.webp "CO2 sensor audible alarm")
.webp "CO2 transmitter audible visual alarm")
.webp "CO2 fresh air indicator audible visual alarm")
.webp "Carbon dioxide sensor audible alarm")
.webp "CO2 sensor buzzer")
.webp "CO2 sensor buzzer and traffic light")
EU declaration conformity
CO2 sensor | wall mounting | audible alarm, 24 VAC-VDC
Product description
CO2 transmitter with buzzer alert. The supply voltage is 24 VDC or 24 VAC. It measures temperature, relative humidity, CO2 and ambient light. The LED indicators provide a visual indication for one of the measured values. When the CO2 level enters the alert zone, the buzzer is activated to indicate that extra fresh air supply is required. The measured values are transmitted via three analogue outputs and via Modbus RTU communication. The default output type is 0-10 V. Different output types can be selected. The CO2 sensor element is replaceable. In many applications, the ambient light sensor can be used to control the ventilation system in function of the occupancy of the room. All settings can be adjusted via Modbus RTU. Also the light intensity of the LEDs for status indication is adjustable. Typically, this CO2 meter is used in schools, office buildings, restaurants, etc. to measure the carbon dioxide level and to check if sufficient fresh air is supplied into the room.
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. 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. The 0-10 Volt outputs can be used to control an EC fan, a damper actuator or an AC fan speed controller.
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. The 0-10 Volt outputs can be used to control an EC fan, a damper actuator or an AC fan speed controller.
Audible alert and visual indication of the measured value
This CO2 sensor has a built-in buzzer. When the CO2 level enters the alert zone, the buzzer is activated to indicate that extra fresh air supply is required. The LED indicators 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.
Self-calibrating to compensate 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 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
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.
Self-calibrating to compensate 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 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
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.
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.
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