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  • Description
  • Characteristics
  • Downloads
  • Dimensions
  • Wiring plan
  • The sensor is designed for indoor carbon dioxide concentration measurement and respective air capacity regulation through the control output signal to the fan.
  • Air capacity control based on CO2 concentration is an efficient energy saving solution.
  • The sensor has two separate outputs: a normally opened dry relay contact and an analogue output 0…10 V (this output is adjustable for 2…10 V/0…20 mA/4…20 mA).
  • The relay output is used to turn the fan on/off depending on indoor CO- concentration and the analogue output is used for smooth fan speed control for a fan with EC-motor or a fan with extra speed controller with 0-10 V input, refer to RS...TA or VFED.
  • In case of smooth fan speed control the fan speed varies proportionally to carbon dioxide emissions.
  • The relay and analogue outputs make the sensor compatible with any ventilation system.
  • The integrated self-calibration system ensures reliable sensor operation during the sensor service life.
  • The sensor is available in two modifications: CO2-1 and CO2-2.
  • The CO2-1 model incorporates LED lights for CO2 concentration and operation buttons indicating the level of three operation modes: 1 – on, 2 – off, 3 – operation by CO2 concentration.
  • The button is used to switch the ventilation system on or off when CO2 - based ventilation control is not required.
  • The CO2-2 model has no LED-lights and on/off button.
  • The model is applied for premises requiring permanent ventilation, i.e. at school classes and other public premises.
  • The sensor is designed for wall surface mounting.
  • 24 VAC low current power supply.
  • If power supply 24 V is not available, connect the TRF plug that is offered as an accessory.
  • Power supply unit is applied for connection of the sensor to 220 V (model TRF-220/24-1,6) or 120 V (TRF-120/24-1,6) AC power mains.
Parameter CO2-1
Measurement unit
Power supply/ power consumption Power supply/ power consumption W
Gas detection analyzer Gas detection analyzer -
CO2 detection range CO2 detection range -
Accuracy at 25°С (77°F), 2000 ppm Accuracy at 25°С (77°F), 2000 ppm -
Response time Response time -
Warm up time for each turning-on Warm up time for each turning-on -
Analogue output Analogue output -
On/Off output On/Off output -
6 LED lights - CO2 indicators 6 LED lights - CO2 indicators -
Operating conditions/ storage recommendations Operating conditions/ storage recommendations -
Net weight/ Dimensions Net weight/ Dimensions kg
Mounting outdoor mounting -
Files archieve
Download high quality image "CO2-1" (psd 1.93Mb)
Download high quality image "CO2-2" (psd 1.89Mb)
Brochure "CO2" (pdf 507.83Kb)
User's manual "CO2-2" (pdf 240.9Kb)
User's manual "CO2-1" (pdf 244.85Kb)
Download image "CO2-1" for your website (png 380.44Kb)
Download image "CO2-2" for your website (png 341.78Kb)
Parameter Value Measurement unit
Wiring plan
Wiring plan

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Basic parameter for domestic fan selection