Posted in | Gas Sensors

CM-902 O2 Industrial Gas Detector

The CM-902 O2 Industrial Gas detector protects individuals working in confined spaces near hazardous gases like argon, nitrogen, or helium. This device also features an industrial enclosure for harsh environments and wash-down applications.


  • 4-20 mA to communicate with the Building Management System (BMS)
  • Designed to meet CGA, OSHA, and NIOSH standards for gas safety
  • Provides instant audible and visual alarms of potential leaks
  • Monitors 0-23% O2 measurements
  • User configurable 3-relays dependent upon application
  • 1-year warranty


  • Alarms: 19.5%, 16.5%, and 12% O2 (configurable)
  • Alarm Relays: 3
  • Alarm Response Time: < 60 seconds
  • Accuracy: +/-200 ppm or +/-10% reading 
  • Calibration: Manual with test gas or factory calibration
  • Dimensions: 8.25 in x 6.25 in x 3 in
  • O2 Measurement Range: 0-23%
  • Operating Temperature: -50 °C to 50 °C (-58 °F to 122 °F) (O2)
  • Pressure Dependence: built-in barometer (50 to 110 kPa)
  • Response Time: <2 minutes by 90% 
  • Warm-Up Time: <60 seconds at 22 °C 
  • Weight: 1.5 lbs (monitor only)
  • Sensor Life Expectancy: >15 years
  • Sound Alarm: 80 db@10 cm 


  • 24 VDC hard-wired power option (cable included)
  • 6 VDC battery backup connections
  • Power Supply: 110-220 VAC 50/60 Hz to 12 VDC Power Adapter
  • Power Consumption: 3 Watts
  • Relays: Peak Current < 2 A @ 30 VDC or 250 VAC, SPDT
  • Relay Color Coding: 
    • Blue & White = Normally Closed
    • Red & White = Normally Open


The CM-1027 add-on kit comes with cables and two extension strobe lights.


  • CM-900: CO2 Industrial Gas Detector
  • CM-902-CON: O2 Industrial Gas Detector Connector
  • CM-902-CBL: O2 Industrial Gas Detector Cable
  • CM-1029: Industrial Siren Strobe

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