ASTM E77-98(2003)
(Test Method)Standard Test Method for Inspection and Verification of Thermometers
Standard Test Method for Inspection and Verification of Thermometers
SIGNIFICANCE AND 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
SCOPE
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.
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Designation: E 77 – 98 (Reapproved 2003)
Standard Test Method for
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Inspection and Verification of Thermometers
ThisstandardisissuedunderthefixeddesignationE77;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.3 partial-immersion thermometer, n—a liquid-in-glass
thermometer designed to indicate temperature correctly when
1.1 This test method covers visual and dimensional inspec-
the bulb and a specified part of the stem are exposed to the
tion,testforpermanencyofpigment,testforbulbstability,and
temperature being measured.
test for scale accuracy to be used in the verification of
3.1.4 total-immersion thermometer, n—a liquid-in-glass
liquid-in-glass thermometers as specified in Specification E1.
thermometer designed to indicate temperature correctly when
However, these procedures may be applied to other liquid-in-
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just that portion of the thermometer containing the liquid is
glass thermometers.
exposed to the temperature being measured.
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NOTE 1—The use of NIST SP250-23 is recommended.
3.2 Definitions of Terms Specific to This Standard:
1.2 This standard does not purport to address all of the 3.2.1 calibration, n—thedeterminationoftheindicationsof
safety problems, if any, associated with its use. It is the a thermometer with respect to temperatures established by a
responsibility of the user of this standard to establish appro- standard resulting in scale corrections to be applied when
priate safety and health practices and determine the applica- maximum accuracy is required.
bility of regulatory limitations prior to use. 3.2.2 reference point, n—a temperature at which a ther-
mometer is checked for changes in the bulb volume.
2. Referenced Documents
3.2.3 verification, n—the process of testing a thermometer
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2.1 ASTM Standards:
for compliance with specifications.
E1 Specification for ASTM Thermometers 3.2.4 verification temperatures, n—the specified tempera-
E344 Terminology Relating to Thermometry and Hydrom-
tures at which thermometers are tested for compliance with
etry scale error limits.
3.2.5 Other descriptions of terms relating to thermometers
3. Terminology
are included in Sections 3 and 17 of Specification E1.
3.1 Definitions:
4. Significance and Use
3.1.1 The definitions given in Terminology E344 apply.
Some that are considered essential to this standard are given
4.1 The test method described in this standard will ensure
below. that the thermometers listed in Specification E1 will indicate
3.1.2 complete-immersion thermometer, n—a liquid-in-
temperatures within the maximum scale errors listed, be
glass thermometer, not specified in ASTM documents, de- compatiblewiththeapparatus,andservethepurposeforwhich
signed to indicate temperature correctly when the entire
they were designed.Fig. 1
thermometer is exposed to the temperature being measured. 4.2 Thermometers that do not pass the visual and dimen-
sional inspection tests may give erroneously high or low
temperature readings, or may not fit into existing equipment
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This test method is under the jurisdiction of ASTM Committee E20 on
used in ASTM methods. If the pigment in the scale etchings
Temperature Measurement and is the direct responsibility of Subcommittee E20.05
on Liquid-in-Glass Thermometers and Hydrometers. washes out or fades, the thermometer will be difficult to read.
Current edition approved Nov. 1, 2003. Published November 2003. Originally
Improper annealing of the bulb, as determined by the bulb
approved in 1949. Last previous edition approved in 1998 as E 77–98.
stability test, will result in thermometer readings rapidly
2
“Liquid-in-GlassThermometer Calibration Service,” NISTSpecial Publication
changing with time and use. For accurate temperature mea-
250-23, 1988, Superintendent of Documents, U.S. Government Printing Office,
Washington, DC 20402-9325.
surements the scale readings of the thermometer should be
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
verified as described in this test method.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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E 77 – 98 (2003)
FIG. 1 Oven for Permanency of Pigment Test
5. Apparatus 5.5 Metal Block Baths—The bulb stability test may be
conducted with a variety of devices. Metal block baths and the
5.1 Graduated Metal Scales o
...
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