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.webp "Duct relative humidity detector")
.webp "Duct relative humidity HVAC sensor")
.webp "Duct relative humidity HVAC transmitter")
EU declaration conformity
Temperature and Humidity Sensor | Duct | PoM
Product description
The DSTHM-2 is a combined sensor designed for accurate measurement of temperature and relative humidity within air ducts. It measures temperature from -30 to 70 °C and relative humidity from 0 to 100% rH (non-condensing), and can also calculate the dew point. Both temperature and humidity ranges are selectable.
The sensor operates with Power over Modbus (PoM), with all parameters and measurements accessible via Modbus RTU (RS485). The bootloader feature allows for convenient firmware updates through Modbus RTU communication.
The DSTHM-2 has an IP54 protection rating for its enclosure and an IP20 rating for its probe, making it a reliable and easily integrable solution for in-duct temperature and humidity control applications.
Additional specifications and description
Which parameters are measured and why is it important?
This sensor measures temperature and relative humidity in air ducts. The dew point is calculated based on this 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 measure temperature and relative humidity for complete climate control.
What are the configuration and customisation options?
This sensor 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, while the other default settings are typically suitable for most applications.
This sensor has no analogue outputs, which makes it simpler and more cost efficient.
Modbus RTU communication is used to transmit the measured values and can be used to change all of the settings. The Modbus register map provides a complete overview of all adjustable settings.
How is the sensor 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.
This sensor can be connected with just one RJ45 connector. Power over Modbus (PoM) connects Modbus RTU communication and a 24 VDC power supply via one single UTP-cable. All measured values are available via Modbus RTU communication. To make wiring easier, we recommend using a Sentera 24 VDC power supply with an RJ45 connector. A 24 VDC supply voltage increases the safety and reliability of your installation, by offering protection against short circuit, overload and overvoltage.
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 R-ABS plastic, 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 sensor 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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