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EU declaration conformity
CO2 Controller | Duct | 24 VAC-VDC
Product description
DCMFG-2R is a controller for measuring and regulating CO2, temperature, and relative humidity in air ducts. The dew point delta is calculated based on temperature and humidity measurements.
The controller operates on a 24 VAC or 24 VDC power supply and generates one analogue output that can directly control an EC fan, an AC fan speed controller, or a damper actuator. All measured values and settings are accessible via Modbus RTU communication.
The enclosure is made of premium plastic and provides an IP54 protection. The duct sensor probe has an IP20 protection rating.
Additional specifications and description
Which parameters are measured and why is it important?
This controller measures and regulates CO2, temperature, and relative humidity in air ducts. The dew point is calculated based on temperature and humidity measurements.
Carbon dioxide (CO2) is primarily generated by human respiration and is therefore a reliable indicator of room occupancy and activity level in indoor spaces. The higher the CO2 level, the more fresh air supply is required to maintain good indoor air quality. That is why in many applications, CO2 sensors are used as an indicator for the ventilation requirements. The Sentera duct sensors measure CO2 based on the nondispersive infrared (NDIR) sensing technology. The CO2 sensors do not require (re)calibration since the Automatic Baseline Correction (ABC) algorithm is enabled by default.
What are the configuration and customisation options?
This sensor requires little configuration and can be used almost immediately once it has been installed. Temperature and relative humidity can vary depending on the region and season, these parameters are set to the correct values during installation. The other default settings are typically suitable for most applications, however, they can also be adjusted, if necessary. The Modbus register map provides a complete overview of all adjustable settings.
The algorithm controls one analogue output — based on measured values — that can directly control an EC fan, an AC fan speed controller, or a damper actuator. The output value changes in direct proportion to the measured CO2 concentration, temperature, or relative humidity. By default, the output type is 0–10 V, but a different output type can be selected to make it compatible with other devices: 0–20 mA, 0–100%, PWM, or Modbus RTU.
How is the sensor installed, and what are the power and connectivity requirements?
The sensor is designed for installation in rectangular or circular air ducts. The black mounting flange simplifies installation onto circular ducts. For optimal performance, place the sensor in a straight section of the duct. Avoid installing near filters, fans, cooling coils, or other sources of turbulent airflow. Make sure the sensor is positioned correctly according to the airflow direction. For more information, please refer to the mounting instructions.
The supply voltage is 24 VAC or 24 VDC. The ground terminals of the power supply (V-) and output (GND) are internally connected. This means that a 3-wire cable is required to connect this controller. Make sure not to connect this common ground to other devices that are powered by a DC voltage. A 24 VDC supply voltage increases the safety and reliability of your installation, by offering protection against short circuit, overload and overvoltage.
The spring contact terminal blocks simplify installation and reduce wiring. They eliminate the need for routine maintenance and guarantee a reliable contact for solid or stranded wires.
What are the manufacturing quality and protection ratings?
All sensors are designed and manufactured in Europe. Each device is calibrated and tested in our factory. Only high-quality components are used, ensuring long-term stability and accuracy.
The enclosure is produced in-house by Sentera Plastics from premium ABS, providing exceptional strength and durability. The enclosure offers an IP54 protection against ingress of dust and moisture. The sensor element is housed within the duct sensor probe, which has an IP20 protection rating. The probe includes an opening that allows airflow to come into direct contact with the sensor element.
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