ASTM E563-02

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Designation:E563–02
Standard Practice for
Preparation and Use of an Ice-Point Bath as a Reference
1
Temperature
This standard is issued under the fixed designation E563; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.3.1 ice-point bath, n—physical system containing ice and
water assembled to realize the ice point as a reference
1.1 Thispracticecoversamethodofpreparing,maintaining,
temperature, or to establish a constant temperature near 0°C.
and using a temperature reference bath of a mixture of shaved
ice and water, saturated with air at a pressure of 101325 Pa (1
4. Summary of Practice
atm).
4.1 The ice-point bath described by this practice consists of
1.2 An industrial practice for relating values referenced to
an intimate mixture, without voids, of pure shaved ice or ice
the ice point and to the water triple point on the ITS-90 is
particles and distilled air-saturated water in a thermally insu-
included.
lating vessel open to the atmosphere.
1.3 Methods to promote uniformity of bath temperature by
4.2 The ice bath realization of the ice point physically
mechanical stirring or agitation are not described in detail.
approximates, with small uncertainty, a natural fixed-point
1.4 Methods of approximating the ice point, as by
temperature.
thermostatically-controlled refrigeration, are not covered by
4.2.1 An ice-point bath prepared using distilled-water ice
this practice.
and air-saturated, chilled distilled water, typically has a tem-
1.5 This standard does not purport to address all of the
perature of 0.000 6 0.002°C. Consequently, when the bath is
safety concerns, if any, associated with its use. It is the
used as a fixed-point temperature reference, the bath tempera-
responsibility of the user of this standard to establish appro-
ture is assumed to be 0°C, with an uncertainty that depends on
priate safety and health practices and determine the applica-
the care with which the bath was established and maintained.
bility of regulatory limitations prior to use.
4.2.2 Theice-pointbathisopentotheatmosphere;theeffect
2. Referenced Documents of barometric pressure on the ice point is−75 nK/Pa (−7.6
mK/atm). The solubility of air in the water is directly propor-
2.1 ASTM Standards:
2 tional to the atmospheric pressure.
D1193 Standard Specification for Reagent Water
4.3 The ice-bath temperature can also be measured with an
E344 Terminology Relating to Thermometry and Hydrom-
3 accurately calibrated thermometer or compared to a water
etry
3
triple point cell and the bath temperature is reported as the
E1594 Guide for Expression of Temperature
measured temperature with an uncertainty that is attributed to
3. Terminology
the measurement, not to the ice point.
3.1 Definitions—Definitions given in Terminology E344,
5. Significance and Use
unless otherwise defined herein, apply to terms as used in this
5.1 This practice is adequate for use with other ASTM
practice.
standards that specify the ice point as a reference. It is also
3.2 Temperature relationships given in Guide E1594, un-
intended to be adequate for most other ice-point reference
less otherwise defined herein, apply to temperature values as
purposes.
used in this practice.
5.2 The ice point is a common practical industrial reference
3.3 Definitions of Terms Specific to This Standard:
point of thermometry. The ice point is relatively simple to
realize and provides a readily available natural fixed-point
1
ThispracticeisunderthejurisdictionofASTMCommitteeE20onTemperature reference temperature.
Measurement and is the direct responsibility of Subcommittee E20.07 on Funda-
5.3 Use in Resistance Thermometry:
mentals in Thermometry.
5.3.1 The ice point was a defining fixed point on practical
Current edition approved October 10, 2003. Published May 2003. Originally
temperature scales prior to 1960.
published as E563–76. Discontinued February 1996 and reinstated as E563–97.
2
Annual Book of ASTM Standards, Vol 11.01.
3
Annual Book of ASTM Standards, Vol 14.03.
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E563–02
5.3.2 TheITS-90definesW(T )=R(T )/R(273.16K),the 7. Procedure
90 90
measured resistance ratio of a Standard Platinum Resistance
7.1 In the practical use of the ice-point bath, two objectives
Thermometer(SPRT),inreferencetothewatertriplepoint,not
shall be accomplished: (1) the bath shall be established and
4
the ice point (1). In many instances, where the water triple
maintained so that its temperature is a good approximation
...