DewPro MMY31 Dew Point Transmitter

  • Planar Aluminum Oxide Sensor Corrosion resistant, low temperature coefficient, fast response
  • Optional Integrated Display With User Interface Provides full programming & diagnostic capability
  • Integral Flow Cell for Filtration & Flow Regulation Ideal for monitoring moisture content
Product Options


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.

Manufactured by: Panametrics
Model: DewPro MMY31 Dew Point Transmitter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Environmental chambers
Test chambers
Gloves boxes


Sensing element Planar aluminum oxide sensor
Measurement range -130°F to 50°F (-90°C to 10°C) dew point temperature; 0 to 10 ppmv, 0 to 1000 ppmv (fully adjustable with integral display)
Recommended recalibration cycle 12 months, depending on the application
Calibration accuracy ±3.6°F (±2°C) dew point at 77°F (25°C)
Maximum sensor relative humidity 50% at dew point temperatures >32°F (>0°C)
Operating temperature range Process: -40°F to 122°F (-40°C to 50°C)
Electronics: -40°F to 185°F (-40°C to 85°C)
Element filter 100 micron, sintered stainless steel
Standard operating pressure 0 to 1750 psig (0 to 120 bar, 12 MPa)
Helium leak-rate <10-6 mbar/s
Output 4 to 20 mA loop-powered, 16 μA resolution
Electronics Microcontroller operated
Optional display Four-digit numeric display with bar graph and matrix position indication; four user interface keys for unit selections, output adjustments and ranging
Power supply 24 VDC nominal, 12 to 30 VDC
Protection Type 4X/IP67
Weight 3.3 lb (1.5 kg)
Probe tube 316 stainless steel, 1/2 in. (12.7 mm) diameter, insertion length 2 in. (50 mm) to 3.5 in. (90 mm)
Typical probe mounting 1/2 in NPT-M, 3/4 in NPT-M, 3/4-16 O-ring, G 1/2 compression fittings. Others available, consult factory.
European compliance Complies with EMC Directive 89/336/EEC and PED 97/23/EC for DN<25
Optional certifications/approvals
  • FM IS Class I,II,III, Division 1, Groups A,B,C,D,E,F&G, T5
  • FM XP-IS Class I, Division 1, Groups A,B,C&D, T5
  • FM NI Class I, Division 2, Groups A,B,C&D, T4A DIP Class II,III, Division 1, Groups E,F&G, T5
  • ATEX II 3G EEx nA IIC T4