ASTM E2820 - 13

    Standard Test Method for Evaluating Thermal EMF Properties of Base-Metal Thermocouple Connectors

    Active Standard ASTM E2820 | Developed by Subcommittee: E20.04

    Book of Standards Volume: 14.03


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    Significance and Use

    5.1 A thermocouple connector, exposed to a temperature difference, contributes to the output of a thermocouple circuit. The output uncertainty allocated to the connector depends on the connector design and temperature gradient.

    5.2 Connector performance can be classified based on the results of this method and used as part of a component specification.

    5.3 The method can be used as an engineering tool for evaluating different connector designs tested under similar thermal conditions.

    1. Scope

    1.1 This standard describes a thermal emf test method for base-metal thermocouple connectors including Types E, J, K, N and T. Standard connectors such as found in Specifications E1129/E1129M and E1684 as well as non-standard connector configurations and connector components can be evaluated using this method.

    1.2 The measured emf is reported as an equivalent temperature deviation or error relative to a reference thermocouple of the same type. This method can be used to verify deviations introduced by the connector greater than or equal to 1°C.

    1.3 The connector is tested with thermocouple contacts axially aligned with a temperature gradient using a specified thermal boundary condition. The actual temperature difference developed across the connector and corresponding error will depend on the connector design.

    1.4 Connector contacts are often fabricated from raw materials having temperature-emf relationships in accordance with Specification E230. However, verifying Specification E230 tolerances is not within the scope of this method.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.6 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

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

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

    E344 Terminology Relating to Thermometry and Hydrometry

    E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature

    E1129/E1129M Specification for Thermocouple Connectors

    E1684 Specification for Miniature Thermocouple Connectors

    E2488 Guide for the Preparation and Evaluation of Liquid Baths Used for Temperature Calibration by Comparison


    ICS Code

    ICS Number Code 17.200.20 (Temperature-measuring instruments)

    UNSPSC Code

    UNSPSC Code 41112206(Thermocouples)


    DOI: 10.1520/E2820

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