Grey plastic enclosure with duct probe and black mounting flange

Duct CO2 controller, PoM

Name: Duct CO2 controller, PoM
Brand: Sentera
SKU: DCMFM-2R
Price: 286 Eur
Availability: InStock

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Product description

Duct CO2 transmitter to measure temperature, relative humidity and CO2 (carbon dioxide) in air ducts. The supply voltage is 24 VDC PoM - this means that Modbus RTU communication and 24 VDC power supply can be connected via one RJ45 connector. The sensor algorithm can directly control an EC fan, an AC fan speed controller or a damper actuator via Modbus RTU communication. All measurements and the output value are available via Modbus RTU. The CO2 sensor element is replaceable. All settings can be adjusted via Modbus RTU.

Article code

DCMFM-2R

GTIN

0.540.100.300.069.4

Additional specifications and description

Optimised for air ducts
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 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.

Reduced installation time

One RJ45 connector is all it takes to connect this sensor! Modbus RTU communication and 24 VDC 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 VDC power supplies offer protection against short circuit, overload and overvoltage. A 24 VDC supply voltage increases the safety and reliability of your installation.

Easy to use!

This sensor doesn't require configuration. Once installed, it is ready to use. The default settings will do for most applications. If necessary, the settings can be adjusted via Modbus RTU. For example, the temperature, relative humidity or CO₂ range can be adjusted via Modbus RTU. The Modbus register map provides a complete overview of all adjustable 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.

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 offers an IP20 protection.