Additional specifications and description
Photoacoustic sensing technology
Carbon dioxide, or CO2, is created by breathing. Because of this, CO2 concentration serves as a reliable gauge of a room's occupancy and activity level. CO2 sensors are used in many applications as a ventilation requirement indicator. The green, yellow, and red LED of this HVAC sensor controller provide a distinct, visual indication of the CO2 level. The green LED shows that there is enough fresh air supply and the CO2 level is within range. The yellow LED turns on when the CO2 level reaches the alert range. Red indicates either an out-of-range CO2 level or insufficient fresh air supply. Modbus RTU provides access to the measured temperature, relative humidity, CO2, dew point, and ambient light level. Photoacoustic sensors are highly sensitive and specific, making them useful for the detection of various gases, such as pollutants, trace gases, and volatile organic compounds. 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 a damper actuator, an AC fan speed controller, or an EC fan. In proportion to the measured temperature, humidity, and CO2 concentration, the output value changes. The sensor will speed up the fan or open the damper if more fresh air is needed.
Easy to connect
The cage clamp terminal blocks shorten installation and wiring times. They guarantee a dependable contact for solid or stranded wires and eliminate the need for routine maintenance. The supply voltage is 24 V DC. The power supply's (V-) and output's (GND) ground terminals are not connected internally. Therefore, a 4-wire cable is necessary to connect this sensor. Most 24 V DC power supplies provide protection against overload, short circuit, and overvoltage. The safety and dependability of your installation are increased by using a 24 V DC supply voltage.
Easy to use
Flush mounting or surface mounting
The enclosure provides IP30 protection from the entry of moisture and dust. It supports inset or surface mounting. It should be shielded from direct sunlight to ensure peak performance. This sensor can be installed in a typical European wall mounting box or on a flat wall. When flush mounted, only the front plate will be visible on the wall.
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 account for sensor drift
By default, the ABC logic self-calibrating algorithm is on. This algorithm is intended for use in situations where CO2 levels drop to outside ambient conditions (400 ppm) at least once (15 minutes) in a 7-day period, which is typically observed during unoccupied times. After 25 hours of continuous operation while being exposed to ambient reference levels of air at 400 ppm 10 ppm CO2, the sensor will reach its operational accuracy.
∞ Monitoring air quality