Calibration of industrial-type platinum resistance thermometers
Industrial platinum resistance thermometers (IPRTs), when properly realised and selected, afford temperature measurements to within +/- 0.1 C up to 630 C. However, they must be calibrated individually using an adequate calibration procedure. To recommend such a procedure, more than 30 IPRT elements were obtained from European manufacturers, assembled with suitable leads and stems, and submitted to selection tests. Two groups of 6 IPRTs were formed for calibration, one group in the temperature range 0 to 630 C and the other in the temperature range 0 to 850 C. Excessive instability and hysteresis were found with the calibrations above 630 C. They also affect the accuracy of the interpolation at lower temperatures. Two types of interpolation procedure are recommended for the temperature range 0 to 630 C. With the interpolation procedure affording the best precision, a global uncertainty of +/- 22 mK (2 s.d) is achieved in the measurement of temperatures.
Bibliographic Reference: EUR 13912 EN (1992) 86 pp., FS, ECU 8.75
ISBN: ISBN 92-826-3438-8
Record Number: 199210038 / Last updated on: 1994-12-02
Original language: en
Available languages: en