CALIBRATION OF NOBLE METAL THERMO-COUPLES AT THE MELTING POINT OF PALLADIUM

Journal Article · Wed Nov 30 23:00:00 EST 1960 · Izmeritel'naya Tekh.

OSTI ID:4087639

Bragin, B K

The calibration error of platinum-rhodium thermocouples above 1200 deg C can be decreased by an additional determination of the thermal emf of the working junction at the melting point of palladium (1552 deg C plus or minus 2 deg C). A piece of pure palladium wire (99.95% Pd) with a diameter of 0.4 mm and a length of 15 to 20 mm was wrapped around the junction to be calibrated and immersed in a furnace held at a temperature of 10 to l5 deg C above the melting point of palladium by means of a control thermocouple. Constant readings of the thermnal emf were observed on a compensated, low-resistance potentiometer with a subsequent sharp increase in temperature after the fusion of palladium was complete. The agreement with the results obtained with a standard optical pyrometer is good. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-011226
• OSTI ID: 4087639
• Journal Information: Izmeritel'naya Tekh., Journal Name: Izmeritel'naya Tekh. Vol. Vol: No. 12
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

CONTROL SYSTEMS
ENGINEERING AND EQUIPMENT
FURNACES
MELTING
MELTING POINTS
OPTICAL PYROMETERS
OPTICAL SYSTEMS
PALLADIUM
PLATINUM
PYROMETERS
RHODIUM
TEMPERATURE
THERMOCOUPLES
THERMOMETERS
WIRES