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Product Detail
Michell SF72 Dew-Point Transmitter

Michell SF72 Dew-Point Transmitter

Product Detail
Rail DewPoint Transmitter - Michell SF72 RailFor Moisture Control in Rail Rolling Stock Compressed Air Dryers


Features

  • M12 electrical connector

  • Dew-point measurement range –60 to +60 °Cdp (-76 to +140°Fdp)

  • Fast response

  • 316 stainless steel IP66 construction

  • Traceable calibration certificate

  • Accuracy ±2°Cdp (±3.6°Fdp)

  • G 1/2” BSP process connection

A cost-effective moisture transmitter designed to continuously monitor the performance of the compressed air dryers on railway rolling stock to ensure the 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.

The sensor has the following rail-industry approvals:

  • EMC/RFI approval to rail standard EN50121-3-2:2016

  • Shock/vibration approved to rail standard IEC16373:1999-01 (EN50155)

Suitable Applications
  • Monitoring compressed air dryers on railway rolling stock

Specification

Performance
Measurement range (dp)–60...+60°C (-76...+140°F) dew point
Accuracy (dp)±2°C (±3.6°F) dew point
Repeatability±0.2°C (±0.36°F) 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...+60°C (-76...+140°F)
Non-standard available upon request
Supply voltage12...28 V DC
Load resistanceMax 250 Ω @ 12 V (500 Ω @ 24 V)
500 Ω @ 24 V
CompliancesCE & UKCA
Operating Specifications
Start-up temperatureAmbient: -40...+50°C (-40...+122°F)
Gas: –40...+70°C (-40...+158°F)
Operating temperatureAmbient: -40...+50°C (-40...+122°F)
Gas: –40...+60°C (-40...+140°F)
Storage temperature–40...+85°C (-40...+185°F)
Operating pressure45MPa (450 barg/6526 psig) maximum
Over pressure ratingx2 operating pressure 90 MPa (900 barg/13053 psig)
Flow rate1...5 Nl/min mounted in standard sampling block;
0...10m/sec (0...32.8 fps) direct insertion insertion
Thermal compensationCharacterized over operating range
Mechanical Specifications
Ingress protectionIP66 in accordance with standard BS EN 60529:1992
Housing material316 stainless steel
DimensionsL=119mm (4.69”) (including HDPE filter) x ø27mm (ø1.06”)
FilterStandard: HDPE guard <10µm
Process connection and materialG 1/2” BSP, 316 stainless steel
Weight150g (5.29oz)
Electrical connectionsM12, 4 pin (A coded)
Digital diagnostic communicationsRS485, 2-wire Modbus RTU
Diagnostic conditions
(factory programmed)
Condition
Sensor fault
Under-range dew point
Over-range dew point

Output
23 mA
4 mA
20 mA
Rail Certifications
Shock and vibrationIEC 61373:1999-01 (EN 50155)
RFI/EMC emissions and immunityEN 50121-3-2:2016