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Thermocouples stable in heat.

Ultra-stable platinum/palladium (Pt/Pd) thermocouples and UKAS-accredited high temperature calibration services developed at NPL, the National Physical Laboratory, are being made available through temperature instrumentation and calibration company Isothermal Technology

Temperature measurements above 1000[degrees]C can be subject to large uncertainties and can be difficult to verify Using pure metals rather than alloys, Pt/Pd thermocouples can up to around 1500[degrees]C, with very low drift and de-calibration.

NPL's thermocouples have a novel mechanism that reduces the mechanical stresses caused by the differential expansion of the platinum and palladium wires with increasing temperature. This makes the NPL model robust compared with conventional platinum/platinum rhodium thermocouples.

The thermocouples are supplied with an NPL calibration with an uncertainty of +/-0.2[degrees]C, from 0[degrees]C to 1100 [degrees]C, rising linearly to +/-0.55 [degrees]C at 1330[degrees]C (using the Co-C fixed point at 1324[degrees]C) or +/-0.7 [degrees]C at .15.0.0[degrees]C.(using the Pd,C. fixed point at 1492[degrees]C).

Isotech will also market NPL's thermocouple calibration service, including calibration of platinum-rhodium thermocouples, which use metal-carbon eutectic fixed point cells and are the first in the world to be ISO 17025 accredited.

These services ensure better temperature measurement in industry, reduced energy use and benefits to efficiency and the environment.

* See also page 44

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Title Annotation:Technology; National Physical Laboratory and Isothermal Technology
Publication:Environmental Engineering
Article Type:Brief article
Date:Dec 1, 2012
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