Critical Environment

Carbon Dioxide Transmitters


The AST series Carbon Dioxide transmitters are durable, reliable analog signal transmitters for CO2 gas detection in Indoor Air Quality or industrial applications. CO2 is used as an indicator for IAQ in office areas and can be used to control supplied ventilation. Typical industrial applications include fermentation areas in wineries or breweries and other beverage plants. They are used with CET controllers or by sending a signal directly into a Building Automation System. CET CO2 transmitters use infrared sensor technology.

AST-ICD for Industrial CO2 detection



Linear 4 - 20 mA output
Operating power 24 VDC nominal
Watertight Polycarbonate enclosure
Simple calibration procedure
0 – 5.0% volume standard range
Other ranges available

AST-IT series for Indoor Air Quality



Linear 4 - 20 mA or 0 – 10 VDC output
Operating power 24 VDC or 24 VAC nominal
Attractive office mount enclosure
Lifetime calibration
0 – 2000 ppm standard range
Standard relay
Optional digital display
Optional duct mount kit


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