ASTM E2251-14(2021)

Annotation of standard text ASTM E2251-14(2021) :

This specification covers liquid-in-glass ASTM thermometers using low hazard thermometric liquids. The gas filling above the liquid shall be nitrogen or other suitable inert gas. The filling gas shall be chosen to have very low solubility in the thermometric fluid. The stem shall be made of suitable thermometer tubing and shall have a plain front and enamel back. The bulb shall be made of glass and the following distances between graduations and the bulb, and between graduations and enlargements in the capillary, are minimum limits acceptable. All graduation lines, figures, and letters shall be clearly defined, suitably colored, and permanent. The width and the sharpness of the graduation lines shall be designed in accordance with necessary space between the graduations and the desired accuracy of interpolation. The middle of the graduation line shall be accurately determinable. In addition, the graduation lines shall be straight, of uniform width, and perpendicular to the axis of the thermometer. On partial immersion thermometers an immersion line shall be permanently marked on the front of the thermometer at the distance above the bottom of the bulb as specified. The immersion inscription shall be written in capital letters and abbreviated. The terminal number shall be in full when there are one or more numbered graduations between it and the next full number. The special inscription specified shall be marked on the thermometer in capital letters and Arabic numbers without the use of periods.


Keywords:
bulb, liquid-in-glass thermometers, low-hazard liquid, standard specification, stem, temperature, thermometer,, ICS Number Code 17.200.20 (Temperature-measuring instruments)