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ASTM E77-98(2003)

Historical Reaffirmation

Standard Test Method for Inspection and Verification of Thermometers

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1.1 This test method covers visual and dimensional inspection, test for permanency of pigment, test for bulb stability, and test for scale accuracy to be used in the verification of liquid-in-glass thermometers as specified in Specification E 1. However, these procedures may be applied to other liquid-in-glass thermometers.

Note 1—The use of NIST SP250-23 is recommended.

1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


The test method described in this standard will ensure that the thermometers listed in Specification E 1 will indicate temperatures within the maximum scale errors listed, be compatible with the apparatus, and serve the purpose for which they were designed.Fig. 1

Thermometers that do not pass the visual and dimensional inspection tests may give erroneously high or low temperature readings, or may not fit into existing equipment used in ASTM methods. If the pigment in the scale etchings washes out or fades, the thermometer will be difficult to read. Improper annealing of the bulb, as determined by the bulb stability test, will result in thermometer readings rapidly changing with time and use. For accurate temperature measurements the scale readings of the thermometer should be verified as described in this test method.


FIG. 1 Oven for Permanency of Pigment Test

SDO ASTM: ASTM International
Document Number E77
Publication Date Nov. 1, 2003
Language en - English
Page Count 14
Revision Level 98(2003)
Supercedes
Committee E20.05
Publish Date Document Id Type View
May 1, 2014 E0077-14E01 Revision
May 1, 2014 E0077-14 Revision
Dec. 1, 2007 E0077-07 Revision
Nov. 10, 1998 E0077-98 Revision
Not Available E0077-66 Revision
May 1, 2021 E0077-14R21 Reaffirmation
Nov. 1, 2003 E0077-98R03 Reaffirmation