Transmitters for Humidity Measurement

Our humidity and temperature measurement transmitters with either an interchangeable probe input, or a fixed / integrated probe provide high precision measurements with analogue or digital outputs for process monitoring and control.

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FAQ's

  • There are 2 main types of Rotronic transmitters. One with a fixed sensor and one with a replaceable sensor. These transmitters usually come as 2 and 3/4-wire and sometimes also as digital version (with RS-485). Depending on the requirements in terms of accuracy and measuring environment, there are different transmitters that can be used.

  • The primary function of a transmitter is to transmit data. In the case of measurement transmitters, the device captures data using a probe or sensor, converts this data into an interpretable signal, and then transmits this signal. This allows for centralized monitoring, data logging and controlling other devices based on the transmitted information. Modern instruments can transmit data via wires (wired transmitters) or using radiofrequencies (wireless). In this blog we are only discussing wired transmitters.

  • There are multiple factors, which need to be taken into account when selecting a transmitter like: What is the primary application? (e.g., HVAC, industrial control, high-temperature environments) What is the budget for initial investment vs. long-term maintenance? Is flexibility in probe performance a priority? How critical is accuracy for the application? What is the expected frequency of calibration and the associated costs? Can the application tolerate maintenance / calibration downtime?

  • The electrical signal generated by a capacitive sensor is usually very small and must be amplified and conditioned for accurate measurement. Transmitters typically use analog 4-20mA signals because they are resistant to interference. Some prefer digital signals, such as Modbus, which is suitable for connecting multiple devices on the same network.

  • When installing and using transmitters, it is important to ensure electrical safety and that the transmitter is installed in accordance with the manufacturer's instructions. Environmental safety aspects should be considered to protect the sensor and transmitter from damage caused by moisture, dust and other contaminants. Safe installation is also required to avoid potential hazards from physical impact.

  • There are many ways to connect a transmitter to an automation system. Most often this is done with the help of a PLC, usually with a 4-20mA signal or digitally via Modbus.

  • In order to protect the sensor and transmitter from performance degradation caused by moisture, dust and other contaminants, safety aspects should be considered. Safe installation is also required to avoid potential hazards from physical impact.


Some applications include cleanrooms, controlled environments, data centers, building management systems, storage areas, swimming pools, museums and galleries and numerous other industrial applications.

Our humidity and temperature measurement transmitters with either an interchangeable probe input, or a fixed / integrated probe provide high precision measurements with analogue or digital outputs for process monitoring and control, cleanrooms, controlled environments, data centers, building management systems, storage areas, swimming pools, museums and galleries and numerous other industrial applications.

Humidity transmitters are available in wall, duct, and compact space mount versions; they can be configured exactly as required either pre-delivery or on-site using software. Many devices provide a moisture value such as dew point or Mixing Ratio (g/kg).

Our transmitters with an interchangeable probe input enable a suitable probe to be selected for any application from the wide range available including Ø4 mm, screw-in, stainless steel, insertion, and long industrial types. They can be swopped out in seconds when calibration or service work are due without any calibration adjustment being required.

Transmitters can easily be integrated into our continuous environmental monitoring system with all data available anywhere. This is the Rotronic Monitoring System.

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Contact our experienced engineers to discuss your application needs.