CO2 sensor

The sensor is designed for indoor carbon dioxide concentration measurement and respective air capacity regulation through the control output signal to the fan.

Application

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 compatability

The sensor has two separate ports. Relay normally opened dry contact and analogue output 0…10 V (this output is adjustable for 2…10 V/0…20 mA/4…20 mA). The relay output is designed to switch the ventilation systen on/off depending on CO2 concentration and the analogue output enables smooth fan speed control. Smooth fan speed control by CO2 sensor is possible only for the units equipped with EC motors or with an external fan speed controller with 0...10 V input, refer RS...TA or VFED. At smooth fan speed control the fan speed changes 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.

Modifications

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 for 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 operation 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 schools.

Mounting and power supply

The sensor is for wall surface mounting. Power supply from low-current 24 V ac. If power supply 24 V is not available, connect the TRF 24 AC plug that is offered as an accessory.

Accessories

Power supply unit TRF 24 AC is applied for connection of the sensor to 220 V or 120 V AC power mains.