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Duct CO2 controller | PoM

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Article code DCMFM-2R
GTIN 0.540.100.300.069.4
Intrastat number
Category Duct CO2 controllers
Current stock 0 U.
Factory lead time 4 Week(s)

Product description

Temperature, relative humidity, and CO2 (carbon dioxide) in air ducts are measured by this duct CO2 transmitter.

The power supply voltage is 24 V DC PoM, which means that Modbus RTU communication and a 24 V DC power supply can be connected using a single RJ45 connector. Modbus RTU communication allows the sensor algorithm to control an EC fan, an AC fan speed controller, or a damper actuator directly. It provides access to all measurements and the output value and can be used to change all of the settings.

The CO2 sensor element can be replaced if necessary.

Additional specifications and description

Why is measuring CO2 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. Probe in tubePeople 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 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.
How does it work?
The sensor algorithm controls 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. The control output is available via Modbus RTU communication. 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.

No analogue outputs - only Modbus RTU communication
This sensor does not have analogue outputs which makes it simpler and more cost efficient. All measured values are available via the Modbus input registers of this sensor. Reading the measured values is possible via SenteraWeb - our online HVAC platform, via 3SModbus software, via a BMS system or via another Modbus master device. Modbus has numerous advantages. The most important ones are that digital signals are less susceptible to interference than analogue signals and that longer cables can be used. Cable lengths of up to 1.000 meters are possible. 
Reduced installation time
One RJ45 connector is all it takes to connect this sensor. Modbus RTU communication and 24 V DC power supply are connected via one cable - we call it Power over Modbus or PoM. All measured values are available via Modbus RTU communication. Most 24 V DC power supplies offer protection against short circuit, overload and overvoltage. A 24 V DC supply voltage increases the safety and dependability of your installation.
Easy to use
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. You can for instance change the range for temperature, humidity and CO2.
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.
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 

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