Significance and Use
This test method provides a description of test methods used in ASTM specifications that establish certain acceptable limits for characteristics of thermocouple assemblies and thermocouple cable.
The intended use of these test methods is to define the methods by which the characteristics shall be determined.
The usefulness and purpose of the included tests are given for the category of tests.
1. Scope
1.1 These are test methods for sheathed thermocouple material and assemblies.
1.2 The tests are intended to ensure quality control and to evaluate the suitability of sheathed thermocouple material or assemblies for specific applications. Some alternative test methods to obtain the same information are given, since in a given situation an alternative test method may be more practical. Service conditions are widely variable and so it is unlikely that all the tests described will be appropriate for a given thermocouple application. A brief statement is made following each test description to indicate when it might be used.
1.3 The tests described herein include test methods to measure the following properties of sheathed thermocouple material and assemblies.
1.3.1 Insulation PropertiesCompaction-absorption method and tension method.
Thickness.
Resistance-room temperature and elevated temperature.
1.3.2 Sheath PropertiesIntegrity-water test (two test methods) and mass spectrometer.
Dimensions-length, diameter, and roundness.
Wall thickness.
Surface-gross visual, finish, defect detection by dye penetrant, and cold-lap detection by tension test.
Metallurgical structure.
Ductility-bend test and tension test.
1.3.3 Thermoelement PropertiesCalibration.
Homogeneity.
Drift.
Thermoelement diameter, roundness, and surface appearance.
Thermoelement spacing.
Thermoelement ductility.
Metallurgical structure.
1.3.4 Thermocouple Assembly PropertiesDimensions-length, diameter, and roundness.
Surface-gross visual, finish, reference end seal, and defect detection by dye penetrant.
Electrical-continuity, loop resistance, and connector polarity.
Radiographic inspection.
Thermoelement diameter.
Thermal response time.
Thermal cycle.
2. Referenced Documents
D2771 Test Methods for Compaction Density of Electrical Grade Magnesium Oxide
E112 Test Methods for Determining Average Grain Size
E1129/E1129M Specification for Thermocouple Connectors
E1350 Guide for Testing Sheathed Thermocouples Prior to, During, and After Installation
E142 Method for Controlling Quality of Radiographic Testing
E165 Test Method for Liquid Penetrant Examination
E1684 Specification for Miniature Thermocouple Connectors
E1751 Guide for Temperature Electromotive Force (emf) Tables for Non-Letter Designated Thermocouple Combinations
E207 Test Method for Thermal EMF Test of Single Thermoelement Materials By Comparison with a Reference Thermoelement of Similar EMF-Temperature Properties
E2181/E2181M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Noble Metal Thermocouples and Thermocouple Cable
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
E230 Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
E235 Specification for Thermocouples, Sheathed, Type K and Type N, for Nuclear or for Other High-Reliability Applications
E3 Practice for Preparation of Metallographic Specimens
E344 Terminology Relating to Thermometry and Hydrometry
E585/E585M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Base Metal Thermocouple Cable
E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples
E780 Test Method for Measuring the Insulation Resistance of Sheathed Thermocouple Material at Room Temperature
E94 Guide for Radiographic Examination
E988 Temperature-Electromotive Force (EMF) Tables for Tungsten-Rhenium Thermocouples
B 46.1 Surface Texture
Index Terms
high temperature insulation test; insulation resistance; sheath integrity; sheathed thermocouple; thermal cycle; thermal response time; thermocouple; thermocouple assembly properties; thermoelement; thermoelement properties
DOI: 10.1520/E0839-05
ASTM International is a member of CrossRef.
Citing ASTM Standards
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