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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No method has been discovered that will entirely prevent such displacement of the gas.
Temperatures are not measured directly with this instrument. It is the responsibility of the user of this standard to establish ast, safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. In the case of diameter measurements, the bulb or other portions of the thermometer being tested should not enter the smaller of the holes in the ring gage see 5.
Already Subscribed to this document. Successive readings taken a. In some instances total-immersion thermometers may be used under conditions of complete immersion. Discard any cloudy or unsound portions.
ASTM E77 – 14e1
Inspection for uniformity of spacing can generally be accomplished by eye, qstm for greater accuracy a pair of dividers may be used to advantage. Originally published as E 77 — 49 T. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. The bulb should be allowed to warm up slowly. Heat the thermometer again to the selected reference point e777 the main scale, keep it at this temperature for h.
Allow the thermometer to cool as described in and then repeat the procedures described in and. A number in parentheses indicates the year of last reapproval.
Strains in the glass as observed with a polarized light strain gage near enlargements in the stem or bore, or at the top of the thermometer, are detrimental. Discontinuities in the spacing are asrm of faulty graduating.
Return the thermometer to the bath, preheated to the temperature of test, and heat for 24 h. Such thermometers should always be inspected for these separations, which can be repaired by the procedures described above. Asgm pricing is determined by: This standard is also available to be included in Standards Subscriptions.
Select clear pieces of ice or ice made from distilled or pure water. If the document atm revised or amended, you will be notified by email. 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. It is only necessary to have a liquid-in-glass thermometer completely calibrated one time.
This keeps the viscosity of the liquid in the capillary low and aids in hastening drainage. Current edition approved Nov. Adjust the dividers to extend over 10 or 20 graduations, and successive intervals can be intercompared rapidly. 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. Scale corrections should always be applied in the use of these standards.
In all cases only the current version of the standard as published by ASTM is to be considered the official document. Thermometers that have a contraction chamber below the lowest graduation are likely to develop separations either in the chamber or above it. Heat the thermometer to the selected reference point on the main scale, maintain the temperature for at least 15 min, and determine the scale correction at this point. Need more than one copy? Please first log in with a verified email before subscribing to alerts.
If a mercury separation is observed in the stem, several different ways are suggested for joining the columns, depending on the construction of the thermometer and the type of separation. For more stubborn separations it may be necessary to cool the bulb in dry ice to a point low enough to bring all of the liquid into the bulb itself.
Burning out, loosening, chalking, or fading of the pigment shall be cause for rejection. A slight tapping of the 4 E 77 — 98 thermometer against the palm of the hand will facilitate this joining.
ASTM E77 – 98 Rpdf全文-调研报告-在线文档
Last previous edition approved in as E 77 — It is 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. 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.
In reading thermometers, account must be taken of the fact that the lines are of appreciable width.