Assessment of tungsten/rhenium thermocouples with metal-carbon eutectic fixed points up to 1500°C

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Proceedings titleTemperature : its measurement and control in science and industry, volume 8: Proceedings of the Ninth International Temperature Symposium
Series titleAIP Conference Proceedings; no. 1552
ConferenceNinth International Temperature Symposium, 19–23 March 2012, Los Angeles, California, USA
Pages587590; # of pages: 4
Subjecttungsten/rhenium thermocouple; Co-C eutectic point; Pd-C eutectic point
AbstractFour Type A thermocouples and two Type C thermocouples were calibrated at the Au fixed point and Co-C and Pd-C eutectic fixed points. The thermocouples were exposed to 1330 °C for a total of 100 hours. The maximum drift due to the exposure was found to be 4.8 °C. The fixed-point calibration EMF of these thermocouples deviated by less than 0.86% from the temperature specified by the standards ASTM E230-2003 for Type C and GOSTR 8.585-2001 for Type A. The length of one of Type A thermocouples A52 is longer than the others by 150mm. Making use of this provision it was possible to place annealed part of A52 to the temperature gradient part of calibration arrangement every time. Therefore observed aging effect was as low as 0.5 °C compared to the other thermocouples.
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AffiliationMeasurement Science and Standards; National Research Council Canada
NoteM. Gotoh was a visiting scientist at the time of publication
Peer reviewedYes
NRC numberNRC-MSS-1569481257
NPARC number21268886
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Record identifier4b9ddded-9514-4432-94ad-a51d6d7d8f40
Record created2013-11-22
Record modified2016-05-09
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