CO2, Temp & RH Transmitter Duct Mount (CO2TD/RHT)

CO2, Temp & RH Transmitter Duct Mount (CO2TD/RHT)

The Flamefast Duct Mounted Carbon Dioxide, Temperature & Relative Humidity Transmitter offers an accurate and cost-effective solution for the HVAC market, with 0-10V outputs for CO2, Temp & RH levels.

Using the built in Volt Free Contact allows the unit to be easily interfaced with a variety of systems including Ventilation, Window Control and Gas Safety. The CO2TD offers four user selectable programs to cover various applications. Custom software profiles can also be provided to adjust the outputs as well as the relay configuration.

The relay can be configured to activate based on any combination of CO2, Temp & RH (CO2 only as default).


View FileCO2TD - CO2 Temp & RH Transmitter Duct Mount

Key Features

  • 24VAC/DC Power Supply
  • Volt Free Contact output based on CO2 (can be configured for Temp & RH)
  • Typical 15 year life expectancy
  • Self calibrating CO2 Sensor
  • 200mm Duct Probe

Technical Specification

Power Supply 24V AC/DC ±10%
Power Consumption 40mA
CO2 Range (0 - 10V) 0 - 2000 / 5000ppm
CO2 Accuracy ±50ppm +3% @NTP
CO2 Display Resolution 1ppm
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)
Sensing Method Solid State NDIR
Response Time (T90) 30 Seconds
Typical Sensor Life 15 Years
Sampling Method Diffusion
Warm-up Time < 1 min
IP Rating IP40
Housing Material Flame Retardant ABS
Approval CE


Height 152 mm
Width 110mm
Depth 50 mm
Probe Length 200 mm

Installer Selectable Options

The CO2TD has four factory set user selectable programmes to control the Volt Free Contact. These are as follows:

Program 1 2 3 4
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
CO2TD CO2 Transmitter
CO2TD-H CO2, Temp & RH Monitor
RHTD Temp & RH Transmitter
-L Adds a Traffic Light LCD to any of the above

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