O2 Monitor – Model M60

The Model M60 is designed to monitor PPM and percent level O2concentrations in natural gas applications. An electro-chemical O2sensor is incorporated into the design of the instrument. The M60 can be included as an additional measurement with other Envent analyzers, or can be offered as a stand-alone analyzer with an integrated sample conditioning system.


  • Electro-chemical sensor
  • Dual alarm outputs
  • Low power consumption
  • Two Line LCD Display
  • 4 to 20 mA output
  • RS-232 and RS-485 configurable Modbus communications

Enclosure Class 1, Div 1 Groups C&D
Operating Principle Electro-chemical sensor
Power 12-24 VDC Standard
120/240 VAC optional.
Measurement Range 0-2000 ppm to 0-25%
Repeatability 2% of full scale (%) 5% of full scale (ppm)
Warm Up Less than 10 minutes
Operating Temperature 10-50˚C (50 to 122 F)
Analog Output Isolated 4-20 mA
Communications Configurable Modbus RTU.
Alarm Outputs 2 solid state driver, 3 Amps max.
Optional Sample System Inlet filter, pressure regulator, flow meter, calibration port.
Accuracy 2% of full scale.


Oxygen in natural gas gathering pipelines sometimes need to be monitored to ensure streams do not exceed maximum allowed concentrations of oxygen. Common ranges are from 0 to 2,000 ppm and 0 to 25%. Vapour recovery systems where inlet compression pressures are sub-atmospheric, are susceptible to air infiltration and oxygen concentration monitoring serves as an early warning. Storage tank blanket gas and other head space applications frequently require oxygen monitoring for safety reasons.