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Platinum resistance thermometers are often used in industry because they can offer greater accuracy and stability than thermocouples, at least up to 630 C. Industrial process control instrumentation is dc-based and likely to remain so. On the other hand calibration is increasingly carried out using ac. It is therefore necessary to ensure that ac and dc measurement techniques are consistent. This collaborative project measured the frequency dependence of a wide variety of currently available thermometers over the range -200 C to 630 C, using several different measurement systems. Results from the three participating laboratories have been brought together, in the expectation that conclusions drawn from them will have general validity.

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Authors: FUHRMANN H G, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);NEUBERT W, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);RAMM G, Physikalisch-Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: EUR 12243 EN (1990) 47 pp., MF, ECU 4
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