CO2, VOC, Temp & RH Transmitter (CO2T) 24V

CO2, VOC, Temp & RH Transmitter (CO2T) 24V

The Flamefast Carbon Dioxide, VOC (Volatile Organic Compounds), Temperature and Relative Humidity transmitter offers an accurate and cost-effective solution for the HVAC market, with 0-10V outputs for CO2, VOC, Temp and RH Levels (outputs depend on model selection). When both CO2 and VOC levels are being measured, the unit will display/output the higher of the two concentrations as the VOCs are measured in CO2 equivalent for easy interpretation.

Using the built-in Volt Free Contact, the unit can be easily interfaced with Ventilation and Window Control Systems, as we as Gas Safety Systems. The unit can also simply be used as a traffic light indication to raise awareness of CO2, VOC, Temp or RH levels.

The unit offers four user selectable programmes for different applications; two aimed at Ventilation and a further two aimed at Gas Safety. Custom software profiles are also available to control the relay set point and the traffic light changeover levels, based on any combination of CO2, VOCs, Temp & RH (CO2/VOC as default).


View FileCO2, VOC, Temp & RH Transmitter (CO2T) 24V

Key Features

  • 24V AC/DC Power Supply
  • Low power consumption
  • Pluggable terminal block for ease of installation
  • Optional digital readout
  • Optional traffic light indication
  • 3x 0-10V outputs (full-scale linear)
  • Volt free contact output
  • Typical 10 year life expectancy
  • Self-calibrating CO2 and VOC sensors
  • Mounts onto any standard single gang junction box or conduit box

Technical Specification

Power Supply 24V AC/DC ±10%
Power Consumption 50mA Max
CO2 Range (0 - 10V) 0 - 2,000 / 5,000ppm
CO2 Accuracy ±50ppm +3% @NTP
CO2 Display Resolution 1ppm
CO2 Sensing Method Solid State NDIR
CO2 Response Time (T90) 30 seconds
CO2 Typical Sensor Life 10 years
VOC Range (CO2 Equivalent) 400-2,000ppm
VOC Accuracy ±5% @NTP
VOC Display Resolution 1ppm
VOC Sensor Type Semiconductor
Temp Range (0-10V) 0 - 50°C
Temp Accuracy ±0.3°C @ 20 - 40°C
Temp Display Resolution 0.1°C
RH Range (0-10V) 0 - 100%
RH Accuracy +/-2% @ 20 - 80%
RH Display Resolution 0.1%
VFC Output Rating SPST - 100mA @ 24V Max
Operating Conditions Temp 0°C to 50°C
Humidity 0 to 95% (NC)
Sampling Method Diffusion
Warm-up Time 30 seconds
IP Rating IP40
Housing Material Flame Retardant ABS
Approval CE


Height 125 mm
Width 86 mm
Depth 36 mm

Installer Selectable Options

  • Backlight (Enable/Disable)
  • Traffic Light changeover levels and Volt Free Contact activation
  • Display Options:
    • On standard Model - replace PPM reading with 'CO2'
    • On -H model - remove RH readout

The CO2T has four factory set user selectable programmes to control the Volt Free Contact and LCD Traffic Light behaviour.

These are as follows:

Program 1 2 3 4
Green - Yellow 1,000 1,000 1,500 1,500
Yellow - Red 1,500 1,500 2,800 2,800
Relay Position N/O N/O N/C N/C
Relay Set Point   1,000 1,500 2,800 4,500
CO2 Range 2,000 2,000 5,000 5,000

Custom programs available on request

Part Numbers & Options / Accessories

Part No Description
CO2T CO2 Transmitter
CO2T-H CO2, Temp & RH Transmitter
CO2T-V CO2 & VOC Transmitter
CO2T-VH CO2, VOC, Temp & RH Transmitter
CO2T-P CO2 & Temp Transmitter (10K3)
-L Adds a Traffic Light LCD to any of the above

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