ASTM-E452 2013

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E452-02(2013) Standard Test Method for Calibration of Refractory Metal Thermocouples Using a Radiation Thermometer

Published By	Publication Date	Number of Pages
ASTM	2013	14

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Categories: 17.200.20 - Temperature-measuring instruments, ASTM

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Description

ASTM E452-02-Reapproved2013

Historical Standard: Standard Test Method for Calibration of Refractory Metal Thermocouples Using a Radiation Thermometer

ASTM E452

Scope

1.1 This test method covers the calibration of refractory metal thermocouples using a radiation thermometer as the standard instrument. This test method is intended for use with types of thermocouples that cannot be exposed to an oxidizing atmosphere. These procedures are appropriate for thermocouple calibrations at temperatures above 800 °C (1472 °F).

1.2 The calibration method is applicable to the following thermocouple assemblies:

1.2.1 Type 1—Bare-wire thermocouple assemblies in which vacuum or an inert or reducing gas is the only electrical insulating medium between the thermoelements.

1.2.2 Type 2—Assemblies in which loose fitting ceramic insulating pieces, such as single-bore or double-bore tubes, are placed over the thermoelements.

1.2.3 Type 2A—Assemblies in which loose fitting ceramic insulating pieces, such as single-bore or double-bore tubes, are placed over the thermoelements, permanently enclosed and sealed in a loose fitting metal or ceramic tube.

1.2.4 Type 3—Swaged assemblies in which a refractory insulating powder is compressed around the thermoelements and encased in a thin-walled tube or sheath made of a high melting point metal or alloy.

1.2.5 Type 4—Thermocouple assemblies in which one thermoelement is in the shape of a closed-end protection tube and the other thermoelement is a solid wire or rod that is coaxially supported inside the closed-end tube. The space between the two thermoelements can be filled with an inert or reducing gas, or with ceramic insulating materials, or kept under vacuum.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

high-temperature calibration; optical pyrometer; radiation thermometer; refractory metal thermocouple; thermocouple; thermocouple calibration; vacuum furnace

ICS Code

ICS Number Code 17.200.20 (Temperature-measuring instruments)

DOI: 10.1520/E0452-02R13

Additional information

Standard Title	E452-02(2013) Standard Test Method for Calibration of Refractory Metal Thermocouples Using a Radiation Thermometer
Published Code	ASTM
Publication Date	2013
Pages Count	14
ICS Codes	17.200.20 - Temperature-measuring instruments