NRGS Installation Instructions Level electrode NRGS A Siebe Group Product 1
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1 NRGS 16-2 Installation Instructions Level electrode NRGS 16-2 A Siebe Group Product 1
2 Dimensions , 1000, Fig. 1 2
3 NRGS 16-2 A B C 40 1" BSP DIN 228 N N8 Fig. 2 Fig. 3 3
4 NRGS 16-2 MAX 70 C MAX 95 % D E F G H I J Fig. 4 P O N M L Fig. 5 K 4
5 Legend A B C D E F G H I J K L M N O P Electrode thread 1" BSP, DIN 228 Seating surface Joint ring (of stainless steel ) D 33 x 39 to DIN 7603 Housing screws M4 Cable entry PG 9/PG 16 Housing cover LED Low level alarm LED Low level alarm LED Pump ON DIP switch Measuring range Button Test Terminal strip PE connection Terminal strip Test Thermal fuse T max 102 C Screw 5
6 Contents Important Notes Page Safety Note...7 Danger... 7 Warning... 7 Explanatory Notes Scope of supply...8 System description... 8 Function...8 Design...8 Technical data... 9, 10 Installation NRGS , 11 Table Functions Examples of installation Wiring NRGS Standard Setting Factory setting Switch selection of measuring range Commissioning Warning...14 Wiring check Application of mains voltage Checking of switching functions Checking of low level alarm Annex Warning...15 Fault finding list...15 Declaraction of conformity
7 Important Notes Safety Note Use compact system for level monitoring type NRGS 16-2 only for level indication. Installation must only be performed by qualified staff. Qualified staff are those persons who through adequate training in electrical engineering, the use and application of safety equipment in accordance with regulations concerning electrical safety systems, and first aid & accident prevention have achieved a recognised level of competence appropriate to the installation and commissioning of this device. Danger When loosening the electrode live steam or hot water might escape. This presents the danger of severe injury. It is therefore essential not to dismantle the electrode unless the boiler pressure is verified to be zero. Warning The terminal strip of the NRGS 16-2 is live during operation. This presents the danger of electric shock. Cut off power supply before fixing or removing the housing cover. 7
8 Explanatory Notes Scope of Supply NRGS Compact system type NRGS Joint ring (of stainless steel ) D 33 x 39 DIN Installation Instruction System Description The compact system NRGS 16-2 works according to the conductivity measurement principle. With the NRGS 16-2 a maximum of 3 levels can be signalled in conductive liquids: Low level alarm, pump ON, pump OFF with one normally open contact The NRGS 16-2 has a level switch integrated in the electrode case for the controlling of all functions. An external switching device is not required. The NRGS 16-2 has two electrode rods for the detection of low water level. The signalling of the low-level alarm is effected via two separate switching channels. Function The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which means that they allow an electric current to flow through them. For the safe functioning of this device a minimum conductivity of the liquid to be measured is required. The conductivity measurement method can detect two conditions: electrode rod submerged/ exposed or switchpoint reached/ not reached. Before installation, the length of the electrode rod must be adapted to the switching levels, e. g. for max./min. alarm, controlling of a valve or pump. Design NRGS 16-2: Screwed design 1" BSP, DIN ISO 228. Fig. 1 8
9 Technical Data Type Approval N TÜV. WR/WB Max. service pressure 32 bar g at 238 C Connections Screwed 1" BSP, DIN ISO 228 Flanged DN 50, PN 40, DIN 2635 Materials Case Die cast aluminium (G AlSi8Cu3) Stem S. S (CrNiMoTi ) Flange Forged steel (C 22.8) Measuring electrodes S. S (CrNiMoTi ) Electrode insulation PTFE Spacer disc PTFE Lengths supplied 1500 mm 1000 mm 1500 mm Mains supply 230 V +/ 10 %, 50/60 Hz 115 V +/ 10 %, 50/60 Hz 224 V +/ 10 %, 50/60 Hz (option) Power consumption 5 VA Fuse Thermal fuse T max = 102 C Sensitivity Range 1: 10 µs/cm Range 2: 0.5 µs/cm Electrode voltage 10 V ss Output 2 volt-free relay contacts. 1 volt-free normally open contact. Max. contact rating with a switchting voltage of 24 V, 115 V and 230 V a. c.: ohmic 4 A, inductive 0.75 A at cos ϕ 0.5. Max contact rating with a switching voltage of 24 V d. c.: 4 A Contact material: silver, hard-gold plated 9
10 Technical Data - continued Indicators and adjustors 2 red LEDs for signalling Low water, 1 green LED for signalling Pump ON, 1 four-pole DIP switch for changing sensitivity, 1 button TEST for functional checking of low level alarm Cable entry Cable gland with integral cable clamp 1 x PG 19 1 x PG 16 Protection IP 65 to DIN Max. admissible ambient temperature 70 C (158 F) Weight approx. 1.8 kg Installation NRGS Determine required measuring lengths of electrode rods and enter data in table 1 Fig Cut electrode rods 1, 2, 3 and 4 accordingly. The electrode rods 1 and 2 (low level limiter) must have the same length. 3. Deburr faces of electrode tips. 4. Strip off 50 mm of PTFE insulation from the ends of electrode tips. 5. Check seating surfaces of threads or flange provided on vessel or boiler standpipe. Fig Place joint ring C onto seating surface B of electrode Fig. 2. Use only joint ring (of stainless steel ) D 33 x 39 to DIN 7603 supplied with electrode. 7. Apply a light smear of silicone grease (e. g. DOW Corning 111 Compound) to electrode thread A. 8. Screw level electrode into threads or flange provided on vessel or boiler standpipe and tighten with a 41 mm open-end spanner. The torque required is 140 Nm when cold. 10
11 Installation - continued Table 1 Function Function Electrode rod Length [mm] Low-level alarm 1 Low-level alarm 2 e. g. Pump ON 3 e. g. Pump OFF 4 Attention The seating surfaces of the threads or flange provided on the vessel or boiler standpipe must be accurately machined. Fig. 3 Do not bend electrode rod when mounting. Do not lag electrode body. Note For the approval of the boiler standpipe with connecting flange the relevant local and national regulations must be considered. See four examples of installation on page 17. Tools Open-end spanner 41 mm A. F. Bolt cutter Hacksaw Flat file, medium cut 11
12 Wiring NRGS 16-2 Use multi-core flexible cable with min. conductor size 1.5 mm 2 for wiring. 1. Unscrew screws D, remove housing cover F Fig Unscrew union nuts of cable entry E. The electrode terminal can be turned through +/ Loosen screw P with 17 mm open-end spanner but do not remove. Fig Turn electrode terminal into desired direction (+/ 180 ). 5. Tighten screw P slightly. 6. Remove terminal strip L from board. 7. Connect terminal strip according to wiring diagram, connect PE connection M. 8. Plug in terminal strip. 9. Replace housing cover F, fasten screws D and install cable entry. Wiring diagram Fig. 6 Mains Attention Fuse supply cables with T 250 ma. Tools Screwdriver for cross head ( Phillips ) screws, size 1 Screwdriver for slotted screws, size 2.5; completely insulated according to VDE 0680 Open-end spanner 17 mm A. F. 12
13 Standard setting Factory setting The compact system is delivered with the following factory settings: Measuring range 10 µs/cm Switch selection of measuring range The measuring range can be switch selected between 0.5 µs/cm and 10 µs/cm by means of DIP switch J : 1.Unscrew screws D at the electrode terminal, remove cover F, Fig. 6 DIP switch 1 4 OFF Measuring range 0.5 µs/cm DIP switch 1 4 ON Measuring range 10 µs/cm 2.Replace cover F and fasten screws D Attention Do not damage the electronic components when operating DIP switch. Tools Screwdriver for cross head ( Phillips ) screws, size 1 Screwdriver for slotted screws, size 2.5; completely insulated according to VDE
14 Commissioning Warning The terminal strip of the NRGS 16-2 is live during operation. This presents the danger of electric shock. Cut off power supply before removing or replacing housing cover. Wiring check 1. Check whether the system NRGS 16-2 has been wired according to wiring diagram Fig Check whether mains supply corresponds to the wiring carried out on the equipment. Application of mains voltage 1. Switch on mains supply and check the correct functioning of the equipment at the corresponding switchpoints. LEDs G, H, I are provided for visual check of switchpoints. Fig. 5 Remove housing cover F to check LEDs G, H, I. See Wiring Check correlation of switching functions 1. Check the switching function Low level alarm of the electrode rods 1 and 2. For this test the level in the vessel must fall below the low level mark. The low-level alarm must then be activated by the level switch. 2. Check the switching function Pump ON and Pump OFF. See table 1. Check low-level alarm The function of the low-level alarm can be simulated by pushing the button TEST K. Fig. 5 The low-level alarm must then be activated. 14
15 Annex Warning The terminal strip of the NRGS 16-2 is live during operation. This presents the danger of electric shock. Cut off power supply before removing or replacing housing cover. Fault finding list Switchpoint Pump ON has been exceeded no function Fault: Mains voltage has not been applied. Remedy: Apply mains voltage. Wire equipment according to the wiring diagram. Fault: The thermal fuse has failed. Remedy: In case of defective thermal fuse the mains voltage has not been connected to terminal N : Replace defective thermal fuse (Order No ). The ambient temperature must not exceed 70 C. Switchpoint Pump OFF has been exceeded no function Fault: The electric conductivity is too low. Remedy: Switch DIP switch J to 0.5 µs/cm. Fault: The electrode housing does not have earth connection to the boiler. Remedy: Clean seating surfaces and insert metal joint ring (of stainless steel ) 33 x 39 to DIN Do not insulate compact system with hemp or PTFE tape! Fault: Electronic board is defective. Remedy: Replace board (Order No ). Level has fallen below switchpoint Low water no function Fault: The electrode rods have earth contact. Remedy: Change installation position. Fault: The vent hole in the protection tube does not exist, is obstructed or flooded. Remedy: Check protection tube and, if necessary, provide vent hole. Fault: The isolating valves of the external measuring pot (optional) are closed. Remedy: Open isolating valves. Switchpoint has been reached incorrect function Fault: The switching function has not been correctly allocated. Electrode rods have been cut to the wrong size. Remedy: Identify electrode supply wire and reconnect accordingly. 15
16 Annex - continued Declaration of conformity We hereby declare that the equipment NRGS 16-2 conforms to the following European guidelines: LV guideline 73/23/EWG version 93/68/EWG EMC guideline 89/336/EWG version 93/68/EWG which are based on the following harmonised standards: LV standard EN : 1991 EMC standard EN , EN This declaration is no longer valid if modifications are made to the equipment without consultation with us. Bremen, 28th April 1997 GESTRA GmbH Dr. Anno Krautwald Dr. Christian Politt Legend Flange PN 40, DN 50 (2"), DIN 2527 Flange PN 40, DN 100 (4"), DIN 2527 For the approval of the boiler standpipe with connecting flange the relevant regulations must be considered. Vent hole High water (HW) Electrode rod d = 5 mm Protection tube DN 80 Protection tube DN 100 Electrode distance 14 mm Electrode distance 40 mm Low water (LW) Reducer K-88.9 x x 2.6 W to DIN 2616, part 2 Reducer K x x 2.9 W to DIN, 2616 part 2 16
17 Examples of installation DN 50 1" BSP 1 2 DN 50 1" BSP Fig. 7 Fig " BSP ¾" BSP 1" BSP 1 2 DN DN DN 20 ME Fig. 9 Fig. 10 DN 20 17
18 GESTRA Gesellschaften GESTRA Companies Sociétés GESTRA Sociedades Gestra Società GESTRA Vertretungen weltweit Agencies all over the world Représentations dans le monde entier Representaciones en todo el mundo Agenzie in tutto il mondo España Siebe GESTRA Instrument ESPAÑOLA & Valve S.A. Division GESTRA Luis Cabrera, ESPAÑOLA S.A. Luis E Cabrera, Madrid E Tel. 34Madrid 91 / Tel. Fax / ; (91) Fax (91) gestra@gestra.es France France Siebe Instrument & Valve Division Flowserve Flow Control S. A. S. GESTRA S.A.R.L. 10 Avenue du Centaure, BP , rue André Pontier F CERGY PONTOISE CEDEX F Nogent-sur-Marne Tél / Tél Fax 00331/ Fax gnation@flowserve.com Great Britain Italia Siebe Instrument & Valve Division GESTRA Italgestra (U.K.) S.r.l. LTD Via Carducci Bancroft 125 Court Hitchin, l Hertfordshire, Sesto San Giovanni SG5 1PH (MI) Tel. 00 ( ) 02 / Fax 00 ( ) 02 / info@italgestra.it Italia Polska Siebe GESTRA Instrument POLONIA & Spolka Valve Division z o.o. GESTRA Ul. Schuberta POLONIA 104, P. O. Spolka Box 71 z.o.o. Ul. PL Oplotki, Gdansk 1, P. O.B. 727 PL Tel Gdansk / oder Tel. Fax 00 (58) / oder Fax (58) gestra@gestra.pl Portugal Portugal Siebe Instrument & Valve Division GESTRA PORTUGUESA VALVULAS LDA. GESTRA PORTUGUESA VALVULAS LDA. Av. Dr. Antunes Guimarães, 1159 Av. Dr. Antunes Guimarães, 1159 Porto P-4100 Porto, Tel / Tel. (2) Fax / Fax (2) gestra@gestra.pt USA Siebe Instrument & Valve Division GESTRA INC. 10 York Avenue West Caldwell, N.Y Tel. (2 01) Fax (2 01) Siebe Instrument & Valve Division ITALGESTRA S.r.l. Via Carducci 125 l S.S. Giovanni (MI) Tel. (02) Fax (02) GESTRA GmbH Postfach Siebe Instrument & Valve Division D Bremen Münchener GESTRA GmbH Str. 77 D Hemmstraße Bremen 130 Tel. D (0) Bremen Fax Tel. +49 (0) Fax +49 gestra.gmbh@gestra.de (0) Internet A Siebe Unit of Group Flowserve Company Corporation /1297c 1997 GESTRA GmbH Bremen Printed in Germany 18
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