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.
|Published (Last):||8 March 2013|
|PDF File Size:||4.13 Mb|
|ePub File Size:||4.32 Mb|
|Price:||Free* [*Free Regsitration Required]|
Total-Immersion Thermometers—In the case of general purpose total-immersion thermometers, the sensitivity of the thermometers to be tested will govern the choice of standard. By softly tapping on a soft spongy material or against the hand it usually is possible to bring the liquid together in the bulb.
Adjust the dividers to extend over 10 or 20 graduations, and successive intervals can be intercompared rapidly. In reading thermometers, account must be taken of the fact that the lines are of appreciable width.
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 version. If bubbles are observed in the bulb, they can generally be removed by cooling the bulb zstm dry ice or other convenient coolant until all the liquid is drawn into the bulb.
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 black astmm, products of glass weathering commonly called white deposit, and stones or iron spots traceable to faulty glass fabrication. Inspection for uniformity of spacing can generally be accomplished by eye, but for greater accuracy a pair of dividers may be used to advantage.
A number in parentheses indicates the year of last reapproval. Select clear pieces of ice or ice made from distilled or pure water. Successive readings taken a.
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. Allow the thermometer to cool as described in and then repeat the procedures described in and.
If any portion of the stem containing mercury is exposed, the emergent mercury column correction should be determined. 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 to 12 h of exposure. A superscript epsilon indicates an editorial change since the last revision or atsm.
ASTM E77 – 14e1
Please first verify your email before subscribing to alerts. Improper annealing of the bulb, as determined by the bulb stability test, will result in thermometer readings rapidly changing with time and use. Standards Subsctiption may be the perfect solution. Subscription pricing is determined by: Normally, the effect astn taper in the capillary or nonlinearity in the expansion characteristics of organic liquids is manifested by a gradual change in the spacing of the graduations.
Current edition approved Nov. Scale corrections should always be applied in the use of these standards. You can download and open this file to your own computer but DRM prevents w77 this file on another computer, including a networked server.
These thermometers can be used as standards to calibrate other thermometers similar 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.
ASTM E77 – 14e1 – Standard Test Method for Inspection and Verification of Thermometers
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. In some instances total-immersion thermometers may be used under conditions of complete immersion. If the document is revised or amended, you will be notified by email.
Rinse the ice with distilled water and shave or crush into small pieces, avoiding direct contact with the hands or any chemically unclean objects. It is frequently a good practice to immerse only the bulb of the thermometer.
This standard is not included in any packages. 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.
This standard has been approved for use by agencies of the Department of Defense. The change in ice-point reading should then be applied to all readings. Originally published as E 77 — 49 Atsm. Discard any cloudy or unsound portions. Allow to cool slowly.
ASTM E77 – 14 Standard Test Method for Inspection and Verification of Thermometers
When the column itself follows into the chamber, the separated portion usually will join onto the main column. This is due to the effect of increased gas pressure above the column producing a distortion of the bulb. Recalibration is performed as described in 6. Aztm have no amendments or corrections for this standard. No method has been discovered that will entirely prevent such displacement of the gas.