1. Scope

1.1 This guide covers methods for users to test metal sheathed thermocouple assemblies, including the extension wires, just prior to, during, and after installation.

1.2 The tests are intended to ensure that the thermocouple assemblies have not been damaged during storage or installation, to ensure that the extension wires have been attached to connectors and terminals with the correct polarity, and to provide benchmark data for later reference when testing to assess possible damage of the thermocouple assembly after operation. They are not, generally, applicable to thermocouples that have been exposed to temperatures higher than the recommended limits for the particular type.

1.3 The tests described herein include methods to measure the following variables of installed sheathed thermocouple assemblies and to provide benchmark data for determining if the thermocouple assembly is subsequently damaged in operation:

1.3.1 Loop Resistance:

1.3.1.1 Thermoelements,

1.3.1.2 Combined extension wires and the thermoelements,

1.3.2 Insulation Resistance:

1.3.2.1 Insulation, thermocouple assembly,

1.3.2.2 Insulation, thermocouple assembly and extension wires.

1.3.3 Seebeck Voltage:

1.3.3.1 Thermoelements,

1.3.3.2 Combined extension wires and thermocouple assembly.

1.4 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

E230 Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples

E344 Terminology Relating to Thermometry and Hydrometry

E780 Test Method for Measuring the Insulation Resistance of Mineral-Insulated, Metal-Sheathed Thermocouples and Thermocouple Cable at Room Temperature

E839 Test Methods for Sheathed Thermocouples and Sheathed Thermocouple Cable

E1129/E1129M Specification for Thermocouple Connectors

E1684 Specification for Miniature Thermocouple Connectors

Keywords

sheathed thermocouples; thermocouple installations; thermocouple testings; thermocouples ;

ICS Code

ICS Number Code 17.200.20 (Temperature-measuring instruments)

DOI: 10.1520/E1350-97R01

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