Menu
Close
Sign up for NPL updates
Close
Sign up for NPL updates

For people, place, prosperity and planet, we deliver impact with measurement science.

Temperature measurements

Standard platinum resistance thermometers

Range: -196 °C to 962 °C

High accuracy calibrations  

Standard platinum resistance thermometers (PRTs) are very high accuracy instruments which are sensitive to electrical noise and their thermal treatment is crucial. They are the instruments specified in the International Temperature Scale of 1990 (the ITS-90) for performing measurements within the range -259.3467 °C (the triple point of hydrogen) to 961.78 °C (the freezing point of silver).

SPRTs of the long-stem construction can be calibrated over various temperature ranges, depending on the application and required accuracy, by measurement at the appropriate ITS-90 fixed points between -196 °C to +962 °C. All the calibration services are fully UKAS (ISO 17025) accredited. The uncertainties achievable are as low as ±0.0017 °C at -196 °C, ±0.00016 °C at 0.01 °C and ±0.004 °C at 962 °C.

Thermometers that are not suitable for measurement in the ITS-90 fixed point apparatus, for example on account of length or immersion requirements, may be calibrated by comparison with standard thermometers in appropriate baths.

Don’t see what you are looking for? Our diverse skill set enables us to provide bespoke solutions. Please contact us to discuss your requirements.

Contact us

Are you interested in bridges

Contact us

Our research and measurement solutions support innovation and product development. We work with companies to deliver business advantage and commercial success.
Contact our Customer Services team on +44 20 8943 7070