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Platinum resistance thermometers are increasingly 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. The collaborative project described in this report was undertaken to measure the frequency dependence in 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.

Additional information

Authors: RUSBY R L, National Physical Laboratory, Teddington (GB);CARTER D F, National Physical Laboratory, Teddington (GB);CROVINI L, Instituto de Metrologie "G. Colonnetti", Torino (IT);MARCARINO P, Instituto de Metrologie "G. Colonnetti", Torino (IT);ACTIS A, Instituto de Metrologie "G. Colonnetti", Torino (IT);DEMATTEIS R, Instituto de Metrologie "G. Colonnetti", Torino (IT);FUHRMANN H G, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);NEUBERT W, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);RAMM C, Physikalisch-Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: EUR 12181 EN (1989) MF, 50 pp., ECU 4, blow-up copy ECU 6.25
Availability: (2)
ISBN: CD-NA-12181-EN-C
Record Number: 198910785 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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