ASTM E77-07 Inspection and Verification of Thermometers

ASTM E77-07 Inspection and Verification of Thermometers

ASTM E77-07 describes visual and dimensional inspection, test for bulb stability, test for permanency of pigment, and test for scale accuracy used in the verification of liquid-in-glass thermometers.

    Scope:

    ASTM E77-07 is crucial to ensure that thermometers used indicate temperatures within the maximum scale and are compatible with the apparatus and the purpose for which they are designed. The procedures are also used for other liquid-in-glass thermometers.

    Procedure

    In ASTM E77-07, first gas bubbles are detected and removed readily. Compliance is determined with lineal dimensional specifications by comparing the thermometer with the appropriate scale or template. For compliance with specifications, the errors in the temperature indications of ASTM thermometers are being verified.

    Specimen size:

    Most thermometers contain mercury as the actuating liquid. Some thermometers use an organic liquid, especially those at temperatures below −56 °C (−69 °F). The partial-immersion thermometers range from approximately 0.3 °C (0.5 °F) to 2.0 °C (3.0 °F).

    Data

    The following equation is used to calculate corrections:

    Emergent stem correction = kn (T- t)

    where:

    k = differential expansion coefficient of the liquid and the glass of which the thermometer is made

    n = number of degrees emergent from the bath,

    T = temperature of the bath, and

    t = average temperature of the liquid column of n degrees.

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