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EU declaration conformity
CO2 sensor | wall mounting | LED indicators | PoM
Product description
Temperature, relative humidity, CO2, and ambient light level are all measured by this room sensor. The CO2 level is visually indicated by the green, yellow, and red LED indicators. Modbus RTU communication is used to transmit the measured values. The CO2 sensor element can be replaced.
The power supply is 24 V DC PoM. This means that one RJ45 connector can connect Modbus RTU communication and a 24 V DC power supply. Ambient light detection is used in many applications to control the ventilation system based on the occupancy of the room. Modbus RTU communication allows for the adjustment of all settings. The light intensity of the LEDs used for status indication can also be adjusted.
This sensor is typically used in buildings to monitor CO2 levels and to ensure that adequate fresh air is supplied into the room. This CO2 sensor is commonly found in schools, office buildings, and restaurants.
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, CO2 level, dew point temperature and ambient light level are available via Modbus RTU communication.
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.
Visual indication of the measured value
This HVAC transmitter offers a clear, visual indication of the CO2 level via the green, yellow and red LEDs. 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 CO2 levels are too high or that there is insufficient fresh air supply. The ranges can be adjusted via the Modbus holding registers. The LED indicators can show the status of one of the three measured values, which is set to CO2 by default.
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 UTP cable - we call it Power over Modbus or PoM. All measured values are available via Modbus RTU communication. To facilitate wiring, we recommend to use the Sentera 24 V DC power supplies with RJ45 connector. These power supplies offer protection against short circuit, overload and overvoltage. A 24 V DC supply voltage increases the safety and reliability of your installation.
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, CO2 level, dew point temperature and ambient light level are available via Modbus RTU communication.
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.
Visual indication of the measured value
This HVAC transmitter offers a clear, visual indication of the CO2 level via the green, yellow and red LEDs. 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 CO2 levels are too high or that there is insufficient fresh air supply. The ranges can be adjusted via the Modbus holding registers. The LED indicators can show the status of one of the three measured values, which is set to CO2 by default.
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 UTP cable - we call it Power over Modbus or PoM. All measured values are available via Modbus RTU communication. To facilitate wiring, we recommend to use the Sentera 24 V DC power supplies with RJ45 connector. These power supplies offer protection against short circuit, overload and overvoltage. A 24 V DC supply voltage increases the safety and reliability of your installation.
Photo-acoustic NDIR sensor element - ABC logic
Photo-acoustic 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 corresponding to the absorption lines of CO2 ensures that interference from other gases is minimised.
In contrast to transmissive NDIR sensors, photoacoustic NDIR sensors measure the energy absorbed by CO2 molecules. When the infra-red emitter is pulsed, CO2 molecules absorb infrared light on a regular basis. This causes additional molecular vibration, which results in a pressure wave within the measurement chamber. The higher the concentration of CO2, the more light is absorbed, and thus the amplitude of the acoustic wave increases. A microphone inside the gas chamber detects this, and the CO2 concentration can then be calculated. Photoacoustic NDIR sensing allows for much more miniaturisation of the measurement chamber. Furthermore, because sound waves are omnidirectional, the relative position of the emitter and microphone is unconstrained. Thus, photoacoustic NDIR sensors are typically more mechanically and thermally robust.
The self-calibrating algorithm ABC logic is enabled by default. This algorithm is designed to be used in applications where CO2 concentrations drop to outside ambient conditions (400 ppm) at least once (15 minutes) in a 7-day period, which is typically seen during unmanned periods. The sensor reaches its operational accuracy after 25 hours of continuous operation at a condition where it is exposed to ambient reference levels of air with 400 ppm ± 10 ppm CO2.
Surface mounting 
This sensor can be mounted on a wall or a surface indoors. The mounting holes are designed to accommodate standard European wall mounting boxes. Two screws are required to secure the sensor to the wall mounting box. The sensor enclosure will completely enclose the wall mounting box. To ensure peak performance, keep the sensor out of direct sunlight.
Enclosure with contemporary design
The enclosure is intended for indoor use only. It has an IP30 rating for dust and moisture protection. Sentera Plastics designed and manufactured the enclosure in-house. It is extremely durable due to the use of high-quality r-ABS plastic. This sensor can be used in most interior styles due to its contemporary modern design.
∞ Monitoring air quality
This sensor can be mounted on a wall or a surface indoors. The mounting holes are designed to accommodate standard European wall mounting boxes. Two screws are required to secure the sensor to the wall mounting box. The sensor enclosure will completely enclose the wall mounting box. To ensure peak performance, keep the sensor out of direct sunlight.
Enclosure with contemporary design
The enclosure is intended for indoor use only. It has an IP30 rating for dust and moisture protection. Sentera Plastics designed and manufactured the enclosure in-house. It is extremely durable due to the use of high-quality r-ABS plastic. This sensor can be used in most interior styles due to its contemporary modern design.
∞ Monitoring air quality
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