ASTM E839-23 PDF

Full title and description

ASTM E839-23 — Standard Test Methods for Sheathed Thermocouples and Sheathed Thermocouple Cable. This document collects and describes standardized test methods used to characterize mineral‑insulated, metal‑sheathed (MIMS) thermocouple assemblies and sheathed thermocouple cable for purposes of quality control, specification, and verification.

Abstract

ASTM E839-23 is a test-method compendium that lists and describes measurement and inspection procedures for the materials and assemblies used in sheathed thermocouples and sheathed thermocouple cable. It groups tests for insulation, sheath, thermoelement, and assembly properties (for example: compaction, thickness, resistance, sheath integrity, dimensional and metallurgical checks, electrical continuity, thermal response time, radiography, and thermal cycling). The standard does not itself set acceptance criteria but provides the methods referenced by other ASTM specifications that do.

General information

• Status: Active / Current (published)
• Publication date: 1 November 2023 (effective date)
• Publisher: ASTM International
• ICS / categories: 17.200.20 — Temperature‑measuring instruments
• Edition / version: E839-23 (current edition; replaces E839-11(2016)e1)
• Number of pages: 18

Scope

This standard lists methods for testing mineral‑insulated, metal‑sheathed (MIMS) thermocouple assemblies and sheathed thermocouple cable. It is intended to support quality control and to evaluate suitability for specific applications. The document describes methods but does not mandate that any particular test be performed nor does it specify acceptance criteria — those criteria are provided in the individual ASTM specifications that require the tests. The tests span insulation, sheath, thermoelement, and complete‑assembly examinations and measurements.

Key topics and requirements

• Insulation tests: compaction (direct, absorption, tension), insulation thickness, electrical resistance at room and elevated temperatures.
• Sheath tests: integrity (water tests, leak/mass‑spectrometer methods), length/diameter/roundness, wall thickness, surface inspection (visual, dye‑penetrant), metallurgical structure, and ductility (bend and tension).
• Thermoelement tests: calibration procedures, homogeneity checks, drift assessment, diameter/roundness/spacing, ductility, and metallurgical examination.
• Assembly tests: dimensions (length, diameter, roundness), surface and moisture‑seal inspection, electrical continuity and loop resistance, connector polarity checks, radiographic inspection, thermal response time, and thermal‑cycle testing.
• Guidance on units and tolerances: SI and inch‑pound values are provided separately and must be used independently.
• Notes on applicability: alternative test methods where appropriate and warnings on how service/temperature exposure can change thermocouple properties over time.

Typical use and users

Used by thermocouple and thermocouple‑cable manufacturers, test laboratories, quality and reliability engineers, procurement/specification authors, and research groups. Typical applications include incoming inspection, production quality control, acceptance testing for high‑temperature and nuclear or high‑reliability thermocouple assemblies, failure analysis, and supplier qualification.

Related standards

Commonly used alongside or referenced by other ASTM standards in the thermometry and thermocouple family, for example: ASTM E230/E230M (temperature‑EMF tables for standardized thermocouples), ASTM E220 (thermocouple calibration by comparison), ASTM E608/E608M (specification for mineral‑insulated, metal‑sheathed base‑metal thermocouples), ASTM E585/E585M (compacted MIMS thermocouple cable), ASTM E235/E235M (type K/N MIMS for high‑reliability applications), and related guides such as ASTM E1350, E2846, E2821, E344 and others that cover installation, verification, and preparation for calibration.

Keywords

thermocouple; sheathed thermocouple; mineral‑insulated metal‑sheathed (MIMS); thermocouple cable; insulation compaction; sheath integrity; calibration; thermal response time; radiography; thermal cycle; electrical continuity; quality control.

FAQ

Q: What is this standard?

A: ASTM E839-23 is a collection of standardized test methods for sheathed thermocouples and sheathed thermocouple cable (mineral‑insulated, metal‑sheathed assemblies). It describes how to perform a wide range of inspections and measurements used to characterize materials and finished assemblies.

Q: What does it cover?

A: It covers methods for testing insulation properties (compaction, thickness, resistance), sheath properties (integrity, dimensions, wall thickness, surface and metallurgical checks, ductility), thermoelement properties (calibration, homogeneity, drift, geometry), and assembly properties (electrical checks, radiography, thermal response, thermal cycling). It provides procedures but does not set acceptance limits.

Q: Who typically uses it?

A: Thermocouple and cable manufacturers, independent test labs, QA/QC engineers, procurement/spec writers, and technical staff responsible for verification, acceptance, or failure analysis of thermocouple products.

Q: Is it current or superseded?

A: Current — the E839-23 edition is the active edition (approved and effective in 2023) and supersedes the prior E839-11(2016)e1 edition.

Q: Is it part of a series?

A: It belongs to ASTM Committee E20 (Temperature Measurement) work and is used together with related ASTM specifications and guides covering thermocouple materials, calibration, and application (for example E230/E230M, E220, E608/E608M, E585/E585M, and various guides and specifications referenced by those documents).

Q: What are the key keywords?

A: Thermocouple; mineral‑insulated; metal‑sheathed; MIMS; thermocouple cable; insulation compaction; sheath integrity; calibration; thermal response; radiographic inspection; quality control.