White enclosure with airflow openings and Visual alert

Plastic enclosure with black base and white cover with airflow openings

PCB with components mounted in a black enclosure

Temperature | humidity controller wall mounting | PoM

(Average rating 3.67 of total 3 reviews)

Article code RCTHM-2

GTIN 14 5401003017951

Intrastat number 90.32.89.00

Category Room temperature and humidity controllers

Current stock 4 U.

Factory lead time 5 Week(s)

Product description

The RCTHM-2 is a smart room sensor designed for optimizing indoor climate control. It measures both temperature (0–50 °C) and relative humidity (0–95% rH). The sensor generates an output value based on these measurements, allowing for direct control of an EC fan, AC fan speed controller, or a damper with an actuator.

It offers adjustable temperature and humidity ranges and includes an ambient light sensor with adjustable "active" and "standby" levels. The device is powered by 24 VDC via Power over Modbus (PoM) with an RJ45 connector.

All parameters are accessible via Modbus RTU, and the sensor's bootloader feature allows for firmware updates through this communication protocol. The sensor also features three LEDs with adjustable light intensity for status indication and has an IP30 protection standard, making it a smart and integrated solution for a variety of indoor climate control applications.

Documents

EU declaration conformity

Datasheet

Modbus register map

Mounting instruction

Additional specifications and description

How Do the LEDs and Outputs on the Sensor Work?

The green, yellow, and red LEDs on this HVAC sensor controller provide a distinct, visual indication of the temperature. The green LED shows that the temperature is within acceptable limits. The yellow LED turns on when the temperature reaches the alert range. Red indicates extreme temperatures. The LEDs can also be used to visualise relative humidity. Modbus RTU provides access to the measured temperature, relative humidity, and ambient light level. This sensor's output can operate a damper actuator, an AC fan speed controller, or an EC fan. In proportion to the measured temperature and relative humidity, the output value changes. For instance, the sensor will increase the fan speed or open the damper if the relative humidity rises.

How Is the Sensor Connected, and What Is PoM Technology?
It only takes one RJ45 connector to connect this sensor. Power over Modbus (PoM) refers to the connection of Modbus RTU communication and a 24 V DC power supply via one single cable. We recommend using a Sentera 24 V DC power supply with RJ45 connector to make wiring easier. These power supplies have short-circuit, overload, and overvoltage protection. A supply voltage of 24 V DC improves the safety and dependability of your installation.

What Are the Sensor's Installation and Customization Options?

This sensor requires very little configuration. Once installed, it is almost directly ready to use. Temperature and relative humidity are frequently region- and season-dependent. These parameters are still set to the correct values during installation. The other default settings are likely to be adequate for most applications. They can, however, be adjusted using the respective Modbus registers if necessary. The light intensity of the LEDs for status indication for instance is adjustable. The Modbus register map provides a complete overview of all adjustable settings.

What Are the Sensor's Manufacturing Quality, Calibration, and Protection Features?

This HVAC sensor controller is manufactured in Europe. Each sensor is calibrated and tested in our factory. We use sensor elements and components of high quality. This ensures the long-term stability and accuracy of this HVAC transmitter. The enclosure offers an IP30 protection against ingress of dust and moisture. It can be mounted on a wall indoors. To ensure optimal performance, it should be protected from direct sunlight.