Instrument Expert
Original factory packaging
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(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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Product Manual
Hygrometer For Trace Moisture in Pure Gases
Features
Measures down to -120 °Cdp (-184 °Fdp) (1ppbV)
Stable and repeatable measurement
Fast response
Modbus RTU over RS485 communication
4...20 mA 2 wire
Traceable 7-point calibration certificate
1/2”, 1/4” male VCR process connections
Optional monitor/controller
MiniDIN 43650 C, M12 electrical connectors
Optional hazardous area approval
Service exchange program
This small transmitter is a rugged dew-point sensor for the measurement of trace moisture in ultra-high purity gases.
Simple to use and install, the Pura features analog and digital outputs with optional I.S. approvals, plus there is a range of VCR process connections and electrical connections. A service exchange program is also available, reducing the cost of maintenance.
Specifications
| Transmitters | ||
| Product | Pura 2-wire, 3-wire & Digital Transmitters | Pura I.S. Transmitter |
| Performance Specifications | ||
| Measurement Range | -120...-40 °Cdp (-184...-40 °Fdp); non-standard ranges available on request | |
| Accuracy |
±1 °C from -40 to -60 °Cdp
(±1.8 °F from -40 to -76 °Fdp) ± 2°C from -60 to -100 °Cdp (±3.6 °C from -76 to -148 °Fdp) ±4 °C from -100 to -120 °Cdp (±7.2 °C from -148 to -184 °Fdp (extrapolated) |
|
| Calibration | Traceable 7-point calibration certificate | |
| Electrical Specifications | ||
| Output Signal |
4...20 mA (2-wire connection, current source) 4...20 mA (3-wire connection, current sink) Pura M12: Modbus RTU over RS485 Pura 3-wire PUR-AOL-SEN-D: Michell Mnet digital |
4...20 mA (2-wire connection, current source) |
| Output | Dew point or moisture content (ppmV, ppbV) | |
| Analog Output Scaled Range | Dew point: -120...-40 °C (-184...-40 °F); Moisture content in gas: 0...127 ppmV; | |
| Supply Voltage |
Pura 2-wire/3-wire & Pura I.S.: 12...28 V DC Pura M12: 5...28 V DC (digital)* |
|
| Load Resistance | Max 250 Ω @ 14 V (500 Ω @ 24 V) | |
| Current Consumption | 23 mA max, depending on output signal | |
| Compliances | CE & UKCA | |
| Operating Specifications | ||
| Operating Temperature | -40...+60 °C (-40...+140 °F) | |
| Compensated Temperature Range | -20...+50 °C (-4...+122 °F) | |
| Storage Temperature | -40...+60 °C (-40...+140 °F) | |
| Operating Pressure |
Minimum 10-7 Pa (10-9 torr); Maximum 24 MPa (240 barg/3481 psig) |
|
| Flow Rate | 1...5 Nl/min mounted in standard sampling block; 0...10 m/sec direct insertion | |
| Mechanical Specifications | ||
| Ingress Protection |
IP66 in accordance with standard BS EN 60529:1992;
NEMA 4 protection in accordance with standard NEMA 250–2003 Pura M12: IP65 |
|
| Intrinsically Safe Area Certificates |
ATEX/UKCA: II 1 G Ex ia IIC T4 Ga (-20...+70 °C) IECEx: Ex ia IIC T4 Ga (-20...+70 °C) TR CU: 0Ex ia IIC T4 Ga (-20...+70 °C) cQPSus: Class I, Division 1, Groups A, B, C & D, T4 Class I, Zone 0, AEx ia IIC T4 Ga, Ex ia IIC T4 Ga Tamb +70 °C |
|
| Housing Material | 316 stainless steel | |
| Dimensions | Please refer to the dimensional drawings on page 4 of this datasheet | |
| Packaging |
Pura Premium: Double bagged and sealed in UHP inert gas Pura OEM and Pura Sensor: Single bagged in 1000 gauge polythene All options: shipped individually in a profiled cardboard carton Sensor version supplied with protective guard over sensor technology for transportation and handling |
|
| Process Connection |
Pura Premium (PRM): 2 x 1/4” male VCR Pura OEM (OEM): 2 x 1/4” male VCR Pura Sensor (SEN): 1/2” male VCR |
|
| Weight |
PRM and OEM versions: 450 g (0.99 lb) SEN version: 180 g (0.4 lb) |
|
| Electrical Connections |
Pura: MiniDIN 43650 form C Pura M12: M12 5 Pin (A coded) |
MiniDIN 43650 form C |
| Mating Electrical Connectors |
Mating connector supplied as standard Pura M12: optional 0.8, 2, 5 metre (2.62, 6.56, 16.4 foot) M12 A coded connector/cable available |
|
| Diagnostic Conditions (factory programmed) |
Sensor fault: 23 mA Under-range dew point: 4 mA Over-range dew point: 20 mA |
|
| Approved Galvanic Isolators |
KFD2-CR-EX1.20200 KFD2-CR-EX1.30200 KFD0-CS-EX1.50P KFD0-CS-EX2.50P KFD2-STC4-EX1.H MTL5041 MTL5040 |
|
Suitable Applications
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