Thermo FX-CO2

Fixed Carbon Dioxide Sensor

The FX-CO2 carbon dioxide gas sensor is suitable for indoor or outdoor use and provides an industry standard 4 to 20 mA output. Part of Thermo's FX line of gas transmitters, the FX-CO2 features a bright LED display of the current readings on the sensor itself.

Thermo's FX-CO2 sensor provides a reliable fixed CO2 monitoring point. The standard 4 to 20 mA output and operating voltage of 12 to 24 VDC is compatible with a variety of programmable logic controllers, distributive control systems, and Thermo's own line of controllers. It is available in two diffusion versions providing either a range of 0 to 5% or 0 to 1%. It comes housed in a rugged NEMA 4X enclosure and is suitable for indoor or outdoor use. In addtion to the 4 to 20 mA output a bright 4 digit LED display visible through the enclosure indicates current readings.


This sensor is compatible with Thermo's Safe T Net line of controllers, including the Safe T Net 100, Safe T Net 210, Safe T Net 410, and Safe T Net 2000.

Thermo FX-CO2 Gas Transmitter

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  • 67-0037-01FX-CO2, 0–5% volume
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  • 67-0037-02FX-CO2, 0–1% volume
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Thermo FX-C02 Calibration Kits

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  • 81-0212Calibration kit for FX-CO2, 0–5% version
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  • 81-0212-01Calibration kit for FX-CO2, 0–1% version
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Thermo FX-CO2 Accessories

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  • 33-0006Replacement filter for FX-CO2
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