Michell Instruments

SF72 Rail Moisture Transmitter

Cost-effective moisture transmitter designed to monitor performance of the compressed air dryers on railway rolling stock

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SF72 Rail Moisture Transmitter 05575

A cost-effective moisture transmitter designed to continuously monitor the performance of the compressed air dryers on railway rolling stock to ensure both safety and efficiency of braking and other systems.

Using Michell’s latest generation of polymer moisture sensor to provide fast, reliable readings of dew-point, allowing for fast action to be taken by operators.

The transmitter itself has a heavy duty M12 electrical connector and is calibrated to measure within the range of -60 to +60°C dew point: wide enough to cope with extreme conditions found in railways around the world.

• M12 electrical connector
• Dew-point measurement range –60 to +60°Cdp
• Fast response
• 316 stainless steel IP66 construction
• Traceable calibration certificate
• Accuracy ±2°Cdp
• G 1/2” BSP process connection

Measurement Range (dp)–60 to +60°C dew point
Accuracy (dp)±2°C dew point
Repeatability0.2°C dew point
Long Term StabilityLess than 1% per year at reference conditions
CalibrationTraceable 8-point calibration certificate
Electrical Specifications
Output Signal4-20 mA (2-wire connection, current source)
OutputDew point
Analog Output Scaled RangeStandard: –60 to +60°C
Non-standard available upon request
Supply Voltage12 to 28 V DC
Load ResistanceMax 250 Ω @ 12 V (500 Ω @ 24 V)
500 Ω @ 24 V
CE MarkedCertified
Operating Specifications
Start-Up TemperatureAmbient: -40 to + +50°C
Gas: –40 to +70°C
Mechanical Specifications
Ingress ProtectionIP66 in accordance with standard BS EN 60529:1992
Housing Material316 stainless steel
DimensionsL=119mm (including HDPE filter) x ø27mm
FilterStandard: HDPE guard <10µm
Process Connection and MaterialG 1/2” BSP, 316 stainless steel
Weight150g
Electrical ConnectionsM12, 4 pin (A coded)
Digital Diagnostic CommunicationsRS485, 2-wire Modbus RTU
Diagnostic Conditions (Factory Programmed)Condition-Output
Sensor fault-23mA
Under range dew point-4mA
Over range dew point-20mA
Rail Certifications
Shock and VibrationIEC 61373:1999-01
RFI/EMC Emissions and ImmunityEN 50121-3-2:2006
Performance

 • Monitoring compressed air dryers on railway rolling stock

 
  • Thumbnail of document Data Sheet - SF72 Rail Moisture Transmitter
    Download

    Data Sheet - SF72 Rail Moisture Transmitter

    Download
  • Thumbnail of document Manual - SF72 Rail Moisture Transmitter
    Download

    Manual - SF72 Rail Moisture Transmitter

    Download

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