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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As the ice melts it will be necessary to drain off some of the water and add more crushed ice. It is only necessary to have a liquid-in-glass thermometer completely calibrated one time.
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. Recalibration is performed as described in 6.
Temperatures may then be calculated using suitable resistance- temperature equations. The choice of a secondary standard will be governed by various factors. 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 possible to join such separations by cooling the thermometer so that the separated portion as well as the main column both stand in the chamber.
Add to Alert PDF. 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. It is frequently a good practice to immerse only the bulb of the thermometer.
When the column itself follows into the chamber, the separated portion usually will join onto the main column.
Tapping the tube against the hand or the bulb on a soft spongy material, such as a rubber stopper, usually will bring the liquid together. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
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. 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. A superscript epsilon indicates an editorial change since the last revision or reapproval.
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As the voice of the U. The liquid should emerge into the bore with no separation.
Mercury, or its vapor, may be hazardous to health and corrosive to materials. If bubbles are observed in the bulb, they asstm generally be removed by cooling the bulb with dry ice or other convenient coolant until all the liquid is drawn into the bulb. This standard has been approved for use by agencies of the Department of Defense.
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 with liquid-in-glass thermometers. If a small portion of aastm 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 axtm the bulb until the separated portion is driven into the expansion chamber.
ASTM E77 – 14e1
This standard is not included in any packages. Normally, the effect of 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. Heat the thermometer to the selected reference point on the main scale, maintain the axtm for at least 15 min, and determine the scale correction at this point.
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.
ASTM E77 – 07 Standard Test Method for Inspection and Verification of Thermometers
Temperatures are not measured directly with this instrument. Please first verify your email before subscribing to alerts. 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.
Return the thermometer to the bath, preheated to the temperature of test, and heat for 24 h. Allow the thermometer to cool as described in and then repeat the procedures described in and. This is due to the effect of increased gas pressure above the column producing a distortion of the bulb.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including atm networked server.
The thickness of such gages should approximate the diameters of the holes s77 minimize errors resulting from the axis of the thermometer stem being other than normal to the plane of the gage.
If any portion of the stem containing mercury is exposed, the emergent atm column correction should be determined. Organic liquids as used in thermometers, in contrast to mercury, wet the glass. Select clear pieces of ice or ice made from distilled or pure water.
Need more than one copy? Discard any cloudy or unsound portions. 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.
ASTM E77 – 14e1 – Standard Test Method for Inspection and Verification of Thermometers
Standards Subsctiption may be the perfect solution. Any stones or striae that distort the bore or its appearance should be cause for rejection.
This keeps the viscosity of the w77 in the capillary low and aids in hastening drainage. However, these procedures may be applied to other liquid-in-glass thermometers. The change in ice-point reading should then be applied to all readings.
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. A slight tapping of the 4 E 77 — 98 thermometer against the palm of the hand will facilitate this joining.
More complete information on the construction and use of primary standard thermometers may be obtained from E7 SP Adjust the dividers to extend over 10 or 20 graduations, and successive intervals can be intercompared rapidly.