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Features • 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 DewPro ® MMY31 Dew Point Transmitter The DewPro MMY31 measures dew point or ppm v 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. Options • Integrated display with user interface • FM approved intrinsically safe/explosion-proof Class IIIIII Division 1 and 2 Groups ABCDEFG hazardous classified locations • English or metric fittings • External display available with loop-power supply and alarm contacts GE Oil Gas

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DewPro MMY31 Specifications Sensing Element Planar aluminum oxide sensor Measurement Range -130°F to 50°F -90°C to 10°C dew point temperature 0 to 10 ppm v 0 to 1000 ppm v 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 DN25 Optional Certifications/Approvals • FM IS Class IIIIII Division 1 Groups ABCDEFG T5 • FM XP-IS Class I Division 1 Groups ABCD T5 • FM NI Class I Division 2 Groups ABCD T4A DIP Class IIIII Division 1 Groups EFG T5 • ATEX II 3G EEx nA IIC T4 3.11 79.0 5.44 138.0 5.953 150.9 9.41 238.9 0.5 12.7 Optional sintered end cap Epoxy-coated cast aluminum housing that meets Type 4X/IP67 requirements M20 or 1/2 in. NPT conduit or cable gland Note: all units in. mm DewPro MMY31 with Display Option 920-065B © 2016 General Electric Company. All Rights Reserved. Specifications are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product names mentioned in this document may be trademarks or registered trademarks of their respective companies which are not affiliated with GE.