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EU declaration conformity
Temperature and Humidity Controller | Duct | 24 VAC-VDC
Product description
DCTHG-2 is a controller for monitoring and regulating temperature and relative humidity in air ducts. The dew point is calculated based on both readings.
The controller operates on a 24 VAC or 24 VDC power supply and generates one analogue output that can directly control an EC fan, an AC fan speed controller, or a damper actuator. All measured values and settings are accessible via Modbus RTU communication.
The enclosure is made of premium plastic and provides an IP54 protection. The duct probe has an IP20 protection rating.
Additional specifications and description
Which parameters are measured and why is it important?
This controller measures and regulates temperature and relative humidity in air ducts. The dew point is calculated based on these measurements.
Temperature and relative humidity (RH) play a major role in human comfort and the sense of well-being. These parameters are continuously influencing each other. Monitoring and balancing both temperature and relative humidity (and/or dew point) is therefore essential for maintaining stable indoor conditions, preventing condensation, and improving overall comfort and health. Most Sentera sensors and controllers measure both temperature and relative humidity for complete climate control.
What are the configuration and customisation options?
This controller requires little configuration and can be used almost immediately once it has been installed. Temperature and relative humidity can vary depending on the region and season, these parameters are set to the correct values during installation. The other default settings are typically suitable for most applications, however, they can also be adjusted, if necessary. The Modbus register map provides a complete overview of all adjustable settings.
The algorithm controls one analogue output — based on measured values — that can directly control an EC fan, an AC fan speed controller, or a damper actuator. The output value changes in direct proportion to the measured temperature or relative humidity. By default, the output type is 0–10 V, but a different output type can be selected to make it compatible with other devices: 0–20 mA, 0–100%, PWM, or Modbus RTU. Modbus RTU communication is used to transmit the measured values and can be used to change all of the settings.
How is the controller installed, and what are the power and connectivity requirements?
The sensor is designed for installation in rectangular or circular air ducts. The black mounting flange simplifies installation onto circular ducts. 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 VAC or 24 VDC. The ground terminals of the power supply (V-) and output (GND) are internally connected. This means that a 3-wire cable is required to connect this sensor. Make sure not to connect this common ground to other devices that are powered by a DC voltage.
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.
What are the manufacturing quality and protection ratings?
All controllers 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 ASA, providing exceptional strength and durability. The enclosure offers an IP54 protection against ingress of dust and moisture. The sensor element is housed within the duct probe, which has an IP20 protection rating. The probe includes an opening that allows airflow to come into direct contact with the sensor element.
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