Thermoelectric Instability of Some Noble Metal Thermocouples at High Temperatures
- 1 October 1962
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 33 (10) , 1029-1040
- https://doi.org/10.1063/1.1717675
Abstract
Thermoelectric instabilities of noble metal thermocouples and individual thermoelements (platinum, rhodium, iridium, iridium‐50% rhodium, and several platinum‐rhodium alloys) have been studied in the temperature range from 1000 to 1700°C under oxidizing and neutral atmospheres. The principal source of instability was found to be contamination of the thermoelements by impurities from ceramic protection tubes. Several grades of alumina sheathing were tested, and thermocouple errors associated with each grade are reported. Criteria are discussed for the selection and application of noble metal thermocouples to attain maximum thermoelectric stability.Keywords
This publication has 2 references indexed in Scilit:
- The Iron‐Oxygen Equilibrium in Glass: Effect of Platinum on the Fe2+/Fe3+ EquilibriumJournal of the American Ceramic Society, 1961
- Some Observations on the Behaviour of Platinum/Platinum-Rhodium Thermocouples at High TemperaturesJournal of Scientific Instruments, 1949