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EU declaration conformity
Temperature and Humidity Sensor | Wall mounting | PoM
Product description
The RSTHM-2 series is a versatile room sensor that measures indoor temperature, relative humidity, and ambient light. It features selectable ranges for both temperature (0–50 °C) and humidity (0–100% rH).
The sensor operates on 24 VDC via Modbus and transmits data through three analog outputs (0–10 V default) as well as Modbus RTU. All settings and firmware updates can be managed through the Modbus RTU (RS485) interface.
An integrated ambient light sensor allows for ventilation control based on occupancy, and the intensity of the status indicator LEDs is adjustable.
With its IP30 protection standard, this sensor ensures long-term stability and accuracy.
The RSTHM-2 series is a precise, flexible, and smart solution for indoor environment control, making it ideal for HVAC applications and a wide range of indoor spaces.
Additional specifications and description
Which parameters are measured and why is it important?
This room sensor measures temperature, relative humidity and ambient light. The ambient light sensor can be used in applications to control the ventilation system based on the occupancy of the room. The dew point is calculated based on the temperature and humidity measurements. All measured values are available via Modbus RTU communication.
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. This sensor has no analogue outputs, which makes it simpler and more cost efficient. All measured values can be accessed through the Modbus input registers. They can be read via SenteraWeb — our online HVAC platform — through 3SModbus software, a BMS system, or any other Modbus master device. Modbus offers several advantages. Digital signals are less prone to interference than analogue signals and much longer cables — up to 1000 meters — can be used.
The sensor offers a clear, visual status indication of one of the measured parameters via the green, yellow and red LED light. The green LED indicates that the parameter is within range, yellow signals an alert range, and red indicates extreme values. The light intensity of the LEDs used for status indication can be adjusted. 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 intended for mounting on a wall or flat surface indoors. The mounting holes are designed to accommodate standard European wall mounting boxes. Two screws are required to secure the sensor to the wall mounting box. The enclosure fully covers the wall mounting box.
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. 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. It is designed for indoor use and offers an IP30 protection against ingress of dust and moisture. With its contemporary modern design, the device seamlessly fits into most interior styles. To ensure optimal performance, the sensor should be protected from direct sunlight.
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