Vents Diffuser A100VRF (100mm) ฿480.00 ฿329.00 Incl VAT
CO2 Sensor CO2-2 ฿12,150.00 Incl VAT


  • 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.

Design and compatibility 

  • 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.

Order item, 6-8 weeks

In Stock

฿12,450.00 Incl VAT

  • 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.
  • 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.
  • 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.


Parameter СО2-1 Measurement unit
Power supply/ power consumption Power supply/ power consumption 24 VAC (50/60 Hz ± 10%), 24 VDC/1.6 W Max W
Gas detection analyzer Gas detection analyzer Non-dispersive infrared detector (NDIR) with self-calibration system
CO2 detection range CO2 detection range 0–2,000 ppm (parts per million)
Accuracy at 25°С (77°F), 2000 ppm Accuracy at 25°С (77°F), 2000 ppm ±30 ppm + 3 % of reading
Response time Response time max. 2 min
Warm up time for each turning-on Warm up time for each turning-on 2 hours (first time), 2 minutes (operation)
Analogue output Analogue output 0-10 VDC (factory setting), 4-20 mA (selectable by jumpers)
On/Off output On/Off output 1X2A switch load. Four set points selectable by jumpers
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

Wiring plan 


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