Additional specifications and description
Photoacoustic sensing technology
People produce CO2 or carbon dioxide while breathing. That makes CO2 concentration a good indicator for the occupancy and activity level in a space. In many applications, CO2 sensors are used as an indicator for the ventilation requirements. This HVAC transmitter offers a clear, visual indication of the CO2 level via the green, yellow and red LED. The green LED indicates that the CO2 level is within range - there is sufficient fresh air supply. When the CO2 level enters the alert range, the yellow LED lights up. Red means that CO2 levels are too high or that there is insufficient fresh air supply. The measured temperature, relative humidity, CO2 and ambient light level are available via Modbus RTU. Photoacoustic sensing technology is used to measure the CO2 level. This makes the sensor very sensitive and specific, making it useful for the detection of various gases. The use of specific infrared wavelengths that correspond to CO2 absorption lines ensures that interference from other gases is minimised.
How to control fresh air supply?
This sensor's output can operate an EC fan, an AC fan speed controller or a damper actuator directly. The output value varies proportionally in function of the measured temperature, humidity and CO2 concentration. When more fresh air is required, the sensor will increase the fan speed or open the damper.
Easy to connect
The cage clamp terminal blocks simplify wiring and installation. They eliminate the need for routine maintenance and ensure a reliable contact for solid or stranded wires. This sensor can be powered by either 24 V DC or 24 V AC. It is designed for a three-wire connection. The output ground (GND) is internally connected to the supply voltage ground (V-). Make sure not to connect this common ground to any other DC-powered devices.
This sensor requires very little configuration. It is almost directly usable once it has been installed. Temperature and relative humidity are often region- and seasonal-specific. These parameters are still adjusted to the correct values during installation. The other default settings will be suitable for most applications. However, they can also be adjusted via the respective Modbus registers if necessary. A different output type, for example, can be selected to make it compatible with other devices: 0-10 VDC; 0-20 mA; 0-100% PWM; Modbus RTU. The light levels of the LEDs used for status indication are adjustable and you can choose to deactivate one or more measurement values. The Modbus register map provides an exhaustive list of all programmable settings.
Self-calibrating to compensate sensor drift
The ABC logic self-calibrating algorithm is by default enabled. This algorithm is designed to be used in applications where CO2 concentrations will drop to outside ambient conditions (400 ppm) at least one time (15 minutes) in a 7day period, which is typically seen during unoccupied periods. The sensor will reach its operational accuracy after 25 hours of continuous operation at a condition that it was exposed to ambient reference levels of air at 400 ppm ± 10 ppm CO2.
Wall mounting
The enclosure offers an IP30 protection against ingress of dust and moisture. It can be mounted on a wall indoors. To ensure optimal performance, it should be protected from direct sunlight.
∞ Monitoring air quality
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