.webp "Duct temperature sensor")
.webp "Duct temperature meter")
.webp "Duct temperature transmitter")
.webp "Duct temperature detector")
.webp "Duct temperature HVAC sensor")
.webp "Duct temperature HVAC transmitter")
EU declaration conformity
Temperature and Humidity Sensor | Duct | 24 VDC
Product description
The DSTHF-3 is a dual sensor designed to measure temperature and relative humidity within air ducts. It can measure temperatures from -30 to 70 °C and relative humidity from 0 to 100% rH (non-condensing), with selectable ranges for both.
The sensor is compatible with a variety of low-voltage power supplies. It features three selectable analog/modulating outputs for temperature, relative humidity, or a combination of both. All parameters are accessible and the firmware can be updated via Modbus RTU communication (RS485). The supply voltage is 24 VDC.
The DSTHF-3 has an IP54 protection rating for its enclosure and an IP20 rating for its probe, making it a reliable 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.
The sensor has three analogue outputs. Each of them transmits one of the measured values and the output value changes in proportion to the measured temperature or relative humidity. Different output types are available, including 0–10 VDC, 0–20 mA, 0–100% PWM, or Modbus RTU. By default, output 1 provides the measured temperature and output 2 relative humidity. The output type is set to 0–10 V, which means that output 1 will transmit 0 V at 0 °C and 10 V at 50 °C. Output 3 is disabled by default, but can transmit temperature or relative humidity.
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.
The supply voltage is 24 VDC. The ground terminals of the power supply (V-) and output (GND) are not connected internally. This means that a 4-wire cable is required to connect this sensor: two wires for the supply voltage and two wires to connect the output(s). A 24 VDC supply voltage increases the safety and reliability of your installation, by offering protection against short circuit, overload and overvoltage. 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 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.
Learn more about optimising your indoor comfort and living conditions:
Remarks, reviews & ratings