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EFFECT ON THERMOCOUPLE SIZE AND INSTALLATION ON TEMPERATURE READINGS,
ARMY MISSILE COMMAND REDSTONE ARSENAL ALA STRUCTURES AND MECHANICS LAB
When thermocouples are used in precise testing and experimental work, it is very important that the indication of the thermocouple junction accurately represent the temperature being investigated. When the entire hot junction of a thermocouple is maintained at a steady temperature and there is good physical contact between the thermocouple junction and the surrounding material, its indications are, of course, trustworthy provided no appreciable conduction occurs along the lead wires, and provided radiant interchanges may be neglected. However, if a large temperature gradient exists around the hot junction, or if the temperature of the junction is varying with time, the indication that is read may be questionable. The experiment described in this report was conducted to determine the effect of thermocouple size and installation on temperature reading. It was concluded that for these heat fluxes 30 and 60 BTUsq ft-sec, wire sizes No. 24 and 30 and method of installation bead or separate there was no significant difference in the observed temperature readings. Author