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Product Detail
Michell Pura

Michell Pura

Product Detail
Trace Moisture Transmitter - Michell PuraHygrometer 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.


Suitable Applications

  • Gas purification systems

  • Semiconductor manufacture

  • Pure gases

  • Fibre optic production

  • Optical coating processes

  • Electronic component manufacture

  • Speciality gas production and distribution

Specification

Transmitters
ProductPura 2-wire, 3-wire & Digital TransmittersPura 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)
CalibrationTraceable 7-point calibration certificate
Electrical Specifications
Output Signal4...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)
OutputDew point or moisture content (ppmV, ppbV)
Analog Output Scaled RangeDew point: -120...-40 °C (-184...-40 °F); Moisture content in gas: 0...127 ppmV;
Supply VoltagePura 2-wire/3-wire & Pura I.S.: 12...28 V DC
Pura M12: 5...28 V DC (digital)*
Load ResistanceMax 250 Ω @ 14 V (500 Ω @ 24 V)
Current Consumption23 mA max, depending on output signal
CompliancesCE & 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 PressureMinimum 10-7 Pa (10-9 torr);
Maximum 24 MPa (240 barg/3481 psig)
Flow Rate1...5 Nl/min mounted in standard sampling block; 0...10 m/sec direct insertion
Mechanical Specifications
Ingress ProtectionIP66 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 Material316 stainless steel
DimensionsPlease refer to the dimensional drawings on page 4 of this datasheet
PackagingPura 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 ConnectionPura Premium (PRM): 2 x 1/4” male VCR
Pura OEM (OEM): 2 x 1/4” male VCR
Pura Sensor (SEN): 1/2” male VCR
WeightPRM and OEM versions: 450 g (0.99 lb)
SEN version: 180 g (0.4 lb)
Electrical ConnectionsPura: MiniDIN 43650 form C
Pura M12: M12 5 Pin (A coded)
MiniDIN 43650 form C
Mating Electrical ConnectorsMating 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