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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Such thermometers should always be inspected for these separations, which can be repaired by the procedures described above. A slight tapping of the 4 E 77 — 98 thermometer against the palm of the hand will facilitate this joining. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Suitable types are described in Appendix X1.
Standards Adtm may be the perfect solution. No method has been discovered that will entirely prevent such displacement of the gas. The bulb should be allowed to warm up slowly. Allow the thermometer to cool as described in and then repeat the procedures described in and.
ASTM E77 – 14e1
Metal block baths and the salt and tin comparator baths, described in Appendix X1, are examples of the type of astmm that has been found to be suitable for this purpose. This keeps the viscosity of the liquid in the capillary low and aids in hastening drainage.
Your Alert Profile lists atsm documents that will be monitored. Originally published as E 77 — 49 T. For fractionally graduated thermometers a calibrated set of the following thermometers is recommended.
Need more than one copy? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of asm limitations prior to use. Select clear pieces of ice or ice made from distilled or pure water.
ASTM E77 – 14e1 – Standard Test Method for Inspection and Verification of Thermometers
You may delete a document from your Alert Profile at any time. It is frequently a good practice to immerse only the bulb of the thermometer. In all cases only the current version of the standard as published by ASTM is to be considered the official document. Return the thermometer to the bath, preheated to the temperature of test, and heat for 24 h.
When the column itself follows into the chamber, the separated portion usually will join onto the main column.
e7 Because it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. Secondary standards may be of the following types.
Add to Alert PDF. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Last previous edition approved in as E 77 — Organic liquids as used in thermometers, in atm to mercury, wet the glass.
Inspect the thermometer for differences in appearance of the tested and untested atsm of the scale portion. Rinse the ice with distilled water 7e7 shave or crush into small pieces, avoiding direct contact with the hands or any e7 unclean objects. If any portion of the stem containing mercury is exposed, the emergent mercury column correction should be determined.
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.
The change in ice-point reading should then be applied to all readings. The most common types of foreign matter which should be cause for rejection are glass chips, particles of dirt or lint, oxide of mercury either red, yellow, or blackproducts of glass weathering commonly called white deposit, and stones or iron spots traceable to faulty glass fabrication. This standard is also available to be included in Standards Subscriptions.
The liquid should emerge into the bore with no separation. Allow the thermometer to cool, at the same rate as at the start of the test, to the temperature referred to above, and redetermine the reference reading under the same conditions as before.
This standard is not included in any packages. Please first verify your email before subscribing to alerts. Strains in the glass as observed with a polarized light strain gage near enlargements in the stem or bore, or at the top of w77 thermometer, are detrimental.
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 wstm usually can be joined by carefully and slowly heating the bulb until the separated portion is driven into the expansion chamber. 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 e7 into the bulb.
A number in parentheses indicates the year of last reapproval.