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EU declaration conformity
Duct CO2 controller | 24 V DC
Product description
This CO2 sensor controller measures temperature, relative humidity, and CO2 (carbon dioxide) in air ducts.
The supply voltage is 24 V DC. The sensor algorithm controls the single analogue output based on the measured values. This single output can control an EC fan, an AC fan speed controller, or a damper actuator directly.
The output type is by default 0-10V but another output format can be chosen. Modbus RTU provides access to all measurements and the output value and can be used to change all of the settings. The CO2 sensor element is replaceable if necessary and self-calibrating.
Additional specifications and description
Why measuring CO2 is important
Measuring carbon dioxide (CO2) levels in buildings is essential for ensuring indoor air quality, comfort, and energy efficiency. Elevated CO2 levels can indicate poor ventilation, which can lead to health problems, discomfort, and decreased cognitive performance. 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 sensor controller measures temperature, relative humidity and CO2 in air ducts. Based on the temperature and humidity, the dew point is calculated. This sensor will function best if it is installed in a straight section of the air duct. Avoid installation in turbulent air zones nearby filters, fans, cooling coils, etc. Position the sensor correctly with respect to the airflow direction. Please consult the mounting instructions for more detailed information.
Measuring carbon dioxide (CO2) levels in buildings is essential for ensuring indoor air quality, comfort, and energy efficiency. Elevated CO2 levels can indicate poor ventilation, which can lead to health problems, discomfort, and decreased cognitive performance. 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 sensor controller measures temperature, relative humidity and CO2 in air ducts. Based on the temperature and humidity, the dew point is calculated. This sensor will function best if it is installed in a straight section of the air duct. Avoid installation in turbulent air zones nearby filters, fans, cooling coils, etc. Position the sensor correctly with respect to the airflow direction. Please consult the mounting instructions for more detailed information.
Demand based EC fan control
The sensor algorithm controls one output. This output can directly control an EC fan, an AC fan speed controller or a damper actuator. The output value varies proportionally in function of the measured temperature, relative humidity and CO2 level. E.g. as temperature, relative humidity or CO2 level approaches their maximum limit, fan speed will increase or the damper will open. NDIR or Non-dispersive Infrared technology is used to measure the CO2 level. This technology offers a low life-cycle cost and a precise and stable long-term operation.
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 V DC; 0-20 mA; 0-100% PWM; Modbus RTU.
4-wire connection
The supply voltage is 24 V DC. The ground terminals of the power supply (V-) and output (GND) are internally not connected. This means that a 4-wire cable is required to connect this sensor. Most 24 VDC power supplies include short circuit, overload and overvoltage protection. A 24 V DC supply voltage improves the safety and dependability of your installation
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 once (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.
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 once (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.
Air ducts
The enclosure is optimised for CO2 measurements in air ducts. It offers an IP54 protection against ingress of dust and moisture. The sensor element is integrated in the probe of the duct sensor. This probe has an opening to have a direct contact between the air flow and the sensor element. The sensor probe itself offers an IP20 protection.
∞ Monitoring air quality
The enclosure is optimised for CO2 measurements in air ducts. It offers an IP54 protection against ingress of dust and moisture. The sensor element is integrated in the probe of the duct sensor. This probe has an opening to have a direct contact between the air flow and the sensor element. The sensor probe itself offers an IP20 protection.
∞ Monitoring air quality
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