Rotronic humidity and temperature measuring solutions

Rotronic humidity and temperature measuring solutions

Rotronic Logo 150x56

Products & Services | Rotronic AG

Rotronic is one of the world’s longest-established and most respected providers of measurement and monitoring solutions for environmental humidity and temperature.

Measurement of environmental temperatures and air humidity plays key roles in ensuring ideal conditions in pharmaceutical production facilities, clean rooms and storage areas and across the whole value chain from manufacturing to pharmacy distribution and retail.

Relative and specific humidity measurement and monitoring is often the key concern, particularly in heating, ventilation and air-conditioning (HVAC) systems, drying processes and storage. However, temperature is also a key variable, particularly with temperature-sensitive biotech products. Therefore Rotronic measuring and monitoring instruments usually also provide combined temperature and humidity measurement capabilities.

Relative humidity vs. specific humidity

Humidity is affected by both air density and ambient temperature, which means it can be measured in different ways.

  • Relative humidity is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at the same temperature. Thus relative humidity depends on temperature and the pressure within the system of interest.
  • Specific humidity, sometimes referred to as the humidity ratio, is the ratio between water vapor mass (mv) to the total volume (parcel) of air enclosed. Specific humidity is approximately equal to the “mixing ratio”, which is defined as the ratio of the mass of water vapor in an air parcel to the mass of dry air for the same parcel.
  • Absolute humidity is the total mass of water vapor present in a given volume of air. It does not take temperature into consideration. Absolute humidity in the atmosphere ranges from near zero to roughly 30 grams per cubic meter when the air is saturated at 30 °C.

Measurement of humidity must often take account of a further variable, the dew temperature or dew point: the temperature at water vapor reaches saturation and condenses into liquid dew.

Rotronic offers a free online calculator for dew point, specific humidity and relative humidity.

Rotronic Humidity And Temperature Measurement Solutions

Rotronic provides a wide range of temperature and humidity measurement instruments and systems. These can act as stand-alone solutions or can be integrated into RMS, the Rotronic Continuous Monitoring System.

RMS provides one complete, flexible and yet simple environmental monitoring solution instead of many fragmented and complex systems working in isolation.

This is an end-to-end solution for which Rotronic offers a wide range of components to meet all needs with very wide choice of sensors, probes and input devices. It is also compatible across a broad range of third-party devices and systems.

RMS is based on server-based web software with a secure SQL database that can store all recorded measurements securely in a system that the user can access at any time, generating a range of alerts or warnings as well as automated reports.

The system has already been extensively tested successfully and proven its worth in large-scale projects from global pharmaceuticals to local manufacturing companies. Customer feedback has enabled the system to continue to evolve, further enhancing many key features.

Rotronic humidity and temperature measurement components also include ranges of data loggers, measuring probes, wall-mounted monitors and handheld instruments:

Data loggers

BL-1D – A range of compact, dependable and inexpensive Data Loggers for barometric pressure, humidity temperature and dew point, equipped with FDA 21 CFR Part 11 / GAMP 5-compliant HW4 software.

HygroLog HL20 – A compact data logger that displays humidity and temperature measurement offering high precision and reliability with affordability. The HL-20 series is easy to use and deployable in a wide range of applications. Thanks to its integrated batteries, the HL-20 works completely independently and offers its users maximum flexibility.

HygroLog HL-1D – A compact, dependable and inexpensive data logger ideal for extensive networked installations.


HC2A-S Probe: The HC2-S or HC2-S3 are the most versatile probes from Rotronic and form the basic building blocks of the overall temperature and humidity measuring range. They measure humidity and temperature and calculate dew or frost point. They are equipped with UART Digital interface and scalable analog outputs.

HC2A-S3 Standard meteo probe – a variation of the HC2A designed for meteorological measurements and designed for exterior mounting.

Wall-mounted transmitters/monitors

HygroFlex3 – HF3 : measures relative humidity and temperature and calculates the dew/frost point. Available n R-Type or S-Type variants for interior use where elegant aesthetics are also a consideration or in W-Type / D-Type variants for HVAC applications focused on reliability and repeatability.

HygroFlex5 – HF5: The HygroFlex5-series is the latest development in transmitters for humidity, temperature and dew point. One outstanding feature of this innovative product is the capability to output any psychrometric calculation as an analogue signal.

HygroFlex5 – EX – The new HygroFlex5-EX series incorporate all the advanced features of the HF5 for the exact measurement of humidity and temperature but is designed for use in explosive atmospheres. This device conforms to the latest ATEX international standards.

HygroFlex8 – HF8: A multi-function wall-mounted transmitter that displays relative humidity, temperature and all calculated (psychrometric) parameters that is designed to meet the requirements of HVAC, industrial and pharma applications requiring multiple measurements within one self contained instrument. The HF8 has an extensive set of optional functions and settings that can be configured and enabled with HW4 software after connecting to a PC.

Handheld instruments and portable calibrators

HygroPalm HP32: The HygroPalm HP32 is a versatile handheld instrument compatible with all HC2A and HC2 ROTRONIC probes, it is able to perform spot measurements and logging of relative humidity, temperature and psychrometric parameters.

HygroGen2 HG2-S Humidity Generator – Portable humidity and temperature generator to calibrate humidity and temperature measuring instruments for multi-point calibration

HygroGen2 HG2-XL: Humidity Calibrator – A high capacity humidity and temperature calibration tool that can simultaneously calibrate multiple humidity and temperature measuring instruments across a site.


Click on Rotronic humidity and temperature measurement for other information.
Click on Rotronic to contact the company directly.
Click on Products for more information on Rotronic measurement solutions.

RMS environmental monitoring embraces a wide choice of modules and input devices

RMS environmental monitoring embraces a wide choice of modules and input devices

Hygroflex5 – HF5 – HVAC transmitter

Hygroflex5 – HF5 – HVAC transmitter

Hygrogen2 - HG2-S - Humidity Generator

Hygrogen2 – HG2-S – Humidity Generator

Hygropalm - HP32– Versatile Handheld Instrument

Hygropalm – HP32– Versatile Handheld Instrument

Supplier Information
Supplier: Rotronic AG
Address: Grindelstrasse 6, CH-8303 Bassersdorf, Switzerland
Tel: +41 44 838 1144
Fax: +41 44 838 1487

Comments are closed.