ASTM E780–06 Measuring the Insulation Resistance of Mineral-Insulated, Metal-Sheathed Thermocouples, and Thermocouple Cable at Room Temperature

ASTM E780–06 Measuring the Insulation Resistance of Mineral-Insulated, Metal-Sheathed Thermocouples, and Thermocouple Cable at Room Temperature

The procedures for measuring the room temperature electrical insulation resistance between the thermoelements, as well as between the thermoelements and a mineral-insulated, metal-sheathed thermocouple's sheath or cable thermocouple are covered in ASTM E780 – 06. The values given in SI units are considered standard.

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    When subjected to high temperatures, thermocouples produced from thermocouple cable that has been polluted by moisture or other impurities may experience significant changes in thermoelectric qualities or fail catastrophically. Manufacturers and users of mineral-insulated, metal-sheathed thermocouples or thermocouple cables use ASTM E780 – 06 to verify the measured insulation resistance values to meet the prescribed minimum value.


    Measuring the insulation resistance between all thermoelements in a thermocouple necessitates removing the hot junction, testing is limited to measuring the insulation resistance between thermoelement pairs where possible, and between the thermoelement pairs and the thermocouple’s sheath.

    Specimen size

    An instrument such as a megohm bridge or megohmmeter is used to measure resistance.
    Room temperature (22± 5°C (72 ± 10°F)) dc electrical insulation resistance
    (l) Length of thermocouple cable, between each of the thermoelements and between the thermoelements and the sheath.


    Test voltage range= 50 – 500 VDC

    Measurement ranges= 1 × 105 Ω- 1 ×1012Ω

    Accuracy of reading= ±10%


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