Moisture Transmitter – DewPro® MMR30

The DewPro MMR30 is a compact, mid-range moisture transmitter designed specifically for refrigeration dryer manufacturers and users. The DewPro MMR30 measures dew point at line pressure or atmospheric pressure and installs easily on a dryer outlet header.

The DewPro MMR30 uses a proven polymer capacitive sensor to provide a measurement range of 5°F to 185°F (-15°C to 85°C) with ±1.8°F (±1.0°C) accuracy. The optional integrated display with user interface provides full programming and diagnostic capability.


  • Loop-powered, 4 to 20 mA transmitter
  • Proven polymer capacitive sensor for fast response and calibration stability
  • Integral filtering and flow regulation
  • Trouble-free indoor or outdoor mounting
  • Microcontroller electronics in Type 4X/IP67 enclosure
Dew point range  : 5°F to 185°F (-15°C to 85°C)
Supply power  : 24 VDC nominal, tolerance 12 to 30 VDC
Protection  : Type 4X/IP67
Sensing element  : Silicon-based polymer, capacitance principle, IC electronics


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