.webp "Duct temperature transmitter")
.webp "Duct humidity sensor")
.webp "Humidity transmitter for air ducts")
.webp "Temperature sensor for air ducts")
Datasheet
Temperature and Humidity Sensor | Duct | 24 VAC-VDC
Product description
Sensor to measure Temperature and Relative Humidity in air ducts. The dew point is calculated based on both readings.
The sensor has one analogue output and one relay output. It operates on a 24 Volt AC or DC power supply. All measured values and settings are also accessible via Modbus RTU communication.
The enclosure is made of premium plastic and provides an IP54 protection. The duct sensor probe has an IP20 protection rating.
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 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 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. The other default settings are typically suitable for most applications, however, they can also be adjusted, if necessary.
What output types does this sensor offers?
The sensor has one analogue output and one relay output with changeover contact. By default, these are both controlled based on temperature measurement. Control based on relative humidity or via the Modbus master device (override) is also possible. The control of the analogue output can be modified via Modbus Holding register 161. The control of the relay output can be modified via Holding register 191. 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.
The analogue output value changes in proportion to the measured temperature or relative humidity. Different output types are available, including 0–10 Volt, 0–20 mA, 0–100% PWM, 2-10 Volt, 4-20 mA, 0-5 Volt or Modbus RTU. By default, the analogue output type is set to 0–10 Volt, which means that the analogue output will transmit 0 V at 0 °C and 10 V at 50 °C. Also this range is adjustable.
The relay output is activated when the measurement of temperature (or relative humidity) exceeds the activation threshold. The temperature activation threshold can be set in Holding register 19. The relative humidity activation threshold can be set in Holding register 29. As soon as the measurement drops below the threshold (minus hysteresis for stability), the relay output will be disabled.
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. Turbulent airflow can negatively affect the proper functioning of this sensor. Make sure the sensor is positioned correctly according to the airflow direction. This is important for optimising the contact between the sensor element and the airflow. For more information, please refer to the mounting instructions.
The supply voltage is 24 Volt AC or DC. We advise the use of a 24 Volt DC supply voltage which increases the safety and reliability of your installation, by offering protection against short circuit, overload and overvoltage.
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