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.webp "Duct CO2 transmitter")
.webp "Duct CO2 detector")
.webp "Duct CO2 HVAC sensor")
.webp "Duct CO2 HVAC transmitter")
EU declaration conformity
Duct CO2 sensor | 24 V DC
Product description
This CO2 transmitter measures temperature, relative humidity, and CO2 (carbon dioxide) in air ducts.
The supply voltage is 24 V DC. The measured values are communicated via three analogue outputs and Modbus RTU. The output type is 0-10 V by default, but another format can be chosen. The CO2 sensor element is replaceable and self-calibrating.
Modbus RTU can be used to change all of the settings.
Additional specifications and description
Optimised for air ducts
When people breathe, they emit CO2 or carbon dioxide. As a result, CO2 concentration is a good indicator of a space's occupancy and activity level. CO2 sensors are used as an indicator for ventilation requirements in many applications. In air ducts, this HVAC transmitter measures temperature, relative humidity, and CO2. The dew point is calculated using temperature and humidity. This sensor works best when installed in a straight section of the air duct. Avoid installing near filters, fans, cooling coils, and other sources of turbulent air. Place the sensor correctly in relation to the airflow direction. For more information, please refer to the mounting instructions.
When people breathe, they emit CO2 or carbon dioxide. As a result, CO2 concentration is a good indicator of a space's occupancy and activity level. CO2 sensors are used as an indicator for ventilation requirements in many applications. In air ducts, this HVAC transmitter measures temperature, relative humidity, and CO2. The dew point is calculated using temperature and humidity. This sensor works best when installed in a straight section of the air duct. Avoid installing near filters, fans, cooling coils, and other sources of turbulent air. Place the sensor correctly in relation to the airflow direction. For more information, please refer to the mounting instructions.
NDIR sensor technology
The CO2 level is measured using NDIR, or Non-dispersive Infrared technology. This technology has a low life-cycle cost and long-term precision and stability. There are three analogue outputs on this sensor. Each one sends one of the measured values. For example, output 1 will transmit 0 V at 0 °C and 10 V at 50 °C by default. Each output value varies proportionally with temperature, humidity, or CO2 concentration. Output 1 provides the measured temperature, output 2 provides relative humidity, and output 3 provides CO2 concentration.
Easy to use
This sensor requires very little configuration. It is almost directly usable once it has been installed. Temperature and relative humidity are often region- and seasonal-specific. These parameters are still adjusted to the correct values during installation. The other default settings will be suitable for most applications. However, they can also be adjusted via the respective Modbus registers if necessary. A different output type, for example, can be selected to make it compatible with other devices: 0-10 VDC; 0-20 mA; 0-100% PWM; Modbus RTU.
4-wire connection
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. 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
The ABC logic self-calibrating algorithm is enabled by default. This algorithm is intended for use in applications where CO2 concentrations will fall to outside ambient conditions (400 ppm) at least once (15 minutes) in a 7-day period, as is common during unoccupied periods. The sensor will reach operational accuracy after 25 hours of continuous operation when exposed to 400 ppm 10 ppm CO2 ambient reference levels of air.
Air ducts
The enclosure has been designed specifically for CO2 measurements in air ducts. It has an IP54 rating for dust and moisture protection. The sensor element is built into the duct sensor probe. This probe has an opening through which the air flow can make direct contact with the sensor element. The sensor probe itself has an IP20 rating.
The CO2 level is measured using NDIR, or Non-dispersive Infrared technology. This technology has a low life-cycle cost and long-term precision and stability. There are three analogue outputs on this sensor. Each one sends one of the measured values. For example, output 1 will transmit 0 V at 0 °C and 10 V at 50 °C by default. Each output value varies proportionally with temperature, humidity, or CO2 concentration. Output 1 provides the measured temperature, output 2 provides relative humidity, and output 3 provides CO2 concentration.
Easy to use
This sensor requires very little configuration. It is almost directly usable once it has been installed. Temperature and relative humidity are often region- and seasonal-specific. These parameters are still adjusted to the correct values during installation. The other default settings will be suitable for most applications. However, they can also be adjusted via the respective Modbus registers if necessary. A different output type, for example, can be selected to make it compatible with other devices: 0-10 VDC; 0-20 mA; 0-100% PWM; Modbus RTU.
4-wire connection
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. 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
The ABC logic self-calibrating algorithm is enabled by default. This algorithm is intended for use in applications where CO2 concentrations will fall to outside ambient conditions (400 ppm) at least once (15 minutes) in a 7-day period, as is common during unoccupied periods. The sensor will reach operational accuracy after 25 hours of continuous operation when exposed to 400 ppm 10 ppm CO2 ambient reference levels of air.
Air ducts
The enclosure has been designed specifically for CO2 measurements in air ducts. It has an IP54 rating for dust and moisture protection. The sensor element is built into the duct sensor probe. This probe has an opening through which the air flow can make direct contact with the sensor element. The sensor probe itself has an IP20 rating.
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