PST Relative Humidity Calibration Services

PST have calibration laboratories offering Relative Humidity calibrations in six locations across the globe. Of these, four are ISO17025 accredited:

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Rotronic Switzerland

The high-precision calibration of temperature and humidity measuring devices accordingly places high demands on the reference device.
Our accredited ISO 17025 measurement laboratory (SCS 0065) offers the highest, traceable accuracy for your measurements in the areas of temperature and relative humidity (SCS = Calibration laboratory)
Calibration is possible for both Rotronic products and third-party products!
The measuring ranges and the measurement uncertainties can be found here:

Services include

  • Calibration of relative humidity measuring instruments over the range 0.5 to 99 %rh at 23±2 °C
  • Calibration of relative humidity measuring instruments over the range 10 to 95 %rh, from -10 to +70 °C
  • Calibration of temperature probes in air from -10 to +70 °C
  • Calibration of temperature probes in liquid from -25 to +125 °C

Rotronic UK

The ISO 17025 accredited calibration of humidity and temperature sensors confirms performance and is increasingly a requirement of industry regulations and company quality management systems. The UKAS laboratory at Rotronic UK has steadily evolved over the last few years increasing confidence in the calibrations performed and consequently lowering the Calibration and Measurement Capability (CMC) of the laboratory. Significant improvements have been made in the measurement procedures for dewpoint and temperature in air, which in turn has impacted the Relative Humidity (RH) CMC.

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 °C
  • Temperature calibration of probes in liquid -70 °C to 200 °C
  • UKAS Certification
  • Full Accreditation Scope

Rotronic Germany

The highly accurate calibration of temperature & humidity meters requires the highest requirements for the reference device.
Our accredited ISO 17025 measuring laboratory at Rotronic Germany (SCS 0065) offers the highest traceable accuracy for its measurement in the areas of temperature and relative humidity (SCS = Swiss Calibration Services)
Calibration is possible for Rotronic products as well as for third-party products!
The measuring ranges as well as the measurement uncertainties can be found here:

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Rotronic US

Rotronic’s Calibration laboratory in Hauppauge, New York is Accredited by A2LA to ISO/IEC 17025:2017 and ANSI/NCSL Z540-1-1994 standards for the Calibration of humidity and temperature.
Located in a separate, climate-controlled area, the environment inside of the Calibration laboratory is constantly monitored and maintained. Throughout the Calibration process Rotronic’s proprietary software and algorithms ensure stable and reliable Calibrations.

Services include

  • Calibration of relative humidity measuring instruments over the range 0.1 to 96 %rh at nominally 23 °C
  • Calibration of temperature probes in air from 9 to +46°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