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Temperature measurements

Platinum-palladium thermocouples

Range: 0 °C to 1500 °C

Ultra-low uncertainty calibration and exceptional drift performance

NPL currently offers UKAS (ISO 17025) calibrations up to 1500 °C employing metal-carbon eutectic fixed points. The calibration uncertainty can be as low as ±0.2 °C over the range 0 °C to 1100 °C, rising to ±0.55 °C at 1330 °C, and ±0.72 °C at 1500 °C.

Our platinum-palladium thermocouples (Pt/Pd) thermocouples, based on extensive research and development, offer ultra-low uncertainties and exceptional drift performance. The types of temperature references used include: 

ITS-90 fixed points

These are the reference temperature artefacts, as specified in the ITS-90, for the practical realisation of the temperature scale. At NPL, the Zn (420 °C), Ag (962 °C) and Cu (1085 °C) fixed points are used for UKAS accredited thermocouple calibrations.  

High temperature fixed-points

These artefacts provide reference temperatures for contact thermometry, above those specified in the ITS-90. They are made from a eutectic alloy of metal and carbon. At NPL, the Co-C (1324 °C) and Pd-C (1492 °C) fixed points are used for UKAS accredited thermocouple calibrations. 

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.

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