White plastic enclosure with cutouts for air flow, 3 LEDs and white lens

CO2 sensor | wall mounting | LED indicators | 24 V DC

(Average rating 5 of total 2 reviews)

Product description

Temperature, relative humidity, CO2, and ambient light level sensors for HVAC systems. This carbon dioxide sensor is typically used to monitor the levels of carbon dioxide in schools, offices, restaurants, etc.

The CO2 level is visually indicated by the green, yellow, and red LED indicators. The LEDs used for status indication have adjustable light levels.

Through Modbus RTU communication and three analogue outputs, the measured values are transmitted. The output type by default is 0-10 Volt. Different output types are available. The ventilation system can be controlled based on the occupancy of the room using ambient light detection.

24 V DC is the supply voltage. Modbus RTU communication allows for the adjustment of all parameter settings.

Article code

RSMFF-3

GTIN

0.540.100.301.884.2

Additional specifications and description

Is there sufficient fresh air supply?
People produce CO₂ or carbon dioxide while breathing. That makes CO₂ concentration a good indicator for the occupancy and activity level in a space. The higher the occupancy or activity 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. Next to CO₂, this sensor also measures temperature, relative humidity and ambient light level. The measured temperature, relative humidity and CO₂ level are available via the three analogue outputs and via Modbus RTU communication. The dew point and ambient light level are available via Modbus RTU communication.

Three analogue outputs to transmit the measured values
This sensor has three analogue 0-10 Volt outputs. Each of them transmits one of the measured values. E.g. by default, output 1 will transmit 0 Volt at 0 °C and 10 Volt at 50 °C. Each output value varies proportionally in function of the measured temperature, humidity or CO₂ concentration. The measured temperature is available via output 1, relative humidity via output 2 and CO₂ concentration via output 3. By default the output type is 0-10 Volt. Other output types can be selected via de Modbus holding registers.

Visual indication of the measured value
This HVAC transmitter offers a clear, visual indication of the CO₂ level via the green, yellow and red LED. The green LED indicates that the CO₂ level is within range - there is sufficient fresh air supply. When the CO₂ level enters the alert range, the yellow LED lights up. Red means: CO₂ out of range or insufficient fresh air supply. The ranges can be adjusted via the Modbus holding registers. The LED indicators can visualize the status of one of the three measured values, by default CO₂.

4-wire connection
The cage clamp terminal blocks reduce wiring and installation time. They eliminate the need for routine maintenance and guarantee a reliable contact for solid or stranded wires. The supply voltage is 24 VDC. 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. Two wires for the supply voltage and (minimum) two wires to connect the output(s). 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.

Photoacoustic sensor element - ABC logic
Photoacoustic sensors are highly sensitive and specific, making them useful for the detection of various gases, such as pollutants, trace gases, and volatile organic compounds. The use of specific infrared wavelengths that correspond to CO2 absorption lines ensures that interference from other gases is minimised. 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.

Surface mounting
Sensor installed on wall socket This sensor can be installed indoors on a wall or on a surface. The mounting holes are adapted to standard European wall mounting boxes. The sensor can be attached to the wall mounting box with two screws. The sensor enclosure will cover the entire wall mounting box. To ensure optimal performance, the sensor should be protected from direct sunlight.

Enclosure with contemporary design
The enclosure is designed for indoor use. It offers an IP30 protection against ingress of dust and moisture. The enclosure is designed and manufactured in-house in Sentera Plastics. It is exceptionally strong thanks to the use of high quality r-ABS plastic. Thanks to its contemporary modern design, this sensor can be used in most interior styles.

∞ Monitoring air quality

How a CO2 sensor works