ASTM E1350 - 13

    Standard Guide for Testing Sheathed Thermocouples, Thermocouples Assemblies, and Connecting Wires Prior to, and After Installation or Service

    Active Standard ASTM E1350 | Developed by Subcommittee: E20.04

    Book of Standards Volume: 14.03


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    Significance and Use

    5.1 These test procedures confirm and document that the thermocouple assembly was not damaged prior to or during the installation process and that the extension wires are properly connected.

    5.2 The test procedures should be used when thermocouple assemblies are first installed in their working environment.

    5.3 In the event of subsequent thermocouple failure, these procedures will provide benchmark data to verify failure and may help to identify the cause of failure.

    5.4 The usefulness and purpose of the applicable tests will be found within each category.

    5.5 These tests are not meant to ensure that the thermocouple assembly will measure temperatures accurately. Such assurance is derived from proper thermocouple and instrumentation selection and proper placement in the location at which the temperature is to be measured. For further information, the reader is directed to MNL 12, Manual on the Use of the Thermocouples in Temperature Measurement2 which is an excellent reference document on metal sheathed thermocouple uses.

    1. Scope

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

    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. Some of these tests may not be appropriate for 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 characteristics of installed sheathed thermocouple assemblies and to provide benchmark data for determining if the thermocouple assembly has been subsequently damaged in operation:

    1.3.1 Loop Resistance:

    1.3.1.1 Thermoelements,

    1.3.1.2 Combined extension wires and 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

    E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples

    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

    E2181/E2181M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Noble Metal Thermocouples and Thermocouple Cable

    MNL12 Manual on the Use of Thermocouples in Temperature Measurement


    ICS Code

    ICS Number Code 17.200.20 (Temperature-measuring instruments)

    UNSPSC Code

    UNSPSC Code 41112206(Thermocouples)


    Referencing This Standard

    DOI: 10.1520/E1350

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM E1350-13, Standard Guide for Testing Sheathed Thermocouples, Thermocouples Assemblies, and Connecting Wires Prior to, and After Installation or Service, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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