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WIKA · SF6 gas solutions · Family GD

Gas density sensor

For gas density, temperature and pressure of insulating gases, with Modbus ® or analogue 4 ... 20 mA signal
Range
0…16 bar
Output
Modbus® RTU · 4...20 mA
Accuracy
±1.25% (standard)
Protection
IP67
CERoHS
Price
On request
Depends on configuration
Request a quote
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Special features

  • High-accuracy sensing technology
  • Digital Modbus ® RTU or analogue 4 ... 20 mA output signal
  • IP67 ingress protection, optionally with IP6K9K field case
  • Very good long-term stability and EMC characteristics
  • Compact design
Identification
ModelGD-20
Product familyGD
SubcategoryGas density sensor
Measuring range
Pressure ranges0…2 bar · 0…3 bar · 0…6 bar · 0…8 bar · 0…10 bar · 0…12 bar · 0…16 bar
Density reference temperature20 °C
Accuracy
Accuracy class±1.25% (standard), ±0.75% (optional) depending on range and temperature
Process conditions
Process connection
G 1/2 BG 1/4 BG 3/8 B JIS1/4 NPTDN 6 female via adapterDN 8 female via adapterDN 20 female via adapterMalmquist (M30 x 2) female via adapterG 1/2 JISM20 x 1.5
Electrical characteristics
Output signalModbus® RTU · 4...20 mA
Materials
Wetted parts materialStainless steel 316L
Operating environment
Ambient temperature−40…+80 °C
IP ratingIP67
Certifications and approvals
Certifications
CERoHS
Additional details
Temperature compensationYes
Tables from datasheet
Basic information
Pressure referenceAbsolute
Case
MaterialStainless steel 316L
Case options■ Field case ■ Cable outlet ■ Metal cable outlet, shield optionally connected (heavy-duty version)
Compensated pressure range in bar abs. [psi abs.] at 20 °C [68 °F] (g/l SF₆)Pressure in bar abs. [psi abs.]TemperatureOutput parametersOutput signal
0 …2[0 ... 29] (12.28)0 …2.4 [0 ... 34.81]-40 …+80 °C [-40 ...+176 °F]■ Density ■ Pressure at 20 °C [68 °F] ■ Pressure ■ TemperatureModbus ® RTU
0 …3[0 ... 43.51] (18.65)0 …3.7 [0 ... 53.66]
0 ... 6 [0 ... 87.02] (38.87)0 ... 7.5 [0 ... 108.78]
0 …8[0 ... 116.03] (53.4)0 …10.1 [0 ... 146.49]
0 …10[0 ... 145.04] (68.96)0 …12.9 [0 ... 187.10]
0 …12[0 ... 174.05] (85.79)0 …15.7 [0 ... 227.71]
0 …16[0 ... 232.06] (124.64)0 …21.3 [0 ... 308.93]
Accuracy specifications
Accuracy 1)
Compensated pressure ranges in bar abs. [psi abs.] at 20 °C [68 °F] (g/l SF₆) 0 …2[0 ... 29] (12.28) 0 ... 6 [0 ... 87.02] (38.87) 0 …3[0 ... 43.51] (18.65)For -40 ... -20 °C [-40 ... -4 °F]■ ±2 %(standard) ■ ±1.5 %(optional)
For -20 ...+80 °C [-4 ...+176 °F]■ ±1.25 %(standard) ■ ±0.75 %(optional)
Compensated pressure ranges in bar abs. [psi abs.] at 20 °C [68 °F] (g/l SF₆) 0 …8[0 ... 116.03] (53.4) 0 …10[0 ... 145.04] (68.96) 0 …12[0 ... 174.05] (85.79) 0 …16[0 ... 232.06] (124.64)For -40 ...+80 °C [-40 ...+176 °F]■ ±1.25 %(standard) ■ ±0.6 %(optional)
Long-term stability at reference condi- tions±0.1 %per year for the density signal
Pressure accuracy■ ±1 %at 20 °C [68 °F] (standard) ■ ±0.2 %at 20 °C [68 °F] (optional)
Temperature accuracy±1.5 K
Reference conditionsPer IEC 61298-1
Compensated pressure range in bar abs. [psi abs.] at 20 °C [68 °F] (g/l SF₆)Accuracy 1)Output parametersOutput signal
0 …2[0 ... 29] (12.28)■ ±2 %(standard) ■ ±1.5 %(optional)Absolute pressure at 20 °C [68 °F]4 ...20mA
0 …3[0 ... 43.51] (18.65)
0 ... 6 [0 ... 87.02] (38.87)
0 …8[0 ... 116.03] (53.4)
0 …10[0 ... 145.04] (68.96)
0 …12[0 ... 174.05] (85.79)
0 …16[0 ... 232.06] (124.64)
View all (15)
Density range in g/l SF 6 (compensated pressure in bar abs. [psi abs.] at 20 °C [68 °F])Accuracy 1)Output parametersOutput signal
0 …10[0 ... 145.04] (1.64)■ ±2 %(standard)SF₆ gas density in g/l4 ...20mA
0 …16[0 ... 232.06] (2.59)■ ±1.5 %(optional)
0 ... 25 [0 ... 362.59] (3.97)
0 …40[0 ... 580.15] (6.16)
0 …60[0 ... 870.22] (8.87)
0 …80[0 ... 1160.30] (11.33)
Compensated pressure range in bar abs. at 20 °C [68 °F] (g/l SF₆)Overload safety in bar abs.Burst pressure in bar abs.
0 ... 2 (12.28)6.210
0 ... 3 (18.65)14.524
0 ... 6 (38.87)14.524
0 ... 8 (53.4)3152
0 ... 10 (68.96)3152
0 ... 12 (85.79)3152
0 ... 16 (124.64)62103
Name in accordance with IUPAC 2) nomenclatureAbbreviationDescription (CAS no.)
Sulphur hexafluorideSF 62551-62-4
NitrogenN 27727-37-9
TetrafluoromethaneCF 475-73-0
Oxygen 3)O 27782-44-7
Carbon dioxideCO 2124-38-9
2,3,3,3-Tetrafluoro-2-(trifluoromethyl)propanenitrile 4)C4-FN (fluoronitrile)42532-60-5
HeliumHe7440-59-7
ArgonAr7440-37-1
Output signal
Voltage supplyDC10…30V
Power consumption
Model GD-20-A≤ 0.75W
Model GD-20-D≤ 0.45W
Maximum permissible load R A (model GD-20-A)R A ≤ (U B - 9.5 V) / 0.023 A with R A in Ωand U B inV
Time response
Settling time 1)< 10 ms
Switch-on time 2)≤ 500 ms
Process connection
Thread size■ G1/2 B ■ G1/4 B ■ G3/8 B JIS ■ 1/4 NPT ■ DN 6 female via adapter ■ DN 8 female via adapter ■ DN 20 female via adapter ■ Malmquist (M30 x 2) female via adapter ■ G1/2 JIS ■ M20 x 1.5
Electrical connection
Digital version (model GD-20-D)■ Modbus ® -RTU via RS-485 interface ■ Circular connector M12 x 1 metal (5-pin) ■ Circular connector M12 x 1 plastic (5-pin)
Analogue version (model GD-20-A)■ Circular connector M12 x 1 metal (5-pin) ■ Circular connector M12 x 1 plastic (5-pin)
Operating conditions
Shock resistance
Single shock loads500g (1.4 ms, 1 shock, 3 axes)
Continuous shock100g (4 ms, 10,000 shocks, 3 axes)
Ingress protection (IP code) 1)
M12 x 1 plasticIP67, with mating connector
M12 x 1 metalIP67 2) , with mating connector
Cable outlet plasticIP67, with cable
Cable outlet metalIP67, with cable
Field caseIP6K9K, with cable / blind plug
Electrical safety
Model GD-20-DReverse polarity voltage U + vs.U -DC 30V 3)
Model GD-20-AReverse polarity voltage U + vs.U -DC 40V
EMC tests
Immunity to EMF30 V/m (at 80 MHz to 6 GHz)
Surge immunity per IEC 61000-4-52 kV on instrument case (shield connected on both sides) 1 kV, non-symmetrical, lines to ground, RS-485-A to RS-485-B, U + vs.U -
ESD per IEC 61000-4-28 kV contact discharge, 15 kV indirect discharge, 8 kV indirect discharge
Immunity against conducted HF signals per IEC 61000-4-610V at 150 kHz to 80 MHz
Immunity against fast transients (burst) per IEC 61000-4-44 kV
LogoDescriptionCountry
EU declaration of conformityEuropean Union
LogoDescriptionCountry
UL 1) Safety (e.g. electr. safety, overpressure, ...)USA and Canada
LogoDescription
-China RoHS directive
DesignationCase ingress protectionTemperature range in °C [°F]Shield provided by customerShield connected on the instrument sideAssignment
U +U -
Cable outlet2m [6.56 ft], plasticIP67-40 ...+80 °C [-40 ...+176 °F]Yes-BrownBlue
Cable outlet5m [16.40 ft], plasticYes-
Cable outlet 10m [32.80 ft], plasticYes-
Cable outlet2m [6.56 ft], SSYes-
Cable outlet5m [16.40 ft], SSYes-
Cable outlet 10m [32.80 ft], SSYes-
Cable outlet2m [6.56 ft], shield connect- ed, SSYesYes
Cable outlet5m [16.40 ft], shield con- nected, SSYesYes
Cable outlet 10m [32.80 ft], shield con- nected, SSYesYes
Field caseIP6K9K--12