ASTM E77 PDF

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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Temperatures may then be calculated using suitable resistance- temperature equations. Secondary standards may be of the following types.

Allow the thermometer to cool as described in and then repeat the procedures described in and.

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 ee77. 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. Gentle tapping of the thermometer while held upright will cause the bubbles to rise to the surface.

Rinse the ice with distilled water and shave or crush into small pieces, avoiding direct contact with the hands or any chemically unclean objects. Proceed to Checkout Continue Shopping.

It is frequently a good practice to immerse only the bulb of the thermometer. In all e777 only the current version of the standard as published by ASTM is to be considered the official document. If natural cooling in still air is used, determine the reference reading within 1 h.

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ASTM E77 – 98 Rpdf全文-调研报告-在线文档

In some instances total-immersion thermometers may be used under conditions of complete immersion. Some that are considered essential to this standard are given below. Subscription pricing is determined by: The thickness of such gages should approximate the diameters of the holes to minimize errors resulting from the axis of the thermometer stem being other than normal to the plane of the gage. 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.

It astn 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.

ASTM E77 – 14e1 – Standard Test Method for Inspection and Verification of Thermometers

Strains in the glass as observed with a polarized light strain gage near enlargements in the stem or bore, or at e777 top of the thermometer, are detrimental. Total-Immersion Sstm the case of general purpose total-immersion thermometers, the sensitivity of the thermometers to be tested will govern the choice of standard. 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.

ASTM E77 – 14e1

If the pigment in the scale etchings washes out or fades, the thermometer will be difficult to read. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations astn to use. No method has been discovered that will entirely prevent such displacement of the gas. The bulb should be allowed to warm up slowly. In astn 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.

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For fractionally graduated thermometers a calibrated set of the following thermometers is recommended. Current edition approved Nov.

E7 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.

Heat the thermometer again to the selected reference point on the main scale, keep it at this temperature for h.

Originally published as E 77 — 49 T. This is due to the effect of increased gas pressure above the column producing a distortion of the bulb. Scale corrections should always be applied in the use of these standards. In reading thermometers, account must be taken of the fact that the lines are of appreciable width. We have no amendments or aztm for this standard.