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ASTM E2251-14(2021)
Standard Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids
NORMA vydaná dňa 1.12.2021
Informácie o norme:
Označenie normy: ASTM E2251-14(2021)
Dátum vydania normy: 1.12.2021
Kód tovaru: NS-1044047
Počet strán: 18
Približná hmotnosť: 54 g (0.12 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy 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)
Doplňujúce informácie
| 1. Scope | ||||||||
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1.1?The purpose of this standard is to specify liquid-in-glass ASTM thermometers using low hazard thermometric liquids defined in this standard. 1.2?This standard specifies liquid-in-glass thermometers graduated in degrees Celsius or degrees Fahrenheit that are frequently identified and used in methods under the jurisdiction of the various technical committees within ASTM. The current approved thermometers are listed in Table 1. 1.3?The technical requirements for the thermometric liquids used in the thermometers in Table 1 are specified in Annex A1. Tests for conformity to the technical requirements are also found in Annex A1. Note 1:?It has been found by experience that ASTM
Thermometers, although developed in general for specific tests, may
also be found suitable for other applications, thus precluding the
need for new thermometer specifications differing in only minor
features. However, it is suggested that technical committees
contact E20.05 before choosing a currently designated thermometer
for a new method to be sure the thermometer will be suitable for
the intended application.
1.4?For full rationale, see Appendix X1. 1.5?This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. 1.6?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||
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