.webp "Air quality duct sensor")
.webp "VOC duct sensor")
EU declaration conformity
VOC sensor | Duct | 24 VDC
Product description
TSVCT is a sensor for measuring VOC index, temperature, and relative humidity in air ducts.
The sensor has no analogue outputs and operates on a 24 VDC power supply. All measured values and settings are accessible via Modbus RTU communication.
The enclosure is made of premium plastic and provides an IP20 protection. It is designed for indoor use.
Additional specifications and description
Which parameters are measured and why is it important?
This sensor is designed for monitoring indoor air quality in air ducts. It measures temperature, relative humidity and the VOC index.
The VOC index provides a simplified, dynamic overview of total VOC (TVOC) levels in indoor air and serves as a smart indicator of indoor air quality. It reflects trends in VOC-related air pollution. A reference value of 100 represents the average indoor air composition over the previous 24 hours. Values between 100 and 500 indicate deteriorating air quality, while values between 1 and 100 indicate improving conditions. The index continuously adapts to its environment and helps to detect both deterioration and recovery of indoor air quality over time. When the VOC index shows a downward trend, fan speed can be reduced. In case of an upward trend, more fresh air supply is required to wash away the pollutants.
What are the configuration and customisation options?
This sensor requires little configuration and can be used almost immediately once it has been installed.
The sensor has no analogue outputs. All measured values can be accessed through the Modbus input registers. They can be read via SenteraWeb — our online HVAC platform, via a BMS system, or any other Modbus master device. Modbus communication offers several advantages. Digital signals are less prone to interference than analogue signals and much longer cables — up to 1000 meters — can be used.
How is the sensor installed, and what are the power and connectivity requirements?
The sensor is designed for installation in indoor air ducts. The plastic sensor probe has a length of 85 mm. For optimal performance, place the sensor in a straight section of the duct. Avoid installing near filters, fans, cooling coils, or other sources of turbulent airflow. Make sure the sensor is positioned correctly according to the airflow direction. For more information, please refer to the mounting instructions.
The supply voltage is 24 VDC and the maximum current consumption is 20 mA. Both the supply voltage (V+ and GND) and Modbus RTU communication (A and B/) are connected via a pluggable screw terminal block. This pluggable screw terminal block simplifies installation since the cable can be connected at an easily accessible location and then the connector can be plugged into the sensor. A 4-wire cable (Cat5 or EIB) is required to connect this sensor.
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 ABS. It is designed for indoor use and offers an IP20 protection against ingress of dust and moisture. To ensure optimal performance, the sensor should be protected from direct sunlight. The sensor element is housed within a plastic sensor probe, that includes an opening to allows airflow to come into direct contact with the sensor element.
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