Thermo FX-SMT

Fixed Gas Sensor

Thermo Scientific FX-SMT - Fixed Gas Sensor

The FX-SMT fixed single gas sensor is designed for use in hazardous areas to measure combustible gases, oxygen content, or various toxic gases. The FX-SMT is part of Thermo's FX line of gas transmitters, featuring a back lit LCD display.

The FX-SMT fixed gas sensor is available for combustibles (in either %LEL or ppm), oxygen, or various toxic gases. All sensors come pre calibrated from the factory for easy plug and play installation. The FX-SMT features programmable calibration reminders, a NEMA 4X enclosure, and a back lit LCD display. Signal output is an industry standard 4 to 20 mA and the sensor can be powered by a 10 to 28 VDC loop. Calibration is performed non intrusively via a magnetic wand.


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-SMT Available Sensors and Ranges

Gas Formula Range Resolution
Ammonia NH3 0 to 100 ppm 1 ppm
Carbon monoxide CO 0 to 500 ppm 1 ppm
Chlorine Cl2 0 to 10.0 ppm 0.1 ppm
Chlorine dioxide ClO2 0 to 2.00 ppm 0.01 ppm
Combustible 0 to 100% LEL 1% LEL
Oxygen O2 0 to 30.0% Volume 0.1% Volume
Sulfur dioxide SO2 0 to 20.0 ppm 0.1 ppm

Thermo FX-SMT Gas Transmitter

  • Part Number/Description
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  • 67-0021-01FX-SMT, Combustible
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  • 67-0024-01FX-SMT, CO
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  • 67-0024-02FX-SMT, H2S
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  • 67-0024-03FX-SMT, O2
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  • 67-0024-04FX-SMT, Cl2
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  • 67-0024-09FX-SMT, NH3
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  • 67-0024-17FX-SMT, SO2
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