ASTM E100-05

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Designation: E100 – 05
Standard Specification for
1
ASTM Hydrometers
This standard is issued under the fixed designation E100; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) 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 3.2.3 total length, n—overall length of the finished hydrom-
eter.
1.1 This specification covers glass hydrometers of various
scale graduation systems, as required by the ASTM Test
4. Specifications
Methods in which they are used.
4.1 Individual hydrometers shall conform to the detailed
1.2 This standard does not purport to address all of the
specifications in Table 1 and to the general requirements
safety concerns, if any, associated with its use. It is the
specified in Sections 5-15.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
NOTE 1—Changes in this specification may be made from time to time
bility of regulatory limitations prior to use. which do not affect the basic characteristics of the hydrometers. Hydrom-
eters manufactured prior to the adoption of the specifications will retain
2. Referenced Documents
the same official status as those meeting current specifications.
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2.1 ASTM Standards:
5. Type
D287 Test Method forAPI Gravity of Crude Petroleum and
5.1 Hydrometers shall be of the constant-mass, variable-
Petroleum Products (Hydrometer Method)
displacement type. Hydrometers shall be made of glass, except
D1250 GuideforUseofthePetroleumMeasurementTables
for the scale, ballasting material, and the thermometric liquid
E1 Specification for ASTM Liquid-in-Glass Thermometers
of thermohydrometers.
E77 Test Method for Inspection and Verification of Ther-
5.2 The outer surface of the stem and body shall be
mometers
symmetrical about the vertical axis. There shall be no uneven
E126 Test Method for Inspection, Calibration, and Verifica-
or unnecessary thickening of the walls, and no abrupt changes
tion of ASTM Hydrometers
or constrictions that would hinder thorough cleaning or tend to
E344 Terminology Relating to Thermometry and Hydrom-
trap air bubbles when the instrument is immersed.
etry
5.3 The hydrometer shall always float with its axis vertical.
3. Terminology 5.4 The hydrometer shall be thoroughly dry on the inside
when sealed. The top of the stem shall be neatly rounded
3.1 Definitions—The definitions given in Terminology
without unnecessary thickening.
E344 apply.
5.5 The glass shall be smooth, transparent, and free of
3.2 Definitions of Terms Specific to This Standard:
bubbles, striae, or other imperfections that might interfere with
3.2.1 length of the scale, n—length of the nominal range in
the use of the hydrometer. The glass shall adequately resist the
thestem,notincludinggraduationsextendingaboveandbelow
reaction of chemical agents to which hydrometers may be
the nominal limits.
exposed, and also shall have suitable thermal properties to
3.2.2 top of the hydrometer, n— top of the finished instru-
permit its use over the range of temperatures to which it may
ment.
be subjected. In general, glasses suitable for constructing the
bulbs of thermometers are satisfactory for hydrometers.
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This specification is under the jurisdiction of ASTM Committee E20 on
5.6 The API hydrometers are intended to be used in con-
Temperature Measurement and is the direct responsibility of Subcommittee E20.05
junction with Test Method D287, hydrometer readings being
on Liquid-in-Glass Thermometers and Hydrometers.
corrected using Guide D1250, IP 200. Therefore, these hy-
Current edition approved May 1, 2005. Published May 2005. Originally
approved in 1953. Last previous edition approved in 2003 as E100 – 03. DOI:
drometersshallbemadeofglasshavingacubicalcoefficientof
10.1520/E0100-05.
expansion of approximately 0.000023/1°C or 0.0000128/1°F
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
15.56°C (60°F).
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the ASTM website.
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E100 – 05
6. Body may be anchored by a design which prevents it from moving;
otherwise it shall be fixed in place with a cement that will not
6.1 The preferred shapes for the bodies of hydrometers are
soften below 105°C (221°F) and will not deteriorate with time.
shown in Figs. 1 and 2.
The paper shall show no evidence of s
...