Model OT-3 Natural Gas Oxygen measurement

The OT-3 is designed to accurately monitor the oxygen content in a wide variety of gases at the ppm level.

The transmitter is equipped with two oxygen analysis ranges (0-100 and 0-1000 ppm) and is acceptable for operation in Class I, Division 2, Groups B, C, and D hazardous environments when used in conjunction with a non-incendive power source such as the Elsag Baily Total Flow System.

The OT-3 is designed to work with TotalFlow model 6713, one of the predominant FCUs in the industry. Moreover, the system operates at as low as 9 VDC.

The heart of the OT-3 system is Teledyne’s own Micro-fuel Cell oxygen sensor. This cell is a sealed electrochemical device which translates the amount of oxygen present in a sample into an electrical current. Since it is sealed, there is no electrolytes to change or electrodes to clean, and is therefore virtually maintenance free.

The OT-3 System is housed in a metal NEMA-4 case with the display visible through a clear Lexan window. For access to the Micro-fuel Cell and transmitter controls, the front door swings open.


  • Two analysis ranges, user selectable, 0-100 and 0-1000 ppm
  • Designed to work with TotalFlow model 6713, one of the predominant FCUs in the industry
  • Operates at as low as 9 VDC
  • High sensitivity (0.5% FS)
  • High accuracy (+/- 2% of full scale at constant temperature)
  • Insensitive to flow variations
  • Fast response and recovery
  • Long, life maintenance free Micro-fuel Cell sensor
  • Unaffected by reducing agents (HC’s, CO, SO2, etc.)
  • Easy to calibrate, no zero gas required
  • Rugged NEMA-4 bulkhead mount enclosure
  • Stainless steel sample system (nylon cell holder)
  • H2S scrubber


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