 3.2 Load resistance Various instruments can be connected to the signal output of the pressure transmitter, e.g.: - remote transmission systems - computers - indicating instruments - recorders - controllers etc. The total resistance of the connected instruments and the connection cable must not exceed the value of the max. load resistance. The load resistance consists of the line resistance R L, the adjustment resistance R X, and the resistance of the processing system and/or indicating instrument. This max. load resistance depends on the voltage of the external supply and can be calculated acc. to the following formula: U S U K R Lmax = I max R Lmax = max. load resistance 1) U S = supply voltage U Kl = terminal voltage I max = max. current (approx. 23 ma) The following load diagram is used for simplified determination of this value: in Ohm Load R total , , Supply voltage U S in Volts 28 VEGADIF 34 51

29 Electrical connection 3.3 Connections Electronics powered by the power supply unit Processing via an indicating instrument. Ammeter for local testing Transmitter terminals analogue / digital indicating instrument e.g. VEGADIS + R L U Kl U A U S 4 20 ma + ~ Voltage supply U S U A U KL R L = power supply = voltage loss in the indication instrument = terminal voltage (supply voltage) = resistance processing systems and connection cable (load resistance) Electronics powered by a VEGA-signal conditioning instrument or a PLC with active input circuit Processing is made via the PLC or the VEGAMET signal conditioning instrument. Ammeter for local testing Transmitter terminals or PLC active + 0/4 20 ma R L U Kl U S DISBUS 4 20 ma! Note: An ammeter for local testing of the output current can be connected between terminal 1 and its tag. This measurement can be made during operation without interrupting the supply line. VEGADIF

30 Electrical connection 3.4 Ex-applications Applications in Ex-areas require the use of approved instruments. For these applications the appropriate documents (test reports, test and conformity certificates) should be noted. These are supplied with the appropriate instrument. Therefore note the attached approval documents (yellow binder) and especially the attached safety data sheet. The voltage supply in Ex-applications must be only made via an intrinsically safe circuit. There are the following possibilities: - VEGAMET signal conditioning instrument in Ex-version - not certified signal conditioning instrument VEGAMET with VEGA-safety barrier type Ex-separator (e.g. VEGATRENN 149 Ex) - indicating and supply instrument VEGADIS 371 in Ex-version. The legal documents of these instruments must also be noted. Ex-application with supply via a VEGA non-ex-signal conditioning instrument with safety barrier type 145 The processing is made via the signal conditioning instrument in the non-ex-area Ex-area Terminals - VEGADIF U Kl Non-Ex-area Safety barrier type 145 VEGAMET in non-ex-version Note - Carry out the adjustment only with connected safety barrier (reason: the current consumption of approx. 300 µa is considered). - When connecting a VEGADIS 11 Ex the regulations for wiring of intrinsically safe circuits should be noted. Application with supply by Ex-separator, e.g. VEGATRENN 149 Ex The processing is made by an indicating instrument in the non-ex-area. Determination of the line length in the ia-iic-circuit The sum of the inner capacitances and inductances of the components must not exceed the max. permissible values of the ia-iiccircuit U Kl 3 Ex-area Terminals VEGADIF Non-Ex-area U S e.g. Ex-separator VEGATRENN 149 Ex - = ma ~ Example: ia-iic-circuit Pressure 1 pce. Line 1) max. total transmitter overv.arrester L int /C int L ext /C ext L int /C int L int /C int 0.5 mh 0.2 mh 0.13 mh 0.17 mh 56 nf 11.2 nf 1 nf 44.8 nf VEGADIS 11 Processing e.g. indicating instrument 1) Typical values for unshielded two-wire lines: L = mh/m; C = nf/m 30 VEGADIF 34 51

31 Electrical connection Calculation of L int /C int of the cable: L int (cable) = L ext (ia-iic-circuit) L int (pressure transmitter) L int (overvoltage arrester) = 0.5 mh 0.2 mh mh = 0.17 mh C int (cable) = C ext (ia-iic-circuit) C int (pressure transmitter) C int (overvoltage arrester) = 56 nf 11.2 nf - 1 nf = 44.8 nf Calculation of the cable length: 0.17 mh I = m = 262 m 0.65 µh 44.8 nf I = m = 373 m 120 pf * To be on the safe side, the cable length in this example should not exceed a value of 250 m. VEGADIF

32 Setup 4 Setup 4.1 Adjustment structure The differential pressure transmitters can be setup - with the PC and the VEGA-adjustment program VVO, - with the HART handheld or - with the integral 4-key adjustment elements. Adjustment program VVO With the adjustment program VVO (VEGA Visual Operating) on the PC you adjust the sensors in a very comfortable way. The PC communicates via the interface converter VEGACONNECT 2 with the sensor. The signal and supply line is therefore superimposed by a digital adjustment signal. The adjustment can be made in any position of the signal line, naturally also directly on the sensor. HART handheld Beside the PC and the 4-key adjustment elements, the sensors can be also adjusted with the HART handheld. 4-key adjustment elements with LCdisplay If you have neither a PC nor a HART handheld, the sensors can also be setup directly with the integral 4-key adjustment elements. 4.2 Adjustment with 4-key adjustment element LC-display in operating mode According to the ordered version your VEGA- DIF is provided with an integral LC-display. This display can be retrofitted or removed. The display is located below the upper housing cover behind a glass pane. The LC-display provides the following information in the adjustment mode: Span indication during full adjustment Zero indication during empty adjustment LC-display Position of zero s z Appropriate pressure value Bar graph for measuring span = span zero Position of span The following examples show possible indication values. Example 1: Meas. range bar, LCD in operating mode D p -0,5 bar Display I 4 ma 0 bar ma 1,5 bar ma 32 VEGADIF 34 51

33 Setup Example 2: Measuring range 0 10 bar D p Display I 0 bar ma If you have a VEGADIF without LC-display, connect to the terminal and to tag 1 an ammeter with measuring range 0 20 ma (e.g. digital multimeter). For the exact adjustment connect a precision ammeter. Push the keys with a small screwdriver. 2,5 bar 10 bar ma 20 ma The second adjustment element, the step switch, is located below the LC-display; therefore remove the display, as described under "2.2 Pre-installation. 4-key adjustment elements Your VEGADIF is provided with the following direct adjustment elements: - four adjustment keys - one step switch The adjustment keys are located below a slide laterally on the electronics housing. The slide is marked with z (zero) and s (span) and can be moved after loosening of the recessed head screws. When moving the slide, two adjustment keys are released, when then rotating the slide, all four adjustment keys are released. + Z - S ++ Z S - First of all the slide releases 2 keys and then all four keys Via these four keys in conjunction with the LCdisplay you can carry out the most important adjustments such as zero, span and bias pressure directly on the transmitter. The step switch below LC-display The adjustments on the step switch mean: - 0 Adjustment with PC or HART, therefore damping adjustable from 0 40 s - 2 Damping 0.5 s linear - 3 Damping 1.0 s linear - 4 Damping 2.0 s linear - 5 Damping 4.0 s linear - 6 Damping 8.0 s linear - 7 Damping 16.0 s linear - 8 Adjustment with PC or HART, therefore damping adjustable from 0 40 s - 9 Damping 0 s extracted by root - A Damping 0.5 s extracted by root - B Damping 1.0 s extracted by root - C Damping 2.0 s extracted by root - D Damping 4.0 s extracted by root - E Damping 8.0 s extracted by root - F Damping 16.0 s extracted by root Current I Current I Dp Dp/p linear extracted by root VEGADIF

34 Setup Display zero 1 Push +z or z key 2 Monitor the displayed value and release the key again. After approx. 2 s the indication resets automatically to operating mode. Example for display of zero: Meas. range -3 0 bar 0 1,5 bar z z Display Data of the factory setting Measuring range Your VEGADIF is calibrated acc. to the order. The calibration data is stated on the calibration plate, e.g mbar. For this measuring range: - The 4 ma-signal is coordinated to the first pressure value (in the example 0 mbar). - The 20 ma-signal is always coordinated to the second pressure value (in the example 1000 mbar). Check if the calibrated measuring range corresponds to the application and if necessary readjust, see the following section "Adjustment. 1) 2,5-0,5 bar z Integration time A factory set integration time of 0 s is supplied. Via the step switch this time can be changed from 0 16 s, with the PC to 0 40 s, to achieve an increased smoothing of the output signal. Display span 1 Push +s or s key 2 Monitor the displayed value for s and release the key again The display resets automatically to operating mode after approx. 2 s. Examples for display of span: Meas. range -3 0 bar s Display Output characteristics As factory setting a linear characteristics is adjusted. A square root output can be selected with the step switch. Electronics replacement The calibration data is stored in the EEPROMmemory of the electronics. Always check the data when replacing the electronics and modify if necessary. Adjustment 0 1,5 bar 1) 2,5-0,5 bar s First note the adjustment ranges for zero and span. The values are stated under "1.4 Technical data - Transmission reaction. Make sure that your requested values are within the possible adjustment range. 1) This adjustment effects an inversion of the current output 34 VEGADIF 34 51

35 Setup Two methods are available for adjustment - adjustment without pressure (dry) - adjustment with pressure (wet) The dry adjustment can be made before mounting in the workshop or after mounting at the measuring point. Note with the adjustment before mounting, that the position of the transmitter corresponds to the intended installation position. This is particularly necessary for VEGADIF 45 and 51 with isolating system or capillaries. Use for sensors without display a precision ammeter (class 0.03 or better) to adjust the current output. Adjustment without pressure (dry) Reduce zero 1 Push key z twice and hold. 2 Note the change of the current. 3 When the requested current value is reached, release z. 4 The display resets automatically to operating mode after approx. 2 s and the adjusted value is saved. Example: given: mbar, (z = 0 mbar, s = 1000 mbar) z to be changed to: z = -500 mbar Increase zero Push the key z+ twice and hold. The procedure is the same as above. Reduce span 1 Push key s twice and hold. 2 Note the change of the current. 3 When the requested current value is reached, release s. 4 The display resets automatically to operating mode after approx. 2 s and the adjusted value is saved. Example: given: mbar, (z = 0 mbar, s = 1000 mbar) to be changed to: s = 500 mbar Push the key s twice and hold until 500 mbar are adjusted. Adjustment with pressure (wet) For the adjustment with pressure, VEGADIF must be connected to a variable pressure source, e.g.: - a pressure calibrator - directly to the process Adjust zero with display 1) Set pressure precisely for zero (e.g. 0 bar) and check via the display. 2) Push key z+ and z together. The pressure (e.g. 0 bar) corresponds to the output current 4 ma. Adjust span with display 1) Set pressure precisely for span (e.g. 1 bar) and check via the display. 2) Push key s+ and s together. The pressure (e.g. 1 bar) corresponds to the output current 20 ma. Adjust zero without display 1) Set pressure precisely for zero (e.g. 0 bar) and check via an external pressure calibrator. 2) Push key z+ and z together. The pressure (e.g. 0 bar) corresponds to the output current 4 ma. VEGADIF

36 Setup Adjust span without display 1) Set pressure precisely for span (e.g. 1 bar) and check via an external pressure calibrator. 2) Push key s+ and s together. The pressure (e.g. 1 bar) corresponds to the output current 20 ma. Adjust zero/span without display however with current meter For adjustment a control instrument with measuring range ma is connected to terminal 1 and tag 1. 1) Set pressure precisely for zero (e.g. 0 bar) and check via an external pressure calibrator. 2) Adjust with keys z+ and z a current of 4 ma. The pressure (e.g. 0 bar) corresponds to an output current 4 ma. 3) Set pressure precisely for span (e.g. 1 bar) and check via an external pressure calibrator. 4) Adjust with the keys s+ and s a current of 20 ma. The pressure (e.g. 1 bar) corresponds to an output current 20 ma. Note: When only intermediate values are available for the reference pressures, the current to be adjusted can also be calculated: p p z I = 4 ma + 16 ma p s p z p = reference pressure p s = pressure at span p z = pressure at zero Example: Meas. range mbar Reference pressure span p s = 1000 mbar, zero p z = 0 mbar, reference pressure p = 250 ma (750 mbar) 250 mbar 0 mbar I z = 4 ma + 16 ma 1000 mbar 0 mbar I z = 8 ma 750 mbar 0 mbar I s = 4 ma + 16 ma 1000 mbar 0 mbar I s = 16 ma Bias pressure Bias pressure is the pressure indicated although a differential pressure of 0 mbar is present at the pressure tappings. The bias pressure is caused by unequal hydrostatic pressures 1) on the measuring cell. The following relation is valid: Pressure indication = Sensor pressure Bias pressure Example: Pressure indication: bar Sensor pressure: bar Bias pressure: bar bar = bar bar Note: - The adjustment of the bias pressure must be carried out before the adjustment of zero and end, as these values had been modified. - The adjustment of the bias pressure does not influence the current output. The signal current and its characteristics are not modified. 1) This can be caused e.g. by non-level pressure tappings and therefore different needs in the impulse lines, by the installation of the capillary lines or the position of the measuring cell itself (max. 2 mbar when tipped by 90 ). 36 VEGADIF 34 51

37 Setup Indicate bias pressure 1) Push keys z+ and s+ once together. 2) Adjusted bias pressure is indicated. 3) After approx. 2 s the display resets automatically to operating mode. Save/take over bias pressure 1) Push keys z+ and s+ twice together. The available pressure value is taken over as bias pressure. 2) After approx. 2 s the display resets automatically to operating mode and shows bar. Therefore the available pressure (0 bar) was taken over as bias pressure (correction value). Delete bias pressure 1) Push the keys z and s twice together. 2) After approx. 2 s the display resets automatically to operating mode and shows the value of the uncorrected bias pressure. Lock/unlock keys Lock 1) Push keys z+ and s once together. 2) "Prot = protected appears (locked). 3) After approx. 2 s the display resets automatically to operating mode. Unlock 1) Push keys z and s+ once together. 2) "Free = unlocked appears. 3) After approx. 2 s the display resets automatically to operating mode. Integration time and output characteristics An integration time of 0, 1, 2, 4, 8, 16 s can be adjusted via the step switch to smooth the output signal of your VEGADIF. The output characteristics for pressure, level and flow can be selected as line or square root. The integration time is the time required by the output to reach 63 % of the actual change after a step change of the differential pressure. After three times the adjusted integration time, the current output signal will have reached 95 % of the step change. Explanation: - an integration time of 0 s means tracking of the current output without additional delay - an integration time of 16 s means that the output has reached its final value only after more than one minute. Adjust the integration time and the output characteristics acc. to the table. All figures indicate the switch positions: Integration time Characteristics linear by root I ~ Dp I ~ ÖDp/Dp max. 0 s s 2 A 1 s 3 B 2 s 4 C 4 s 5 D 8 s 6 E 16 s 7 F I Dp I Dp The positions 0 and 8 enable the adjustment with PC (VVO) or with HART handheld by which you can also adjust the integration time of 0 40 s. VEGADIF

38 Setup 4.3 Adjustment with HART handheld Beside the adjustment with the 4-key adjustment element in the sensor and the adjustment with the PC and the adjustment software VVO a VEGADIF can be also operated with a HART handheld. If the inner resistance of the voltage supply is less than 250 W, a resistor of R X = 250 W 1 / 4 W must be looped into the signal/connection line during adjustment. The digital adjustment and communication signals would be shortcircuited via too small resistances of the supply current source or the processing system so that the sensor communication would not be assured. Electronics powered by PLC with active input circuit + PLC - Ri > PLC Ri < VEGADIF 34 51

39 Setup Electronics powered by power supply unit Ammeter for local testing Transmitter terminals analogue / digital indicating instrument + U Kl U A U S 4 20 ma U K R X - + ~ Supply voltage (Ri < 250 W) Note: An ammeter for local testing of the output current can be connected between terminal 1 and its tag. This measurement can be made during operation without interrupting the supply line. Electronics powered by a VEGA-signal conditioning instrument Ammeter for local testing Transmitter terminals + 0/4 20 ma U U K Kl U S DISBUS 4 20 ma R X! If the differential pressure transmitters are operated on a VEGA-signal conditioning instrument, you have to connect the sensor via a resistor acc. to the following schedule to the signal conditioning instrument during the HART adjustment. Together with the inner resistor of the signal conditioning instrument, the resistance value of 250 W required for the HART instrument is reached. If the resistor of the processing system or the voltage supply is more than 250 W, there is no "Adjustment resistor required. VEGADIF

40 Setup + PLC - Ri > 250 VEGAMET VEGALOG Rx VEGA-signal conditioning instr. VEGAMET 513, 514, 515, 602 VEGATRENN 544 VEGATOR VEGAMET 614 VEGADIS 371 VEGAMET 601 VEGASEL 643 VEGAMET 513 S4, 514 S4 515 S4, VEGALOG EA-card R X Ohm no additional resistance required Ohm Ohm Ohm 40 VEGADIF 34 51

41 Setup The most important adjustment steps On the following two pages you see the HART -menu plan to differential pressure transmitter VEGADIF. The most important adjustment steps are marked in the menu plan with the figures A F. Setup the sensor in the sequence A F. A: Empty adjustment without medium (zero dry) B: Full adjustment without medium (span dry) D: BIAS PRESSURE AUTOM. Means that the indication can be set to zero, to suppress a certain pressure in the indication. The output characteristics and the signal current are not concerned. E: Damping of the signal output. The pressures on the measuring cell are integrated and averaged in the given times, to get a stable indication and signal current output even in case of quick pressure fluctuations. F: Selection of the physical unit A1: Empty adjustment with medium (zero) B1: Full adjustment with medium (span) C: LOW/HIGH SENSOR CAL. (only if required, see following diagram) Here the proportionality defined by the empty and full adjustment between pressure and signal current (characteristics) can be shifted in the position (vertically). The characteristics can be quasi hold or shifted in the range of the zero point or the range of the measuring range final value (see right diagram), to get a requested signal current in the zero point or at the measurement end. Adjustment characteristics (e.g mbar) after LOW/HIGH SENSOR CAL. was carried out (point C) ma HIGH SENSOR CAL. span Adjustment characteristics (e.g mbar) after empty/full adjustment LOW SENSOR CAL. zero mbar mbar VEGADIF

42 Setup HART menu plan VEGADIF Switch on: Hart Communicator Self Test in Progress Firmware Rev: F2.2 Module Rev: FRSI after approx. 20 s Online (Generic) 1 Device setup 2 PV mbar 3 PV AO mbar 4 PV LRV mbar 5 URV mbar HELP SEND Setup the sensor in the sequence of the letters A, B, C and D (dry adjustment: adjustment without medium). For the adjustment with medium, setup the sensor in the sequence A1, B1, C and D Device setup 1 Process variables 2 Diag/Service 3 Basic setup 4 Detailed setup 5 Review SAVE HOME PV mbar HELP A ma HELP EXIT EXIT Process variables 1 Snsr mbar 2 AI % rnge AO HELP SAVE HOME 1 PV LRV mbar 2 URV mbar HELP HOME WARNING Return control loopo to automatic control OK WARNING Pressing ÒK`will change device output. Put loop in manual. ABORT OK 1 PV LRV mbar 2 URV mbar Dry adjustment: Empty and full adjustment without medium (with medium see next page) 1 PV LRV mbar 2 URV mbar 4 A HELP SEND HOME PV LRV mbar mbar 4.1 (5.1) Important menu windows HELP HOME 1 PV LRV mbar 2 URV mbar 5 B HELP DEL ESC ENTER Empty adjustment without medium 4.2 (5.2) PV URV mbar mbar Less important menu windows HELP HOME HELP DEL ESC ENTER Full adjustment without medium continue as under A (figure 4.1 or 5.1) 42 VEGADIF 34 51

43 Setup PV mbar HELP PV % rnge % HELP AO ma EXIT EXIT Safety enquiry Acknowledgement Choose analog output level 1 4 ma 2 20 ma 3 Other 4 End ABORT ENTER Calibration 1 Apply values 2 Enter values HELP SEND HOME D Tag LEV 34 Simulation: Output of individual current values for test purposes A1 B1 Wet adjustment: Empty and full adjustment with medium (see next page) New measurement loop designation to save with ENTER and SEND HELP Diag/Service 1 Test device 2 Loop test 3 Calibration 4 D/A trim HELP SAVE HOME Basic setup 1 Tag 2 PV Unit 3 Range values 4 Device information 5 PV Xfer fnctn HELP SAVE HOME 6 PV Damping Dateiled setup 1 Sensors 2 Signal condition 3 Output condition 4 Device information SAVE HOME EXIT Correction possibility of the digital/analogue converter in conjunction with a prevision ammeter as reference instrument (only for service purposes). Transmission function (linear) Adjustment of the integration time C Sensors 1 PV mbar 2 PV Snsr unit 3 Sensor information HELP SAVE HOME Signal condition 1 Snsr Damp 0.000s 2 URV mbar 3 AI LRV mbar 4 Xfer fnctn Linear 5 AI % rnge % HELP SAVE HOME HELP DEL ESC ENTER PV Snsr unit mbar mbar g/sqcm kg/sqcm Pa ESC ENTER Range values 1 PV LRV mbar 2 URV mbar } 3 LSL mbar 4 USL mbar HELP Device information 1 Distributor 2 Model 3 Dev id 4 Tag 5 Date **/**/** HELP SAVE HOME 6 Schreibgeschützt 7 Beschreibung 8 Nachricht 9 PV Sens. Seriennr. Werknummer Revisionsnummer HOME Display of the used measuring range } Display of measuring range Measured value Change measuring unit Info on lower and upper measuring range limit as well as the min. span (also the sensor characteristics values) Adjustment of the integration time Adjustment of zero and span Adjustment of zero and span linear Display of the level in % of the adjusted span as menu see next page VEGADIF

44 Setup Continuation HART menu plan VEGADIF Calibration 1 Apply values 2 Enter values HELP SAVE HOME Safety enquiry Acknowledge Wet adjustment Set the: 1 4mA 2 20mA 3 Exit ABORT ENTER Empty adjustment with medium Apply new 4ma input ABORT OK Full adjustment with medium Apply new 20ma input ABORT OK Dry adjustment Enter values 1 PV LRV mbar 2 URV mbar 3 PV USL 4 PV LSL HELP HOME } Empty adjustment without medium (as menu 4.1 or 4.2 on previous page) Display of the measuring range Full adjustment without medium Analog output 1 AO ma 2 AO Alrm typ Hi 3 Loop test 4 D/A trim 5 Skaled D/A trim HELP SAVE HOME AO Alrm typ Hi } EXIT WARNING Loop should be removed from automatic control ABORT OK ENTER Correction possibility of the digital/analogue converter in conjunction with a precision ammeter as reference instrument (only for service purposes) Low: In case of failure current output goes to 22 ma High: In case of failure current output goes to < 3.6 ma Choose analog output level 1 4 ma 2 20 ma 3 Other 4 End ABORT Set signal current for test purposes to a certain value. from menu window 1.4. menu point 3 Condition output Output condition 1 Analog output 2 HART output SAVE HOME HART output 1 Poll addr 2 Num req preams 0 3 Burst mode Off 4 Burst option HELP SAVE HOME 44 VEGADIF 34 51

45 Setup A1 B Current applied Process value: mbar 1 Set as 4mA value 2 Read new value 3 Leave as found ABORT ENTER Current applied process value: mbar 1 Set as 4mA value 2 Read new value 3 Leave as found ABORT ENTER A PV LRV mbar mbar HELP DEL ESC ENTER Set the: 1 4 ma 2 20 ma 3 Exit ENTER ABORT Set the: 1 4 ma 2 20 ma 3 Exit Quit the menu with 3 Quit Quit the menu with 3 Quit ABORT ENTER Enter values 1 PV LRV mbar 2 URV mbar 3 PV USL 4 PV LSL HELP SEND HOME Continue as in menu 4.1 on previous page B PV LRV mbar mbar Enter values 1 PV LRV mbar 2 URV mbar 3 PV USL 4 PV LSL Continue as in menu 4.2 on previous page HELP DEL ESC ENTER HELP SEND HOME Poll addr HELP DEL ESC ENTER Multidrop operation The sensor provides the measured value also digitally in the HART-protocol beside the 4 20 ma signal. Poll address zero: The sensor takes a level dependent 4 20 ma current and delivers the level simultaneously as digital HART-signal. Poll address 1 15: The output signal is only available as digital HART-signal (HART-signal). The 4 20 ma signal is no longer provided, and the sensor current is fixed adjusted to 4 ma. Burst mode Off Off On Not Used None ESC Unknown Spcl ENTER Sensor signals measured values only upon request of the master Sensor signals the measured value selected in Burst Option without master enquiry Choice is not supported Burst option Selection of the unit for the measured value provided digitally without master or host PV enquiry: % range/current - as process variable (e.g. mbar) Process vars/crnt - as percentage value or - as signal current. HELP ESC ENTER VEGADIF

46 Setup 4.4 Adjustment with PC ma 1) PLC 2 VEGA- CONNECT 2 2 1) If the inner resistance of the power supply or the processing system (PLC) is less than 200 W, a resistor of 200 W to 350 W must be switched into the connection cable during adjustment. The digital adjustment signal would be extremely damped or shortcircuited via too small input resistors so that the digital communication with the PC would no more be ensured. For connection of the PC to the pressure transmitter, you require the interface converter VEGA- CONNECT 2. Connection of the PC Insert the VEGACONNECT into the standard connection of the PC and connect the two-wire line of VEGACONNECT to the pressure transmitter or the signal/supply line of the pressure transmitter. Before starting the setup: Do not be confused by the many figures, adjustment steps and menus on the following pages. Just carry out the setup with the PC step by step and soon you will no more require the following pages. When you have connected the PC with the adjustment software to your measuring system, first switch on the power supply of the pressure transmitter. switch on the PC and start the adjustment software VVO. in the initial screen you choose with the arrow keys or with the mouse the point "Planning and click to "OK. You are asked for the identification. Enter under name "VEGA. Also enter under password "VEGA. The adjustment program VEGA Visual Operating (VVO), in the following just called VVO, gets in direct contact with the connected sensor 46 VEGADIF 34 51

47 Setup In the menu "Modify meas. loop configuration you can coordinate to the measurement loop instead of the sensor number first of all a name (e.g. Tank 10) and a measurement loop designation (e.g. cleaning detergent). and shows you after a few seconds if, with which sensor and where a connection exists. Note: When connecting the adjustment software (VVO) to a sensor of which data had been already saved, you will get the information if the requested data should be transferred to the sensor or if you want to transfer the sensor data to the database of the VVO (and are therefore overwritten). Configuration Click in the main menu window to the menu "Configuration/Measurement loop/modify. This is the first step for the setup of the sensor. Confirm the adjustment with "OK and after saving you are again in the main menu window. Adjustment In the menu "Instrument data/parameter adjustment you now carry out all important sensor adjustments. Choose the menu "Instrument data/parameter adjustment. VEGADIF

48 Setup Confirm the warning with "OK. In the heading you see the previously entered measurement loop name and description. Now choose in the menu window "Instrument data parameter adjustment the menu point "Adjustment. Click in the menu window "Adjustment to "zero/span. In the example this is a pressure transmitter with a measuring range of mbar, by which negative pressures (partly evacuation) are measured. The min. value was adjusted to -80 mbar and the max. value (span) to 80 mbar (i.e. meas. range end). Confirm your adjustment with "OK and after a short data transmission to the sensor you are again in the menu window "Adjustment. Quit all menu windows with "Quit and you are again in the initial menu. You can carry out the min/max. adjustment with medium or without medium. When you want to carry out the adjustment with medium, you have to carry out the min. adjustment with emptied vessel and the max. adjustment with filled vessel. It is therefore comfortable and quick to carry out the adjustment without medium as shown in the example. Choose in which unit you want to carry out the adjustment. Enter the pressures which should correspond in your application to 0 % and 100 % and push "OK. Offset correction If the indication does not show zero at zero pressure after the adjustment of the meas. begin, it can be corrected to zero (position adjustment). Here the proportionality between pressure and signal current (characteristics) defined by the empty and full adjustment can be shifted in the position (vertically). The characteristics can be quasi hold and shifted in the range of the zero point. This corresponds e.g. to the menu "LOW SENSOR CALIBRATION in the HART menu. 48 VEGADIF 34 51

49 Setup Choose in the initial menu "Instrument data/ Parameter adjustment the point "Additional functions. Click to "Correct. Click to "Offset correction. When the sensor is unpressurized and in installation position, confirm the safety enquiry with "OK. The sensor value is now correctly provided with 0.0 bar. Also compare the diagram under "4.3 Setup with HART handheld. Linearisation In the menu "Instrument data/parameter adjustment/conditioning/linearisation you coordinate a volume to the level. The relation of level and volume is described in so called linearisation curves. You see the current sensor value and the measuring cell pressure where the last correction was carried out. Click to "Instrument data/parameter adjustment, then to "Conditioning and finally to "Linearisation. VEGADIF

50 Setup First of all a linear relation is displayed (the function is a straight line). In the field "Transfer measured value the actual pressure in percent of the adjusted span is displayed. You have adjusted the span with the min./max. adjustment. In our example this is in the range of mbar. The user programmable curve is generated by index markers consisting of the value pairs "Linearised (volume in percent or in the selected unit) and "Percentage value (level in percent). Gauging by liters You can choose four linearisation curves: linear, cylindrical tank, spherical tank and user programmable curve. Under "User programmable curve you can enter an own linearisation curve as relation between level in percent or pressure in percent (percentage value) and the volume (linearised). Therefore choose "User programmable curve and then "Edit. In the characteristics of the example (evacuated vessel) you see four index markers or value pairs. There is always a linear interpolation between the index markers. Click to "Show scaled values, to have the adjusted meas. unit displayed on the y-axis (bottom left in the menu window). Index marker 1 is at 0 % level or pressure (percentage value [%]) corresponding to an actual pressure of 0 mbar. Note! When you want to enter an own linearisation curve, you have to enter two or more index markers, otherwise the transmitter will fail. 50 VEGADIF 34 51

51 Setup Index marker 2 is at 30 % level or pressure and 5 % volume. Index marker 3 is at 70 % level or pressure and 35 % volume. Again in the menu window "Conditioning you can enter with the menu point "Integration time a measured value integration. This is useful for fluctuating product surfaces to compensate a permanently changing measured value indication and output. As a standard feature an integration time of 0 seconds is adjusted. Quit the menu with "OK. You are again in the menu window "Instrument data parameter adjustment. Index marker 4 is at 100 % level or pressure and 100 % volume (100 liters). Vacuum Saline solution 1000 mbar = 100 liters 700 mbar = 35 liters 300 mbar = 5 liters Measurement loop data Click in the menu window "Instrument data parameter adjustment to "Meas. Loop Data. VEGADIF 0 mbar = 0 liters You can enter max. 32 index markers (value pairs). Quit the menu with "OK. Confirm the message with "OK and your individual linearisation curve will be saved in the sensor. You get all sensor information. With the point "reset you delete the pressure and temperature history which is saved in the sensor. VEGADIF

52 Setup Outputs Click in the menu window "Instrument data parameter adjustment to "Outputs and then in the menu window "Outputs to "Current output. The menu window "Conditioning opens. Click to "Scaling. The menu window "Current output opens. Choose here the reaction of the signal current in case of failure (22 ma or no change). With "no change the transmitter keeps in case of failure the actual current value and does not go to the failure current of 22 ma. Conditioning Click to "Instrument data/parameter adjustment/conditioning. In the menu window "Scaling you choose the figure and the physical unit to be displayed (if available) of the transmitter. Display of measured value and back-up See manual "VEGA Visual Operating (VVO). Simulation In the menu window "Simulation of outputs you can simulate the filling of the vessel or the signal current. You therefore set the indication and the signal current to the requested value. For further information see Manual VEGA Visual Operating. 52 VEGADIF 34 51

53 Installation connections 5 Typical installation connections 5.1 Valves For VEGADIF 34 and 35 the use of three or fivefold valve blocks which can be directly flanged to the transmitter are recommended. These offer the following advantages: - Mounting and dismounting of the transmitter are possible without interrupting the process. - For the fivefold valve block two valves for vent drain are provided. Typical valve connections with the threefold valve block (standard connection) For impulse lines a block valve each should be provided at the pressure tapping point. The threefold valve block includes two inlet valves and one equalization valve. The two inlet valves are used to isolate the measuring cell from the impulse lines. Typical valve connections for a five valve block (connection also in liquids) For each impulse line a block valve should be provided at the pressure tapping point. The five valve block includes two inlet valves and one equalization valve as well as in addition two blow down valves. This connection is also suitable for aggressive liquids. The two inlet valves are used to isolate the measuring cell against the impulse lines. The equalization valve is used for zero-point adjustment of the transmitter especially in the flow and level measurement. Two additional valves are used for drain-off in the impulse lines. For draining observe the following procedure: 1 Close inlet valves 2 Open blow down valves In this way the impulse lines are cleaned throughout. The equalization valve is used for zero-point adjustment of the transmitter especially in flow and level measurement. from the pressure tappings from the pressure tappings Block valves Block valves Three valve block Five valve block Inlet valves Inlet valves to the transmitter Equalization valve to the transmitter to outlet Blow down valves Equalization valve VEGADIF

54 Installation connections 5.2 Impulse lines The impulse lines are used for pressure transmission from the pressure tappings to the transmitter. The following regulations must be observed for running the impulse lines so that the measured pressure reaches the sensor unaltered: - Lines with 12 x 1.5 mm or more should be used (see e.g. DIN , impulse lines for flow measuring systems). - The line material must be corrosion resistant, suitable for the measured product. - The impulse lines must be as short as possible and must be earthed; avoid bending. - The impulse lines must have a gradient of at least 10 % (10 cm per meter); preventing buildup. - Ensure that the whole measurement system (transmitter, high and low side impulse lines etc.) is installed in the same aggregate condition, even temperature conditions. - Both impulse lines should be at the same temperature (differential pressure measurement depends on the density); hence the impulse lines must be routed close together; if necessary isolate or couple thermally. - If necessary the impulse lines should be fastened with pipe clamps. - It is recommended to connect the impulse lines via multiple valve blocks to the transmitter; this ensures simple mounting and dismounting of the transmitter without interruption of the process. Connection of the impulse lines The impulse lines must be cleaned before connecting to the transmitter: - In applications with gases blow through with compressed air. - In applications with liquids use a suitable cleaning liquid. Contamination such as e.g. welding or pickling residues must not penetrate the process flanges (causing errors). Before connecting the transmitter, the impulse lines to the block valves or valve block must be tested for leaks. The impulse line with the higher pressure must be connected to the plus side of the transmitter, the impulse line with the lower pressure to the minus side of the transmitter. Connection of impulse lines direct to the transmitter In this case the following connection options exist: - with cutting ring threading (non-soldered taper-bush) to the 1 / 4 NPT, 1 / 2 NPT or R C 1 / 4 NPT female threads of the process connection to the transmitter. - with separate oval flange adapter to the 1 / 2 -female thread. Connection of impulse lines to the valve block The impulse lines are connected with cutting ring threading (non-soldered taper-bush) to the 1 / 4-18 NPT female thread of the valve block. 54 VEGADIF 34 51

55 Installation connections Connection of the transmitter to the valve block The connection of the transmitter is normally made just before commissioning. Generally seal rings made of PTFE as well as four screws are supplied with the valve block. The seal is made on both process connections of VEGADIF. Procedure: 1 Push both seal rings into the grooves of the valve block (it is always recommended that two new PTFE-seals are used for any new transmitter installation). 2 Locate the transmitter with the four screws carefully to the valve block. 3 Tighten the screws crosswise (recommended torque 6-8 Nm). 5.3 Differential pressure measurement Installation connection for liquids If the pressure of a flowing material is to be measured in a pipe, the pressure tappings must be located where there is steady flow. The impulse lines must be installed with continuous gradient ³ 1 : 10 (i.e. 10 cm per meter). The recommended installation position of the transmitter is below the pressure tappings. For products with solids content the pressure tappings must be taken from above the pipe Inlet valves 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Ventilation screw For differential pressure measurements referred to atmosphere, the impulse line must be connected to the plus side of the transmitter. The minus side remains open to atmosphere. In case of extremely dirty atmospheres it is recommended to use a filter at the minus side or an open tube bent down. This protects the minus side from blockage. VEGADIF

56 Installation connections For this connection the height difference "h between tapping point and measuring cell centre must be considered for adjustment of zero and span (the liquid column acts only on the plus side of the measuring cell) h Installation connection for gases For the measurement of gases the transmitter should preferably be positioned above the pressure tapping. The impulse line must be connected to the plus side of the transmitter. The minus side remains open to atmosphere. In very dirty atmosphere the use of a filter on the minus side or an open tube bent down are recommended. This protects the minus side against blockage. The impulse line must be run with continuous incline so that condensation can drain automatically. If a gas contains impurities, special pressure tapping sockets must be used. 1 Inlet valves 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 3 If the transmitter is mounted above the pressure tapping the vent or drain valves on the process flanges should be rotated. The impulse line gets an additional vent valve Inlet valves 2 Transmitter 3 Vent and drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 1 1 Inlet valve 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 7 Vent valve (impulse line) 5 4 If due to constructional reasons mounting of the transmitter below the pressure tapping is required, a separator for impurities as well as a blow down valve must be installed in the lowest position of the impulse line. 56 VEGADIF 34 51

57 Installation connections 5.4 Level measurement Installation connection for open vessels For an open vessel the level is measured from the hydrostatic pressure. "Open vessel" means all vessels where there is an atmospheric pressure above the liquid. 1 Inlet valves 2 Transmitter 3 Vent and drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 7 Separator for impurities 8 Blow down valves Note The described connections are recommended installations. For other installation connections different VDE-/VDI-regulations or DIN-standards (e.g. VDE/VDI 3512) give additional installation instructions. Special instructions for VEGADIF VEGADIF takes the hydrostatic pressure on the plus side via a flange diaphragm, via an impulse line or an isolating diaphragm. The atmospheric pressure is taken via the minus side. The hydrostatic pressure corresponds to the level measured from the centre of the impulse line multiplied by the specific gravity of the product and the acceleration due to gravity. As the atmospheric pressure acts on the plus side as well as on the minus side of VEGADIF, it is compensated with the differential pressure generation. Dp = p hydr = r g h Dp, p hydr : hydrostatic pressure [Pa] r: Density [kg/m 3 ] g: Acceleration due to gravity [m/sec 2 ) h: Level [m] + - For mounting to horizontal pipelines buildup on the isolating diaphragm by sticky products should be avoided. Therefore it is recommended to install the flange connection on top of the pipeline. VEGADIF

58 Installation connections VEGADIF 34, 35 The transmitter should be preferably installed at the height of the planned pressure tapping. If a location below the pressure tapping is made, the height difference "h for adjustment of zero and span must be included (the liquid column in the impulse line is seen as additional level. max. VEGADIF 44, 45 The transmitter must be mounted on the vessel such that the isolating diaphragm is completely covered by the fill fluid even at min. level. If a transmitter location below the min. level is selected, the height difference must be included with the adjustment of zero and span (the liquid column in the pressure line influences the output). In case of very dirty atmosphere the use of a filter on the minus side is recommended. This protects the minus side against blockage. 2 3 min. Example VEGADIF 44: Transmitter directly flanged h Differential pressure transmitter 2 Vent or drain valves 3 Block valve h = h 1 h 2 Dp h = r g h 1 If in special cases a location above the pressure tapping is necessary, only the liquid, above the centre of the measuring cell is measured. h 2 With this connection, gas pockets can influence the output. Impulse line and measuring cell must therefore be vented regularly. Example VEGADIF 45: Transmitter flanged via maintenance valve In both cases the minus side remains open to atmosphere. In case of very dirty atmospheres the use of filters on the minus side or an open tube bent down is recommended. This avoids blockages on the minus side. h = h 1 h 2 Dp h = r g h 1 h 2 1 Transmitter 2 Block valve 3 Emptying valve 58 VEGADIF 34 51

59 Installation connections This installation has the advantage that zero and span can be checked/modified without emptying the vessel. Valve 3 enables the necessary venting/emptying of the mounting socket. Installation for closed vessels In a closed vessel with static pressure, the level of a fill fluid is determined via the measurement of the hydrostatic pressure. On the bottom of the vessel, the sum of hydrostatic pressure and static pressure acts as total pressure. The hydrostatic pressure is therefore the difference between the total pressure and the static pressure. The hydrostatic pressure corresponds to the level of the measured product measured from the centre of the flange isolating diaphragm, multiplied by the specific gravity of the products (as the static pressure acts on the plus side as well as on the minus side of the transmitter, it is compensated with the differential pressure generation). Dp = r g h Dp: hydrostatic pressure [N/m 2 ] r : density of the fill fluid [kg/m 3 ] g: acceleration due to gravity [m/sec 2 ] h: level [m] With this installation a blow down valve and a separator for impurities is recommended for the impulse line. This measure is not necessary when the product is pure and no dirt or sludge is expected in the pipes. VEGADIF 34, 35 Standard installation connection The transmitter should be preferably installed at the height of the planned pressure tapping. If installation below the lower pressure tapping is planned, the height difference "h caused in the measuring cell centre must be included in the adjustment of zero and span Inlet valves 2 Equalization valves 3 Transmitter 4 Vent and drain valves 5 Blow-down valves 6 Separator for impurities 7 Block valves Note: - Unlike single input pressure transmitters the choice of the differential pressure transmitter is only made according to the expected pressure difference. The static pressure need to be considered provided the permissible nominal pressure is not exceeded. Hence the selected measuring range can be adapted to the expected pressure difference. - The described connections are recommended installation connections. For other installation arrangements different VDE/VDIregulations or DIN-standard (e.g.. VDE/VDI 3512) give further installation instructions. h 7 7 max. min. VEGADIF

60 Installation connections Installation connections for closed vessels with steam pressure 9 In a closed vessel with static steam pressure the sum of the steam pressure and the hydrostatic pressure acts on the bottom of the vessel as total pressure. This total pressure is fed to the plus side of the transmitter. In a separate vessel a fixed level is generated by condensate. This condensate column transmits the steam pressure to the minus side of the transmitter and protects the measuring cell from hot steam The following must be noted: - The impulse line from the condensate pot to the vessel must be run with a slight gradient to the vessel, so that excess condensate returns to the vessel and the level in the condensate pot remains constant. - Block valve "7 between vessel and condensate pot must not impede the steam outlet to the condensate pot; the installation must prevent water pockets occurring in the valve. - With insufficient condensate in the condensate pot additional condensate must be added via the dosing valve "9. - If the medium has a density other than the condensate column (1.0 g/cm 3 ), this must be included for adjustment of span. For this installation a blow down valve and a separator for impurities is recommended for each impulse line. This measure is not necessary when the product is pure and no dirt or sludge is expected in the pipeline. 1 Inlet valves 2 Equalization valve 3 Transmitter 4 Vent or drain valves 5 Blow down valves 6 Separator for impurities 7 Block valves 8 Adjustment pot 9 Dosing valve The differential pressure is detected as follows by the transmitter: D P = p F + p D (p k + p D ) D P = p F p k D P : Differential pressure p F : Hydrostatic pressure of the liquid column p D : Static pressure of the steam p k : Hydrostatic pressure of the condensate column (constant) The zero is determined as a negative differential pressure p F p k VEGADIF 34 51

61 Installation connections Installation connections for closed vessels with static steam pressure and heated comparative column This installation is a version of that previously described. However the condensate column is covered by a tube with larger nominal diameter which is filled with the measured product as a communicating pipe. Due to temperature equalisation there is the same density for both columns. The outer pipe must be therefore isolated - however not the adjustment pot (the condensate heat must be dissipated). The installation is preferred for measuring substances with higher density as more precise output is obtained. For this installation the same previously described technical conditions are valid. The VDE/VDI-regulation 3512 or different DINstandards give more detailed information: - Piping and connection of throttles and impulse lines. - Choice of components for aggressive products. VEGADIF 44, 45 The transmitter must be mounted to the vessel such that the isolating diaphragm is even at min. level completely covered by the fill fluid. The nozzle for the total pressure can be at the bottom of the vessel or at a defined height. The pressure tapping for the static pressure must be above the max. level. The nozzle is connected to the plus side, the top to the minus side of the transmitter. The transmitter takes the total pressure on the plus side via the flange isolating diaphragm, the static pressure on the minus side via the impulse line and the process connection. Standard connection Example VEGADIF 45: Transmitter directly flanged 2 ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;; ;;;; ;;;;;;;;; ;;;; 6 6 ;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; ;;; ;;; Dp h = r g h 2 h 1 ;;;; ;;;;;;;; ;; ;;; ;;;; ;; ;;; ;; ;; ;; ;;; ;; 5 ;;;; ;;;;;; Transmitter 2 Block valve 3 Separator for impurities 4 Blow down valve 5 Vent or drain valve Inlet valves 2 Equalization valves 3 Transmitter 4 Vent or drain valves 5 Block valves 6 Blow down valves 7 Separator for impurities 4 VEGADIF

62 Installation connections Example VEGADIF 45: Transmitter flanged via maintenance valve Transmitter 2 Block valve 3 Separator for impurities 4 Blow down valve 5 Emptying valve 5 This connection has the advantage that zero and span can be checked (modified) without emptying the vessel. The valves 5 and 6 enable the necessary venting/emptying of the socket. Installation connections for closed vessels with static steam pressure In a closed vessel with steam pressure the product level is determined via the measurement of the hydrostatic pressure. The sum of steam pressure and hydrostatic pressure acts as total pressure on the bottom of the vessel. The hydrostatic pressure is therefore the difference between total pressure and static steam pressure. 2 Dp h = r g h 2 h 1 The following must be noted: - The impulse line from the adjustment pot to the vessel must be run with a slight gradient to the vessel; excess condensate returns to the vessel, the level in the adjustment pot remains constant. - Block valve "2" between vessel and adjustment pot must not impede the steam line to the adjustment pot; the installation must be such that no water pocket is created in the valve. - With insufficient condensate in the adjustment pot, liquid must be added constantly in small quantities as additional condensate via dosing valve "6". - If the reference liquid has a different density to the condensate column (1.0 g/cm 3 ), adjustment of span has to be checked. For this installation connection a blow down valve and a separator for impurities is recommended. This measure is not necessary when the product is pure and no sludge is expected in the pipes. Note: For this installation connection a measuring cell must be used allowing a reduction of the zero point up to -100 % of the measuring range. Example VEGADIF 45: Transmitter directly flanged 1) The transmitter feels the total pressure on the plus side via the isolating diaphragm, the static pressure on the minus side via the impulse line. In a separate adjustment pot a fixed level is generated by condensation. This condensate column transmits the steam pressure to the minus side of the transmitter and protects the measuring cell against hot steam Dp h = 1 r g h h 2 1 Transmitter 2 Block valve 3 Adjustment pot 4 Separator for impurities 5 Blow down valve 6 Dosing valve 7 Vent or drain valve 62 VEGADIF 34 51

63 Installation connections The differential pressure is determined by the transmitter as follows: Example VEGADIF 45: Transmitter directly flanged D P = p F + p D (p k + p D ) 4 D P = p F p k 3 2 D P : Differential pressure p F : Hydrostatic pressure of the liquid column p D : Static pressure of the steam p k : Hydrostatic pressure of the condensate column (constant) 2 Dp h = r g 5 1 The zero is determined from p F p k. Installation connections for closed vessels with steam pressure and heated reference leg This installation connection is as previously described. However the condensate column is covered by a pipe with larger nominal diameter which is filled with the measured product in a communicating pipe. Due to temperature equalization there is the same density for both columns. The outer pipe must be insulated but not the adjustment pot (the condensate heat must be dissipated). This installation connection is preferred for measuring substances with higher density, to produce precise outputs. For this installation connection the same technical conditions are valid as above. 1 Transmitter 2 Block valve 3 Adjustment pot 4 Dosing valve 5 Vent or drain valve VEGADIF 51 Installation connection for closed vessels with static pressure In a closed vessel with static pressure, the level of a product is determined via the measurement of the hydrostatic pressure. The sum of the hydrostatic pressure and the static pressure acts as total pressure on the bottom. The hydrostatic pressure is therefore the difference between total pressure and static pressure. The transmitter feels on the plus side the total pressure via the isolating diaphragm and on the minus side the static pressure. The isolating diaphragm must be mounted such on the vessel that the isolating diaphragm is completely covered by the product even at min. level. 1) The transmitter can be mounted as shown or via a maintenance valve. VEGADIF

64 Installation connections The hydrostatic pressure corresponds to the level of the product measured from the centre of the flange isolating diaphragm, multiplied with the specific gravity of the product (as the static pressure acts on the plus side as well as at the minus side of the transmitter, it is compensated by the differential pressure generation). Dp = r g h Dp h = e g Dp: Hydrostatic pressure [N/m 2 ] r : Density of the fill fluid [kg/m 3 ] g: Acceleration due to gravity [m/sec 2 ] h: Level [m] Note: - When installation of the transmitter below the min. level is selected, the resulting height difference for the adjustment of zero and span must be noted (the liquid column in the capillary line influences the output). - Unlike gauge pressure transmitters the choice of the differential pressure transmitter is only made according to the expected pressure difference. The static pressure within limits needs not to be considered. This mounting location is recommended in where vacuum might occur. Dp h = r g This mounting location is only permissible if no vacuum occurs. 64 VEGADIF 34 51

65 Installation connections 5.5 Flow measurement Function The differential pressure method is based on the fact that the energy components are constant. The total energy consists of a dynamic element (due to the flow rate) and a static element (due to the pressure). A restriction within the line causes an increase of the flow rate and a reduction of the pressure. This pressure difference relates to the flow via the following relations: q = c Ö D P q: Flow c: A constant, depending on installation conditions D P : Measured differential pressure Installation connection for liquids For measurement of liquids the impulse lines must be completely filled with liquid. Gas in the impulse line or in the measuring cell causes measuring errors. Mounting the transmitter below the pressure tappings, the impulse lines can degas automatically. Hence the recommended installation position of the transmitter is below the pressure tappings Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Pipeline The transmitter can also be installed above the pressure tappings. With this connection air or gas pockets can be generated in the highest part of the measurement point which influence the measurement. Therefore a vent is necessary. This arrangement should only be selected with sufficient static pressure. The advantage is than in case of expected buildup: measuring cell and impulse lines clean automatically. VEGADIF

66 Installation connections Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Pipeline 1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line Installation connection for gases For the flow measurement of gases the impulse lines may be dry. The recommended installation position of the transmitter is above the pressure tappings. With an installation for flow measurement of vapours the transmitter may be installed below the pressure tappings, the break points of the impulse lines from the tappings have to be noted. They must have exactly the same height, to avoid pressure influence by condensate columns of different height Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line 66 VEGADIF 34 51

67 Installation connections Instructions for both connections - For steam flow measurements blow down lines should be installed. The line to the blow down valve should possibly be straight. - The pressure lines dissipate condensate heat. Hence they should not be insulated. - VDE/VDI-regulation 3512 or different DINstandards give further additional information. Installation connection for gases Humid gases at ambient temperatures contain a certain quantity of condensing particles. The recommended installation of the transmitter is hence above the tapping points so that condensate can return to the process. This connection prevents unequal condensate buildup at the transmitter and therefore measuring errors. The pressure lines must be run with sufficient gradient. With dry gases, installation of the transmitter above as well as below the pressure tappings is possible. Also in this case the impulse lines must be run with sufficient gradient so that condensate can flow to the drain valves Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line 8 Cooling chambers Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line 8 Cooling chambers Instructions for aggressive gases If the measuring cell needs protection from clean but aggressive gases, an installation with protective pots according to VDE/VDI 3512 should be selected. Alternatively the method of the protective gas washing can be used which is also applicable for dirty aggressive gases. VEGADIF

68 Diagnostics 6 Diagnostics Maintenance VEGADIF differential pressure transmitters are maintenance free. Just the wetted parts are subjected to a certain wear. Therefore check regularly the condition of the parts, especially of the diaphragms and process seals. Note the service instructions VEGADIF differential pressure transmitters. Repair If the measures for failure rectification are not successful, return the concerned instrument for repair to VEGA. Please note the following: Attach information: application, medium, failure description. Remove buildup, especially of substances hazardous to health. Failure rectification Due to the selfmonitoring VEGADIF differential pressure transmitters offer a high degree of reliability. Within the selfmonitoring, the signal circuit 4 20 ma is additionally used for transmission of failure information. If a failure is detected, the output current takes a value of 21.5 ma. Before removing the VEGADIF to check failures, the following should be checked: - atmospheric pressure compensation (for level measurements on open vessels) - electrical components and connections Checking the electrical components VEGADIF terminals Voltage Current External V ma energy source Instruction for Ex-applications Deviating from the above, terminal 1 and tag 1 are used only for shortterm connection to a certified, active floating (max. value: 470 mw) or an individual, passive floating measuring instrument. For connection the regulations for switching of intrinsically safe circuits (measuring instrument, supply and signal circuit) have to be noted. External overvoltage arresters (if available) - check on interruption and shortcircuit. Voltage - the terminal voltage on the differential pressure transmitter must be at least 11.5 V DC. - the supply voltage for the differential pressure transmitter e.g. by a VEGAMET signal conditioning instrument should be approx. 25 V DC. - + ~ Current Current value Condition ma standard range of the output current 21.5 ma fault signal 0 ma signal line interrupted < 3.6 ma electronics or pressure sensor element defective > 21.6 ma shortcircuit in the signal line, electronics or pressure sensor element defective 68 VEGADIF 34 51

69 Diagnostics 6.1 Failure codes In case of failures, VEGADIF provides failure codes. The bar graph provides the last valid measured values as a flashing figure in the display module. If several failures occur at the same time, the sequence of the indication depends on the priority of the failures. Code Type Reason and rectification E101 Failure Electrical instrument failure - EEPROM check sum error E102 Warning Electronic instrument failure with the pointer display - carry out a reset (Code 7864), re-adjust the instruments E103 Failure Initialisation is running - wait until the procedure is finished E104 Warning Sensor adjustment, calibration error, adjustment points too close together - new adjustment of the sensor E106 Failure Upload/Download active - wait until the procedure is finished E110 Failure Check sum error - carry out a reset (Code 5140), error remains - removal by service E111 Failure No connection to the sensor-eeprom (when switching on) E112 Failure No connection to the sensor ADC (only ceramic sensors) E113 Failure Measuring error during pressure and temperature measurement E114 Failure Measuring error during temperature measurement, temperature sensor defective E115 Failure Sensor gauge pressure P+ - remains until gauge pressure disappears E116 Failure Download error - restart download E120 Failure Sensor low pressure - remains until low pressure disappears E602 Warning Not monotonously raising or falling vessel characteristics - check the plausibility of the manually entered characteristics. Volume increases with the level? E604 Warning Vessel characteristics consists of less than 2 index markers - check the manually entered characteristics E605 Failure Manual linearisation curve incomplete. Enter the linearisation curve in mode Level linear and then choose the mode Characteristics. E610 Failure Adjustment error, same pressure value for Low and High - check the adjustment E620 Warning Signal current/measured value not within the permitted range < 3.8 ma or > 20.5 ma VEGADIF

70 Instrument modification 7 Instrument modification Mounting of the LC-display VEGADIF differential pressure transmitters can be equipped with a LC-display. Make sure that the measuring range on the display, e.g mbar, corresponds to the sensor data. During mounting penetration of humidity and aggressive products in the electronics box should be avoided. A special housing cover with window is supplied with the instrument. This covers the electronics box with integral LC-display. Fig. 6.1 Mounting of the LC-display Mounting procedure 1 Unscrew the housing cover of the electronics box. 2 Remove blind coupling on the electronics board in the transmitter. Plug the four-pole coupling of the LC-display to the socket of the electronics board until snap in. Note: The blind coupling should be kept, if the LCdisplay should be removed. 3 Insert the LC-display in the requested 90 position into the holder until snap in. 4 Cover the electronics box with the housing cover for the display. 70 VEGADIF 34 51