E77 – 98 Standard Test Method for Inspection and Verification of Thermometers, Calibration-temperature instrumentation, Liquid-in-glass thermometers. Inspection and Verification of Thermometers, is based on ASTM E77 − 14, Standard. Test Method . E1 Specification for ASTM Liquid-in-Glass Thermometers. Buy ASTM E() Standard Test Method for Inspection and Verification of Thermometers from SAI Global.

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Select clear pieces of ice or ice made from distilled or pure water. Burning out, loosening, chalking, or fading of the pigment xstm be cause for rejection. However, these procedures may be applied to other liquid-in-glass thermometers. We have no amendments or corrections for this standard. Asstm natural cooling is used, the correction should be determined within 1 h.

As the voice of the U. Adjust the dividers to extend over 10 or 20 graduations, and successive intervals can be intercompared rapidly. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

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The magnitude of any change in this reference reading as a result of the h heating period is a measure of the quality of the bulb glass and the adequacy of the previous heat treatment accorded the thermometer in manufacture.

If the document is revised or amended, you will be notified by email. These thermometers can be used as standards to calibrate other thermometers w77 in all details of construction above the immersion point, but may differ below the immersion point to the extent of including an auxiliary ice point scale. The bulb should be allowed to warm up slowly. They are simpler to use than a primary standard thermometer with its accessory equipment, the latter being capable of an order of precision and accuracy far in excess of that attainable qstm liquid-in-glass thermometers.

Atsm some instances total-immersion thermometers may be used under conditions of complete immersion. This document is not an ASTM standard and is intended only to asm the user of an ASTM standard an indication of what changes have been made to the previous version.

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If bubbles are observed in the bulb, they can generally be removed by cooling the bulb with dry ice or other convenient coolant until all the liquid is drawn into the bulb. For more stubborn separations it may be necessary to asgm the bulb in dry ice to a point low enough to bring all of the liquid into the bulb itself. Thermometers that have a contraction chamber below the lowest graduation are likely to develop e7 either in the chamber or above it.

A superscript epsilon indicates an editorial change since the last revision or reapproval. It must be emphasized that to obtain meaningful results, the procedure adopted after the h period of heating must be identical to that used in the original calibration.

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Add to Alert PDF. Its electrical resistance is determined by comparison with a standard resistor, using a potentiometer, a Kelvin-type double bridge, or a Wheatstone bridge, preferably of the Mueller type or an AC resistance bridge.

In all cases only the current version of the standard as published by ASTM is to be considered the official document. If the pigment in the scale etchings washes out or fades, the thermometer will be difficult to read. Current edition approved Nov. More complete information on the construction and use of primary standard thermometers may be obtained from NIST SP If a small portion of the liquid has separated at the top of the column and the thermometer is provided with an expansion chamber, the liquid usually can be joined by carefully and slowly heating the bulb until the separated portion is driven into the expansion chamber.

In reading thermometers, account must be taken of the fact that the lines are of appreciable width.

ASTM E77 – 14e1

Inspection for uniformity of spacing can generally be accomplished by eye, but for greater accuracy a pair of dividers may be used to advantage. Allow the thermometer to cool as described in and then repeat the procedures described in and. In the case of ASTM thermometers, the diameter limits apply over the entire length of the section of the thermometer being tested.

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Discontinuities in the spacing are evidence of faulty graduating. They should be completely recalibrated every 6 to 12 months, depending upon the temperatures of usage. When the column itself follows into the adtm, the separated portion usually will join onto the main column. The change in ice-point reading should then be applied to all readings. As the ice melts it will be necessary to drain off some of the water and add more crushed ice. Metal adtm baths and the salt and tin comparator baths, described in Appendix X1, are examples of the type of equipment that has been found to be suitable for this purpose.

ASTM E77 – 98 Standard Test Method for Inspection and Verification of Thermometers

Subscription pricing is determined by: In order that it shall be satisfactory for such use, the thermometer should meet the requirement that the ratio of resistances at the steam and ice points shall be greater than 1.

Aastm fractionally graduated thermometers a calibrated set of the following thermometers is recommended. Inspect the thermometer for differences in appearance of the tested and untested sections of the scale portion. You may delete a document from your Asfm Profile at any time.

Discard any cloudy or unsound portions. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Under these conditions oxidation of the mercury will occur and will normally be evidenced by the production of crystals of red oxide of mercury after 10 aetm 12 h of exposure.

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The choice of a secondary standard will be governed by various factors. Any stones or striae that distort the bore or its appearance should be cause for rejection. It is only necessary to have a liquid-in-glass thermometer completely calibrated one time. A astn in parentheses indicates the year of last reapproval.