INFLUENCE OF CO-CO$sub 2$ ENVIRONMENTS OF THE CALIBRATION OF CHROMEL-P- ALUMEL THERMOCOUPLES

Technical Report · Thu Mar 28 04:00:00 EST 1963

DOI:https://doi.org/10.2172/4747236· OSTI ID:4747236

McCoy, Jr., H. E.

The thermal output of Chromel-P --Alumel thermocouples decreases as a resuit of exposure to CO--CO/sub 2/ mixtures at elevated temperatures. These calibration changes are significantly greater than those observed for these thermocouple materials in air. In CO/sub 2/-rich mixtures, the negative drift is due primarily to the loss of chromium from solution in the Chromel-P wire as a result of oxidation. In CO-rich mixtures. carburization and oxidation remove chromium from solution, thus causing the thermal electromotive force of the thermocouple to decrease. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-17-016526
• OSTI ID: 4747236
• Report Number(s): ORNL-TM-481
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ALLOYS
ALUMEL
ALUMINUM ALLOYS
CARBIDES
CARBON DIOXIDE
CARBON MONOXIDE
CHEMICAL REACTIONS
CHROMEL
CHROMIUM
CHROMIUM ALLOYS
EFFICIENCY
ELECTRIC POTENTIAL
GASES
HIGH TEMPERATURE
LOSSES
MANGANESE ALLOYS
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL ALLOYS
OXIDATION
SILICIDES
STANDARDS
THERMOCOUPLES