ODMFM-R

Measuring carbon dioxide (CO₂) in harsh environments can be challenging, but it is crucial for various applications, including industrial processes, environmental monitoring, and safety assessments. Harsh environments may include high temperatures, high pressures, corrosive atmospheres, or remote and hard-to-reach locations.
People and animals 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, CO₂ and ambient light level. Based on the temperature and humidity measurement, the dew point is calculated. All these values are available via Modbus RTU. The enclosure is designed for harsh environments or outdoor applications.

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. 

 

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. Once installed, it is almost directly ready to use. Temperature and relative humidity are frequently region- and season-specific. These parameters are still set to the correct values during installation. The other default settings are likely to be adequate for most applications. They can, however, be adjusted using the respective Modbus registers if necessary. The Modbus register map provides a complete overview of all adjustable settings. 

 

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 enclosure offers an IP65 protection against ingress of dust and water. Each sensor is calibrated and tested in our factory. We use sensor elements and components of high quality. This ensures the long-term stability and accuracy of this HVAC transmitter. To ensure optimal performance, the sensor should be protected from direct sunlight. To protect this sensor from too bright sun, rain or snow, we have designed a special cover cap – AWP-10-13-13 – that fits perfectly over the sensor, further ensuring its proper functioning.