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EU declaration conformity
VOC sensor | Duct | 24 VDC-VAC
Product description
This air quality sensor measures the VOC Index, temperature and relative humidity in ventilation ducts. The VOC Index shows how the level of volatile organic compounds changes over time, helping ventilation systems respond to changes in air quality.
The sensor operates on 24 VDC or 24 VAC and has one analogue output and one relay output. All measured values and device settings are available via Modbus RTU communication.
It is designed for installation in air ducts, with a sensing tube positioned directly in the airflow. The enclosure is made of premium plastic and offers IP54 protection, while the duct probe has IP20 protection.
Additional specifications and description
What are VOCs and Where Should the Sensor Be Installed?
VOCs (Volatile Organic Compounds) are gases released by various products and materials, including paints, cleaning products, solvents and furniture. Elevated VOC levels can negatively affect indoor air quality. The VOC sensor detects changes in VOC levels and provides a VOC Index. It is designed for installation in ventilation air ducts, with the sensing tube positioned directly in the airflow. For reliable measurements and long-term operation, the sensor should be protected from direct sunlight, water and locations with continuously high VOC concentrations.
VOC Index: A Simple Measure of Indoor Air Quality
The VOC Index provides a simple indication of indoor air quality on a scale from 1 to 500, with 100 representing the average VOC level. Values below 100 indicate cleaner-than-average air, while higher values indicate increasing VOC levels and poorer air quality. The index ranges from Excellent to Very Bad and can help demand-controlled ventilation systems automatically adjust airflow to maintain a healthier and more comfortable indoor environment.
How Does the Sensor’s Analogue Output Transmit Values?
The analogue output can be controlled according to the VOC Index or set to a manually selected value. The minimum and maximum VOC levels can be configured to correspond to 0 % and 100 % of the analogue output range. Several analogue output types are supported, allowing the device to be easily integrated with ventilation controllers, HVAC equipment and building management systems.
How Are the Sensor’s Settings and Configuration Adjusted?
The sensor can be configured via Modbus RTU communication. This allows users to adjust VOC thresholds, alarm settings, relay operation and analogue output ranges according to the requirements of the installation. In addition, the device provides status and diagnostic information, helping users monitor its operation and identify potential faults.
What Are the Sensor’s Power Supply and Wiring Requirements?
This VOC sensor operates on 24 VDC or 24 VAC and has three main connections: VIN for the power supply, A and /B for Modbus RTU communication, and GND for ground. A CAT5 or EIB cable is recommended for Modbus RTU communication, with a maximum cable length of up to 1 000 metres.
What Are the Sensor’s Quality, Durability and Protection Features?
The sensing elements are calibrated during production to ensure accurate measurements. A built-in heater helps reduce measurement errors caused by condensation. The sensor is designed for indoor duct installation. Its enclosure provides IP54 protection, while the duct probe has an IP20 protection against ingress of dirt an moisture. Built-in diagnostics help monitor the sensor and detect possible issues. The device also meets EMC, Low Voltage, RoHS and WEEE requirements, making it a reliable solution for ventilation and indoor air quality applications.
Discover How to Easily Install the Sensor
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