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Helium gas thermometer: Calibrated at three fixed points in this range and interpolated in a specified way. [11] 13.8033 1234.93 11 Platinum resistance thermometer: Resistance calibrated at various fixed points and interpolated in a specified way. Eleven distinct calibration procedures are specified. [8] 1234.93 3 Radiation thermometer
The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...
The Joint Committee for Guides in Metrology (JCGM) is a committee which created and maintains two metrology guides: Guide to the expression of uncertainty in measurement (GUM) [54] and International vocabulary of metrology – basic and general concepts and associated terms (VIM). [33] The JCGM is a collaboration of eight partner organisations ...
However, a common temperature and pressure in use by NIST for thermodynamic experiments is 298.15 K (25 °C, 77 °F) and 1 bar (14.5038 psi, 100 kPa). [4] [5] NIST also uses 15 °C (288.15 K, 59 °F) for the temperature compensation of refined petroleum products, despite noting that these two values are not exactly consistent with each other.
Since most analytical instrumentation is comparative, it requires a sample of known composition (reference material) for accurate calibration. These reference materials are produced under stringent manufacturing procedures and differ from laboratory reagents in their certification and the traceability of the data provided.
Such thermometers are usually calibrated so that one can read the temperature simply by observing the level of the fluid in the thermometer. Another type of thermometer that is not really used much in practice, but is important from a theoretical standpoint, is the gas thermometer. Other important devices for measuring temperature include:
Digital instant-read thermometers: These thermometers provide quick, precise readings, making them ideal for checking turkey temperatures during cooking. Simply insert the probe into the thickest ...
E2758-10 Standard Guide for Selection and Use of Wideband, Low Temperature Infrared Thermometers. E2847-11 Standard Practice for Calibration and Accuracy Verification of Wideband Infrared Thermometers
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