ASTM Approves Thermocouple Connector Standard

The new test method allows product to be defined based on performance rather than solely raw material requirements.

Temperature Measurement Standards

W. CONSHOHOCKEN PA, USA ??? Producers that perform verification testing of thermocouples and thermocouple components, along with those who write thermocouple product specifications, will be the primary users of a newly approved standard, ASTM E2820, Test Method for Evaluating Thermal EMF Properties of Base-Metal Thermocouple Connectors.

The new standard is under the jurisdiction of Subcommittee E20.04 on Thermocouples, part of ASTM International Committee E20 on Temperature Measurement.

According to Richard Phillips, senior principal engineer, Goodrich Sensors and Integrated Systems, and an E20 member, the supply chain for thermocouple materials has undergone significant changes in recent years.

???It is becoming increasingly difficult to source material needed to manufacture thermocouple components like connectors,??? says Phillips.???The new test method allows product to be defined based on performance rather than solely raw material requirements. ASTM E2820 will reduce the risk of over-specification.

???Connectors are common to most thermocouple circuits,??? Phillips says. ???ASTM E2820 allows a user to better understand how the connector may affect temperature measurement accuracy.???

The Significance and Use of this new standard says:

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.

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View this release on the ASTM Web site at

ASTM Committee E20 Next Meeting: Nov. 14-15, November Committee Week, Tampa, Fla.

Technical Contact: Richard W. Phillips, Goodrich Sensors and Integrated Systems, Eagan, Minn., Phone: +1 651-681-8876;

ASTM Staff Contact: Christine DeJong, Phone: +1 610-832-9736;