ASTM-E2820 Standard Test Method for Evaluating Thermal EMF Properties of Base-Metal Thermocouple Connectors

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



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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.

Significance and Use

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.

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

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


connector emf; thermocouple connector; thermocouple contact; thermocouple pin; thermocouple socket; thermocouple terminal; ICS Number Code 17.200.20 (Temperature-measuring instruments)

To find similar documents by ASTM Volume:

14.03 (Temperature Measurement)

To find similar documents by classification:

17.200.20 (Temperature-measuring instruments Including thermostats Medical thermometers, see 11.040.55)

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Document Number


Revision Level

2013 R24 EDITION



Modification Type


Publication Date

May 30, 2024

Document Type

Test Method

Page Count

6 pages

Committee Number