• 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 (Field calibration also available if desired)
  • Lifetime CO2 calibration guarantee when using ABC Logic
  • Mounting plate with two-piece terminal blocks provides quick, easy wiring
  • Gas permeable, water resistant CO2 diffusion filter prevents particulate and water contamination of the sensor
  • Locking screw secures cover and sensor to the mounting bracket for tamper resistance.
  • Dual simultaneous analog outputs (V & mA) available for CO2
  • Sensors are shipped factory calibrated


The Telaire Ventostat T8002-ACD series are versatile, wall mount CO2 sensors with relay output for providing control functions even when a building management system is not in place. Consisting of two models, the T8002-ACD and the T8002-ACD-2K, these transmitters utilize non-dispersive infrared (NDIR) absorption technology to provide accurate carbon dioxide measurement in areas such as indoor growing areas, conference rooms, classrooms, meeting halls, etc.

The T8002-ACD has a measurement range of 0 to 5000 ppm with ±80 ppm accuracy (or 4% of the reading, whichever is greater). The T8002-ACD-2K has a range of 0 to 2000 ppm with ±40 ppm accuracy (or 3% of the reading). Both units offer a SPDT relay (normally open or closed) and can be custom programmed to a specific measurement and output range.

The Telaire Ventostat T8002-ACD series features a self-calibration program, ABC (Automatic Background Calibration) Logic, that virtually eliminates the need for manual calibration in applications where the indoor CO2 level drops to outside levels during unoccupied periods (e.g. during evening hours). ABC Logic is a special software routine in the sensor that remembers the background readings for 14 consecutive evenings, calculates if there is sensor drift, and then corrects for it. In applications not suitable for ABC Logic, such as space left unoccupied for less than four hours a day or where there are industrial sources of CO2 such as in breweries or wineries, the Ventostat offers flexibility for field calibration. Single-Point calibration using a reference sensor can be performed in less than 15 minutes using the keypad only.

The Telaire Ventostat T8002-ACD series can be connected to a PC using the UIP T2072 Windows program. Simply connect to the sensor using the onboard RJ45 jack and you can adjust the output scaling, elevation adjustment, relay setpoint, relay dead-band, select linear or proportional exponential output, perform single-point or two-point calibration, and check ppm levels. Display units can also be adjusted using the keypad.

Telaire Ventostat T8002-ACD CO2 Transmitter specifications:

Parameter T8002-ACD T8002-ACD-2K
Range 0 to 5000 ppm 0 to 2000 ppm
Accuracy ±80 ppm or 4% of reading ±40 ppm or 3% of reading
Non-Linearity < 1% of FS < 1% of FS
Stability < 100 ppm or 5% of the reading annually (with ABC Logic disabled) < 2% FS over the life of the sensor (with ABC Logic enabled)
Sensing Method Non-dispersive infrared (NDIR) absorbtion
Sample Method Diffusion
Temperature Dependence ±0.2% FS per °C (±0.11% per °F)
Pressure Dependence 0.13% of reading per mm Hg
Response Time < 2 minutes for 90% step change
Analog Output 0 to 10 VDC, 4 to 20 mA
Relay Output SPDT, 2 A maximum @ 24 V
Digital Output RS232