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EU declaration conformity
CO2 Sensor | Wall mounting | PoM
Product description
This room sensor measures temperature, relative humidity, CO2, and ambient light. It provides a visual indication of CO2 levels with green, yellow, and red LED indicators.
For connectivity, the sensor uses Modbus RTU for data transmission and is powered by 24 VDC PoM (Power over Modbus). This setup allows for a single RJ45 connector to handle both power and communication.
The integrated ambient light sensor can be used to control ventilation based on room occupancy.
All settings, including the intensity of the LED lights, are adjustable via Modbus RTU. The CO2 sensor element is replaceable, making maintenance simple. This sensor is commonly used in schools, offices, and restaurants to monitor CO2 and ensure an adequate supply of fresh air.
Additional specifications and description
Which parameters are measured and why is it important?
This room sensor measures CO2, temperature, relative humidity, and ambient light. The ambient light sensor can be used in applications to control the ventilation system based on the occupancy of the room. The dew point is calculated based on the temperature and humidity measurements. All measured values can be accessed via Modbus RTU communication.
Carbon dioxide (CO2) is primarily generated by human respiration and is therefore a reliable indicator of room occupancy and activity level in indoor spaces. The higher the CO2 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. The Sentera room sensors measure CO2 based on the photoacoustic spectroscopy (PAS) sensing technology. The CO2 sensors do not require (re)calibration since the Automatic Baseline Correction (ABC) algorithm is enabled by default.
What are the configuration and customisation options?
This sensor has no analogue outputs, which makes it simpler and more cost efficient. All measured values can be accessed through the Modbus input registers. They can be read via SenteraWeb — our online HVAC platform — through 3SModbus software, a BMS system, or any other Modbus master device. Modbus offers several advantages. Digital signals are less prone to interference than analogue signals and much longer cables — up to 1000 meters — can be used.
The sensor offers a clear, visual status indication of one of the measured values via the green, yellow and red LED light. By default, this is set to CO2. The green LED indicates that the CO2 level is within range, which means there is sufficient fresh air supply. Yellow signals the alert range, and red indicates that CO2 levels are too high and/or that there is insufficient fresh air supply. The light intensity of the LEDs used for status indication can be adjusted. Modbus RTU communication is used to transmit the measured values and can be used to change all of the settings. The Modbus register map provides a complete overview of all adjustable settings.
How is the sensor installed, and what are the power and connectivity requirements?
The sensor is intended for mounting on a wall or flat 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 enclosure fully covers the wall mounting box.
This sensor can be connected with just one RJ45 connector. Power over Modbus (PoM) connects Modbus RTU communication and a 24 VDC power supply via one single UTP-cable. All measured values are available via Modbus RTU communication. A 24 VDC supply voltage increases the safety and reliability of your installation, by offering protection against short circuit, overload and overvoltage.
What are the manufacturing quality and protection ratings?
All sensors are designed and manufactured in Europe. Each device is calibrated and tested in our factory. Only high-quality components are used, ensuring long-term stability and accuracy
The enclosure is produced in-house by Sentera Plastics from premium R-ABS plastic, providing exceptional strength and durability. It is designed for indoor use and offers an IP30 protection against ingress of dust and moisture. With its contemporary modern design, the device seamlessly fits into most interior styles. To ensure optimal performance, the sensor should be protected from direct sunlight.
How to mount and connect the device:
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