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White plastic enclosure with cutouts for air flow, 3 LEDs and white lens
White plastic enclosure with cutouts for air flow, 3 LEDs and white lens
White plastic enclosure with cutouts for air flow, 3 LEDs and white lens
White plastic enclosure with cutouts for air flow, 3 LEDs and white lens
White plastic enclosure with cutouts for air flow
White plastic enclosure with cutouts for air flow
Electronic circuit in black enclosure

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

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Product description

A transmitter for HVAC systems that measures temperature, relative humidity, CO2, and ambient light intensity. 24 V DC is used as the supply voltage. A visual indication of the CO2 level is given by the red, yellow, and green LED indicators. Utilising three analogue outputs and Modbus RTU communication, the measured values are transmitted. 0-10 Volt is the standard output type. One can choose from a variety of output formats. It's possible to swap out the CO2 sensor component.

In many applications, the ambient light detection is used to control the ventilation system in function of the occupancy of the room. Through Modbus RTU communication, every setting is programmable. The LEDs used to indicate status also have a variable light output.

This carbon dioxide sensor is typically used in places like schools, offices, restaurants, etc. to monitor the level of carbon dioxide and determine whether enough fresh air is being pushed into the room.

Article code
End of life approaching
Current stock
47 U.
Factory lead time
4 Week(s)

Additional specifications and description

Is there sufficient fresh air supply?
People produce CO2 or carbon dioxide when 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. The dew point and ambient light level are available via Modbus RTU communication.
Three analogue outputs to transmit the measured valuesWall mounted CO2 sensor
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. The 0-10 Volt outputs can be used to control an EC fan, a damper actuator or an AC fan speed controller.  
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 that the CO2  level is out of range or that there is insufficient fresh air supply. The ranges can be adjusted via the Modbus holding registers. The LED indicators can visualise the status of one of the three measured values, by default this is 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 V DC. 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 V DC supply voltage increases the safety and reliability of your installation.

Self-calibrating to account for sensor drift
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 NDIR CO2 sensor is self-calibrating. 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 week, 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
This sensor can be installed indoors on a wall or on a flat 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 developed 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.


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