Dew point transmitter – DewPro® MMY31

The DewPro MMY31 measures dew point or ppmv in gases. It is a cost-effective, loop-powered dew point transmitter designed for “in-line” installation where trace moisture measurement is required. The planar aluminum oxide sensor provides excellent corrosion resistance, longer calibration stability, quick response times, and an exceptionally low temperature coefficient.

The DewPro MMY31 mounts directly in-line in your process gas, where a bypass installation is not appropriate. It is easily installed via a variety of adjustable insertion length compression fittings. The optional integrated display with user interface provides full programming and diagnostic capability.
Applications include glove boxes, environmental chambers, test chambers, and other locations where direct insertion is required.


  • Loop-powered, 4 to 20 mA transmitter
  • Fast response planar aluminum oxide sensor
  • Trouble-free indoor or outdoor mounting
  • Field validation with the MMY245 moisture analyzer
  • Microcontroller electronics in Type 4X/IP67 enclosure
Sensing element  : Planar aluminum oxide sensor
Output  : 4 to 20 mA loop-powered, 16 μA resolution
Power supply  : 24 VDC nominal, 12 to 30 VDC
Protection  : Type 4X/IP67


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