Miniature flowmeters DK 46, DKR 46 DK 47, DK 48, DK 800
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1 KROHNE 1/ GR Miniature flowmeters DK 46, DKR 46 DK 47, DK 48, DK 8 Variable area flowmeters Vortex flowmeters Flow controllers Electromagnetic flowmeters Ultrasonic flowmeters Mass flowmeters Level measuring instruments Communications technology Engineering systems & solutions Switches, counters, displays and recorders Heat metering Pressure and temperature
2 Miniature flowmeters DK 46, DKR 46, DK 47, DK 48, DK 8 with glass metering cones Options All flowmeters (apart from DKR 46) can be equipped with limit switches and differential pressure regulators (options). Front plates and holding devices are available for panel mounting. The flowmeters can be converted into bench instruments with the aid of a support base (option). DK 46, DK 47, DK 48, DK 8 All flowmeters are equipped with a needle valve in the base to facilitate precise setting of gas and liquid flow rates. On request, these valves can also be fitted in the top connection block. The mounts are made of stainless steel, brass or PVDF and feature a specially designed fitting to take the glass cone. This device permits easy cone replacement without removal of the mount. Instrument designation Instruments with top and bottom connection block of: Stainless steel = DK... / R Brass = DK... / N PVDF = DK... / PV Compact flowmeter DKR 46 The DKR 46 is a DK 46 miniature flowmeter plus an RE flow regulator combined to form one compact unit. 2
3 Responsibility as to suitability and intended use of our instruments rests solely with the purchaser. Technical data Instrument type DK 46 DK 47 DK 48 DK 8 DKR 46 Measuring range (1% values) Water at 2 C, ; (68 F, US GPH) 2.5 to 16* 2.5 to 1.4 to to 16 (.66 to 42.27)* (.66 to 26.42) (.11 to 26.42) (.66 to 42.27) Air at 1.2 bar abs. (17.4 psia), 2 C, ; (68 F, SCFH) 5 to 16* 16 to 8 16 to 3 5 to 43 (.19 to 59.55) (.6 to 29.77) (.6 to ) (.19 to 16.3) DK 48: 1.13 bar abs. (14.7 psia), 2 C (68 F) air * DKR 46: max. 4 (1.57 US GPH) water or 8 (29.77 SCFH) air Turn-down ratio 1 : 1 1 : 1 1 : 1 1 : 1 Accuracy class to VDI/VDE Code 3513, Sh Measuring cone Length in mm (inches) 65 (2.65 ) 15 (5.91 ) 3 (11.81 ) 1 (3.94 ) Scale graduation flow units, DK 48 also in mm Float shapes Ball Ball A III Ball Operating data max. allowable operating pressure at 2 C (68 F). Test pressure is 1.5 times the specified max. allowable operating pressure.* Standard 1 bar 1 bar 1 bar 1 bar (145 psig) (145 psig) (145 psig) (145 psig) DK... / PV 6 bar 6 bar 6 bar 6 bar (87 psig) (87 psig) (87 psig) (87 psig) max. process temperature 1 C (212 F) 1 C (212 F) 1 C (212 F) 1 C (212 F) with limit switches 8 C (176 F) 8 C (176 F) 8 C (176 F) 8 C (176 F) * At temperatures > 2 C (68 F) pressure drops at the rate of 1% per degree C Overall height and connection dimensions see Dimensions and Weights Connection Standard 1/4 NPT 1/4 NPT 1/4 NPT 1/4 NPT Adapters Ermeto 6 and 8, Dilo, tubing nozzle 6 or 8 mm, Gyrolok and Swagelok Materials Measuring cone borosilicate glass Float Standard DK 46, 47, 8 Stainless steel (316) DK 48 Stainless steel (316 Ti) Options DK 46, 47, 8 titanium, POM (polyoxymethylene), glass DK 48 steatite, aluminium, hard rubber Float stop PTFE Valve spindle Stainless steel (316 Ti) Gaskets Standard Viton Option PTFE/FF KM (perfluorinated elastomer) PTFE (not for DK... / PV) Mount Top/bottom connection block: stainless steel (318 C17), brass or PVDF Rail: stainless steel (316 Ti) Ringinitiators DK 46 available available available DK 46, 47, 48, 8 3
4 Needle valves for gases and liquids Needle valves allow precise setting of the flow rate. Spindle Max. flow rate ( ) K v factor C v factor dia. mm (inches) Air* (SCFH) Water* (US GPH) m 3 /h US GPM 1. (.4 ) 1 (3.72) 5 (1.32) (.98 ) 1 (37.22) 5 (13.21) (.177 ) 43 (16.3) 16 (42.27) K v,c v = valve characteristic * Reference conditions: 2 C (68 F), 1.13 bar abs. (14.7 psia). Valve characteristics Air (SCFH) Spindle diameter 1. mm (approx.,4 ) Water (US GPH) Water Air 1 (3,72) 5 (1,32) 19 (3,35) 18 (2,98) 4 (1,6) 17 (2,61) 16 (2,23) 3 (,79) 15 (1,86) 14 (1,49) 2(, 53) 13 (1,12) 12 (,74) 1 (,26) 11 (,37) Valve rotation n Air Spindle diameter 2.5 mm (approx.,98 ) Water (SCFH) (US GPH) Water Air 1(37,22) 5(13,21) 19(33,49) 18(29,77) 4(1,57) 17(26,5) 16(22,33) 3 (7,93) 15(18,61) 14(14,89) 2 (5,28) 13(11,16) 12 (7,44) 1 (2,64) 11 (3,72) Valve rotation n Air (SCFH) 4(148,86) 35(13,26) 3(111,65) 25 (93,4) 2 (74,43) 15 (55,82) 1 (37,22) 15 (18,61) Spindle diameter 4.5 mm (approx.,177 ) Water Valve rotation n Air Water (US GPH) 16(42,27) 12(31,7) 8 (21,14) 4 (1,57) 4 DK 46, 47, 48, 8
5 Flow table Standard float materials DK 46, DKR 46, DK 47, DK 8: stainless steel (316) DK 48: stainless steel (316 Ti) 1% flow values Turn-down ratio 1 : 1 Reference conditions Water at 2 C (68 F) Air at 2 C (68 F) DK 46, DKR 46, DK 47, DK 8, 1.2 bar abs. (17.4 psia) DK 48, 1.13 bar abs. (14.7 psia) Ball dia. mm Cone No. Water Air DK 46, 47 DK 46 DK 46 DK 8 DK 48 DKR 46 DK 47 DK 48 DK 8 DKR 46 DK 47 DK 48 DK 8 US/GPH US/GPH US/GPH US/GPH SCFH SCFH SCFH SCFH 4 G G G G G G G G G G G * 15.85* * 59.55* G * 26.42* G * 15.85* 8 16* 42.27* * (not DKR 46) DK 46, 47, 48, 8 5
6 Responsibility as to suitability and intended use of our instruments rests solely with the purchaser. Differential pressure regulators Differential pressure regulators are used to help maintain constant flow rates at fluctuating operating pressure. Minimum pressure levels are required to permit operation of the regulators (see regulator characteristics) Differential pressure regulators are not pressure reducing valves Max. flow rate: 4 (2.48 SCFM) air or 16 (.7 US GPM) water. Connections: Standard: 1 /4 NPT Special version: Serto 6 or 8, tubing nozzles 6 or 8 mm, Ermeto 6 or 8, Dilo, Gyrolok, Swagelok Max. allowable operating pressure [at 2 C (68 F)]: 1 bar (145 psig) Temperatures up to max. 8 C (176 F) [option 1 C (212 F)]. Application ranges Inlet pressure regulators, type RE, NRE The RE and NRE regulators help maintain a constant flow rate for gases and liquids at variable inlet pressure and constant outlet pressure. Outlet pressure regulators, type RA, NRA For gaseous products, the RA and NRA regulators help maintain a constant flow rate at variable outlet pressure and constant inlet pressure. In order to function, the outlet pressure regulator requires a specific minimum pressure difference between inlet and outlet pressures. Inlet pressure p 1 must always be greater than outlet pressure p 2. Technical data Type Identifi- Material Max. measuring range Min. inlet cation Water** Air** pressure p1 Inlet pressure regulators US GPM SCFM p1 in bar p1 in psig RE-1-R RE 1 stainless steel RE-1-N RE 1 brass RE-4-R RE 4 stainless steel RE-4-N RE 4 brass NRE-1-R NRE 1 stainless steel NRE-1-N NRE 1 brass NRE-8-R NRE 8 stainless steel NRE-8-N NRE 8 brass Min. differential pressure* Outlet pressure regulators p in bar RA-1-R RA 1 stainless steel RA-1-N RA 1 brass RA-4-R RA 4 stainless steel RA-4-N RA 4 brass NRA-8-R NRA 8 stainless steel NRA-8-N NRA 8 brass * Differential pressure between inlet and outlet pressures ** Reference conditions: 2 C (68 F), 1.13 bar abs. (14.7 psia) 6 DK 46, 47, 48, 8
7 Regulator characteristics Inlet pressure regulators Type RE, NRE Example: variable inlet pressure 6 bar ( 87 psig) Air at 2 C (68 F), 1.13 bar abs. (14.7 psia) = flow rate Outlet pressure regulators Type RA, NRA Example: inlet pressure 6 bar (87 psig), variable outlet pressure 5.5 bar ( 8 psig) Air at 2 C (68 F), 1.13 bar abs. (14.7 psia) = flow rate (SCFM) 5 (3.1) (SCFM) 5 (3.1) 4 (2.48) 4 (2.48) 3 (1.86) 3 (1.86) 2 (1.24) 2 (1.24) 1 (.62) 1 (.62) 1 (14.5) 2 (29.1) 3 (43.51) 4 (58.2) 5 (72.52) p 1 = inlet pressure in bar (psig) 6 (87.) 1 (14.5) 2 (29.1) 3 (43.51) 4 (58.2) 5 (72.52) p 2 = outlet pressure in bar (psig) 6 (87.) Dimensions h mm inches DK DK DK DK /4 NPT 7 (2.75 ) h 21 (8.26 ) DK 46, 47, 48, 8 7
8 Limit switches To signal specific flow rates, the miniature flowmeters can be equipped with limit switches that initiate an electrical signal when a preset flow value has been reached. One limit switch is required for each limit value. Limit switches are only suitable for flowmeters fitted with stainless steel floats. The limit switches are inductive ring sensors designed to be slipped over the glass cone of DK flowmeters. An electrical signal is initiated when the metal float passes through the sensor. Monostable limit switches (see Table Limit Switches ) act as pulse contacts. Bistable limit switches detect the direction of movement of the float. Therefore a clear differentiation can be made between above or below the ring sensor. 2-wire limit switches have electrical values according to DIN EN 5227 (Namur wiring recommendations). Disconnect diodes are required. 3-wire limit switches can be wired in without disconnect. Application ranges for the limit switches DK 48 DK 46, DK 47, DK 8 } } Cone No. Ball dia. G mm (.16 ) RC 1-14-N G 15.9 RC 1-14-N3 G G mm (.24 ) RC N G RC N3 G 17.8 RB E2-Bi G From a measuring range of 1 (26.42 US GPH) water and 24 (89.32 SCFH) air onwards, the RC N and RC N3 limit switch can only be used as a minimum contact up to approx. 4% of the range. Function boxes with PG gland can be fitted to the flowmeters for connection to the limit switches. For bistable limit switches an EMC filter is needed in the junction box. Alternatively the filter unit can be mounted on a TS 32 rail. Ring sensors function in the same way as pulse contacts. RC 1-14-N3 (TG 1-1/bi) and RC N3 (TG 15-1/bi) are bistable ring sensors. The bistable ring sensors are supplied with an EMC filter either in a PG 11 junction box or in the form of a filter unit in a DIN rail housing. This arrangement enables the direction of movement of the float to be identified, thus providing a clear indication of the float position whether above or below the ring sensor. Isolation switching amplifiers are required to operate the ring sensors. Junction boxes with PG screw connection can be fitted to the flowmeters for connection of the limit switches. 8 DK 46, 47, 48, 8
9 Technical data Limit switches Version Function Approval Self-inductance Self-capacitance Type of protection Connection RC 1-14-N monostable, dia. 1 mm (dia..4 ) PTB 99 ATEX 2128X 1 µh 15 nf EEx ia IIC T1 T6 DIN EN 5227 RC 1-14-N3 bistable, dia. 1 mm 1) (dia..4 ) 1) PTB 99 ATEX 2128X 12 µh 9 nf EEx ia IIC T1 T6 DIN EN 5227 RC N monostable, dia. 15 mm (dia..6 ) PTB 99 ATEX 2128X 1 µh 15 nf EEx ia IIC T1 T6 DIN EN 5227 RC N3 bistable, dia. 15 mm 1) (dia..6 ) 1) PTB 99 ATEX 2128X 7 µh 9 nf EEx ia IIC T1 T6 DIN EN 5227 RB E2-bi bistable, dia. 15 mm 1) (dia..6 ) 1) non Ex-approval 3-wire 1) One of the EMC filters specified below is required for operation of bistable limit switches in Europe. Limit switch Type RC Connection technique 2-wire connection to DIN EN 5227 Rated voltage 8 V DC Power consumption Version RC N 3 ma (active area clear) 1 ma (active area obscured) Version RC N3 below limit value 1mA above limit value 3mA Ambient temperature - 2 C to + 1 C (- 4 F to F) Protection category to DIN 6529/IEC 529 IP 67, equivalent to NEMA 6 Electromagnetic compatibility (EMC) to EN Connection.2 m (8 ) PVC cable (.14 mm2) (.22 sqin) or connecting housing PG11 Housing material PBT Electrical characteristics to DIN 5227 (NAMUR recommended circuitry) Version RB Connection technology 3-wire technology Operating voltage U b 1 V to 3 V Operating current I b to 1 ma Output voltage U a below limit value 1 V above limit value U b 3 V after switching on 1 V No-load current 2 ma Ambient temperature -25 to +7 C (-13 to +158 F) Protection category IP 67 (EN 6529) Electromagnetic compatibility (EMC) to EN Connection 2 m (6.56 ft) PUR cable (no terminal box on device) Core cross-section.14 mm2 (.22 sqin) Housing material PBT EMC filters for limit switches Version Function Approval Self-inductance 2) Self-capacitance 2) Type of protection EMC-Y3862 EMC filter 1 Channel, internal 4) DMT 99 ATEX 14X 6 µh 4 nf EEx ia IIC T6 or EMC-Y38622 EMC filter 2 Channel, Internal 4) DMT 99 ATEX 14X 6 µh 3) 4 nf 3) EEx ia IIC T5 or KC-EMC-Y38624 EMC filter 1 Channel, external 5) DMT 99 ATEX 14X 6 µh 4 nf EEx ia IIC T1 T4 2) the effective inner inductance and capacitance of the EMC filter additionally need to be taken into account. 3) per channel, 4) filter built into the DK terminal box, 5) filter in external DIN rail housing Max. allowable ambient temperature for limit switches Circuit with peak values of Ui < 16V Ii < 25 ma Pi < 34 mw Ui < 16V Ii < 25 ma Pi < 64 mw Ui < 16V Ii < 52 ma Pi < 169 mw Temperature class T6 T5 T4 T1 T6 T5 T4 T1 T6 T5 T4 T1 Max. allowable ambient temperature 75 C (167 F) 9 C (194 F) 1 C (212 F) 7 C (158 F) 85 C (185 F) 1 C (212 F) 55 C (131 F) 7 C (158 F) 9 C (194 F) Max. allowable ambient temperature for EMC filters Max. allowable ambient temperature 65 C (149 F) 8 C (176 F) 1 C (212 F) DK 46, 47, 48, 8 9
10 Dimensions and weights Instrument Dimensions in mm and inches Weight type Panel recess Cover plate a b c d e f g mm inches mm inches mm inches mm inches mm inches mm inches mm inches kg lbs DK DK DK DK DKR DK 46, DK 47, DK 48, DK 8 Dimensions in mm and inches c Flow regulators RA, NRA, RE, NRE Instrument Dimensions type c 1 c 2 d 1 d 2 mm inches mm inches mm inches mm inches DK DK DK DK Weight: 1.5 kg (3.31 lbs) approx. d1 approx. d2 7 (2.76 ) 1/4 NPT DKR 46 Panel mounting Cover plate 45 (1.77 ) 9 (3.54 ) approx. 138 (5.43 ) (.31 ) 7 e g dia. 8 b a dia. 18 (.17 ) 15 (6 ) 28 (1.1 ) 225(.89 ) 1/4 NPT dia. 4.3 (.17 ) max. approx. 82 (3.23 ) C2 C1 (2.76 ) dia. 9 (3.54 ) 27.5 (1.8 ) d f 2.5 (.1 ) dia. 83 (3.27 ) approx. 13 (5.12 ) 4 (1.57 ) 1 DK 46, 47, 48, 8
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