Rotronic Instruments Calibration Services for Humidity and Temperature

The calibration laboratory of Rotronic Instruments UK Limited is UKAS accredited for the measurement of humidity, temperature and dew point. We are proud to advise that our measurement uncertainties are the lowest of possibly any commercial laboratory in northern Europe. Rotronic humidity sensors can be adjusted if found to be necessary to meet customer defined tolerances. Our calibration service offers competitive pricing and a typical turnaround time of 72 hours for a three-point relative humidity calibration. Please contact us for further details.

Services include

  • Calibration of relative humidity measuring instruments using unsaturated salt solutions at 5 %rh, 10 %rh, 11 %rh, 20 %rh, 35 %rh, 50 %rh, 60 %rh, 65 %rh, 75 %rh, 80 %rh & 95 %rh over a range 23 °C ±2 °C
  • Calibration of dew point measuring instruments over the range -60 °C dew point to +95 °C dew point
  • Calibration of relative humidity measuring instruments by comparison with a chilled mirror hygrometer and platinum resistance thermometers in the range 0 °C to 95 °C; 2 %rh to 98 %rh
  • Temperature calibration of probes in air -60 °C to 150 °CM
  • Temperature calibration of probes in liquid -70 °C to 200 °C

Which Calibration Do I Need?
Factory Adjustment Certificate (ISO) OR SCS/UKAS Certificate?

SCS, UKAS, NIST-Certificate Calibrations

Your internal quality process requirements generally determine whether a factory adjustment certificate suffices or whether an ISO 17025 (SCS/UKAS) certificate is needed. SCS or UKAS certificates are generally required in the pharmaceutical industry, the medical technology industry, research and development and the food industry. ISO 17025 certifications are performed with high precision reference hygrometers and for temperature calibration, an equally high precision temperature bath is used. The best possible SCS or UKAS calibration accuracy can only be achieved if all process parameters are controlled and checked at the highest level – SCS certification is therefore only possible in our accredited laboratory (SCS-0065).

Factory Calibrations as per ISO 9001 Standard

A standard traceable adjustment certification can be carried out by you or by our calibration technicians. The following calibration methods are suitable for this:

  • HygroGen2 (humidity and temperature generator – Standard and XL models from 0…60 °C and 5…95 %RH as standard; option of -5…60 °C and 2…99 %RH)
  • ROTRONIC humidity standards (calibration solutions from 0.5…95 %RH in packs of five ampoules and textile pads with SCS certificate)
  • Traceable ISO9001 calibration from -100 to +90°C (-148 to +194°F) dew point


Rotronic Instruments understands and endorses the need to conform to recognized standards for quality and calibration. Our calibration laboratory maintains full traceability to Swiss, (SCS), British (NPL) and American (NIST) Humidity Standards. Our scope may be viewed on the UKAS website