Ventostat Pitot Duct Mount Controller

Ventostat Pitot Duct Mount Controller

The Telaire Ventostat® CO2 sensors are ideally suited for demand controlled ventilation (DCV) in buildings.

The T8300 series sensor measures CO2 concentrations and can be utilized as an indicator of occupancy. This approach drives a ventilation control strategy based on actual occupancy while maintaining ASHRAE recommended per-person ventilation rates. Over-ventilation can be reduced, energy can be saved, and air quality can be optimized by including the Ventostat® CO2 sensor in your next project.

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• 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

• Lifetime CO2 calibration guarantee when using ABC Logic™

• Mounting plate with two-piece terminal blocks provide 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

• Temperature sensor on all models

• Modern enclosure with customized branding available


The sensors mount directly inside the return air duct to control an entire air handling zone.




Sensing Method

• Non-dispersive infrared (NDIR) absorption

• Gold-plated optics

• Patented ABC Logic self calibration algorithm

CO2 Measurement Range

T8100/T8300 - Single Channel

0 to 2000 ppm

0 ppm = 0 V, 4 mA

CO2 Accuracy

T8300 • 400-1250 ppm ±30 ppm or 3% of reading, whichever is greater*,**

• 1250-2000 ppm ±5% of reading + 30ppm *, **

*Tolerance based on span gas of ±2%

** ABC Logic not deactivated

Power Supply Requirements

18-30 VAC RMS 50/60 Hz

Power Consumption

Typical 0.7 W at nominal voltage of 24V AC RMS

Temperature Dependence

0.2% FS per °C


T8300 - Single Channel

<2% of FS over life of sensor (15 years)

Pressure Dependence

0.135% of reading per mm Hg


One year on mechanical defects


CE and RoHS compliant

Signal Update

Every 5 seconds

CO2 Warm-up Time

• < 2 minutes (operational)

• 10 minutes (maximum accuracy)

Operating Conditions

• 0°C to 50°C

• 0 to 95% RH, non-condensing

Storage Conditions

-40°C to 70°C

Flammability Classification

UL94 5VA




• 0 to 10 V (100 W output impedance) and

• 4 to 20mA (RL maximum 500 W) available simultaneously

• Digital to Analog error ±1%

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