Amphenol Telaire T8041/T8042 Ventostat CO2 Duct Probe Transmitter

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CO2 Duct Probe Transmitter 

The Telaire Ventostat T8041/T8042 CO2 Duct Probe Transmitter is suitable for indoor air quality and energy conservation applications, offering accuracy and versatility at an affordable price. This exceptional product line touts an unobtrusive form factor that is easy to install, simple to use, and remains accurate over the expected life of the device using Telaire’s patented ABC Logic™ (Automatic Background Calibration) technology.


  • Simple installation (mounting hardware and instructions included)
  • Ideally suited for larger HVAC return air ducts
  • Offers standard 0-10 volt output Patented absorption infrared/gas sensing engine provides high accuracy in a compact low cost package
  • Patented ABC Logic™ self-calibration system eliminates the need for manual calibration in most applications
  • Gas permeable, water resistant diffusion filter prevents particulate and water contamination of the sensor
  • Lifetime calibration guarantee
  • Two probe lengths available

Data Sheet




T8041, T8042

Temperature Dependance

0.2% of full scale per ºC


±40 ppm +3% of reading @ 22ºC (72ºF) when compared with a factory certified reference

Pressure Dependence

0.13% of reading per mm of mercury

Response Time

3 minutes typical for a 90% step change at low duct speeds

Sampling Rate

Every two seconds, 25% duty cycle

Operating Conditions

Humidity: 0 to 95% relative humidity, noncondensing, Temperature: 0ºC to 50ºC (32ºF to 122ºF)

Storage Conditions

-20ºC to 70ºC (-40ºF to 158ºF)