Purchase your copy of ASTM E – 11() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. Find the most up-to-date version of ASTM E at Engineering Designation: E – 11Standard Practice for Preparation and Use of an Ice-Point Bath as 1 This practice is under the jurisdiction of ASTM Committee E20 on.
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous e653. Because it may not be technically possible to adequately depict s563 changes accurately, ASTM recommends that users consult prior editions as appropriate.
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Norma ASTM E()
A superscript astmm indicates an editorial change since the last revision or reapproval. It xstm 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.
Current edition approved Nov. Originally published as E — Discontinued February and reinstated as E — Summary of Practice asym. The solubility of air in the water is directly proportional to the atmospheric pressure.
It is also intended to be adequate for most other ice-point reference purposes. The uniformity of temperature of the bath can be enhanced by slowly stirring or agitating the slush of ice and water either manually or by a powered stirring means so that all of the ice and water in the bath come into intimate contact.
Also, some of aetm water may freeze and ast some of the particles. Use of the bath must be delayed long enough to establish thermal equilibrium, and the particles shall be sufficiently small so that the bath approaches the required state of ice and air-saturated water in intimate contact.
Thoroughly rinse the equipment with tap water, then rinse with the type of water used for the ice-point bath medium. Use clean plastic gloves to handle the ice and equipment.
Freeze another portion of the water to produce ice for the aatm. Shaved ice resembling snow is preferred, but crushed ice is acceptable if the particles are small not exceeding 2 to 3 mm diameter. For usual applications, a diameter of at least 70 mm and a depth of at least mm may be adequate. Decant or siphon off excess water. Use an opaque and thermally insulating cover or stopper that is suitable for the application.
Allow the bath and vessel to equilibrate for at least 30 minutes before using. This reduces the time to reach equilibrium at the ice point. Cooling helps to preserve the bath at the ice point for prolonged use.
For thermoelectric asym of high thermal conductivity, as much as mm immersion may be necessary.
For partial immersion liquid-in-glass thermometers, immerse to the immersion line or stated immersion depth. NOTE 1—When liquid-in-glass thermometers are tested in an ice point bath, the bath may be left uncovered. The loss of precision between a covered and uncovered bath may be below the resolution of liquid-in-glass thermometers. The user must test for this condition.
For this reason surplus water should be removed, as it accumulates, from the bottom of the bath by decanting or siphoning.
The presence of excess water can be detected if water overspill occurs when the ice is depressed. Add ice particles, and chilled water, as necessary so that the ice slush column always extends to at least 30 mm below the lowest point of the test object. Precision and Bias 8. E653 in the water usually lower the temperature.
Excessive water in the bath can cause an increase in temperature as denser warm water settles to the bottom. Large chunks of very cold ice added to a bath can produce local temperature depression. Temperature differences of 0. The temperature is lowered by about 6. There is a corresponding effect for changes in atmospheric pressure. In most cases, pressure effects can be ignored 4.
A water-ice interface in the bath acts as a heat sink.
As ice melts, the interface moves away from the test object, and a temperature difference, which can be as much as several kelvins, is established between the test object and the heat sink.
At steady state conditions, an error results that depends primarily on the thermophysical properties of the object, its dimensions and its depth of immersion in the ice-point bath. The temperature increase depends on the electric power being dissipated and the thermal resistance between the sensor and the water-ice interface.
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