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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Current edition approved Nov. By softly tapping on a soft spongy material or against the hand it usually d77 possible to bring the liquid together in the bulb.
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 ashm. If natural cooling in still air is used, determine the reference reading within 1 h.
As the voice of the U. In all cases only the current version of the standard as published by ASTM is to be considered aatm official document. In reading thermometers, account must be taken of the fact that the lines are of appreciable width. It is frequently a good practice w77 immerse only the bulb of the thermometer. 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.
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.
ASTM E77 – 07 Standard Test Method for Inspection and Verification of Thermometers
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. This standard has been approved for use by agencies of the Department of Defense. This standard is not included in any packages.
Select clear pieces of ice or ice made from distilled or pure water. If the document is revised or amended, you will be notified by email. We have no amendments or corrections for this standard.
Please first verify your email before subscribing to alerts. 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. Inspect the thermometer for differences in appearance of the tested and untested sections of the scale portion. Recalibration is performed as described in 6. Add to Alert PDF. 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.
The liquid should emerge into the bore with no separation. Standards Subsctiption may be the perfect solution. Metal block baths and the salt and tin comparator baths, described in Appendix X1, are examples of the type of equipment that has been found to be suitable for this purpose.
Ice points should be taken every 3 months. Its atsm 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 ast.
ASTM E77 – 14e1 Standard Test Method for Inspection and Verification of Thermometers
It is only necessary to have a liquid-in-glass thermometer completely calibrated one time. If the pigment in the scale etchings washes out or fades, the thermometer will zstm difficult to read.
In some instances total-immersion thermometers may be used under conditions of complete immersion. Your Alert Profile lists the documents that will be monitored. 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.
In the case of ASTM thermometers, the diameter limits apply over the entire length of the section of the thermometer being tested.
ASTM E77 – 14e1
Gentle tapping of the thermometer while held upright will cause the bubbles to rise to the surface. 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. 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.