The current international standard that specifies tolerance and the temperature-to-electrical resistance relationship for platinum resistance thermometers ( PRTs ) is IEC 60751 : 2008; ASTM E1137 is also used in the United States.
12.
Such an ebulliometer can be used for extremely accurate measurements of boiling temperature, molecular weights, mutual solubilities, and solvent purities by using a resistance thermometer ( RTD ) to measure the near-equilibrium conditions of the thermowell.
13.
When temperature-dependent resistance of a component is used purposefully, the component is called a resistance thermometer or thermistor . ( A resistance thermometer is made of metal, usually platinum, while a thermistor is made of ceramic or polymer .)
14.
When temperature-dependent resistance of a component is used purposefully, the component is called a resistance thermometer or thermistor . ( A resistance thermometer is made of metal, usually platinum, while a thermistor is made of ceramic or polymer .)
15.
It is important to note that these equations are listed as the basis for the temperature / resistance tables for idealized platinum resistance thermometers and are not intended to be used for the calibration of an individual thermometer, which would require the experimentally determined parameters to be found.
16.
An example of a reference thermometer used to check others to industrial standards would be a platinum resistance thermometer with a digital display to 0.1 �C ( its precision ) which has been calibrated at 5 points against national standards ( " 18, 0, 40, 70, 100 �C ) and which is certified to an accuracy of ?.2 �C.
17.
These included such sensors as the thermocouple ( from the work of Thomas Johann Seebeck ), the resistance thermometer ( by William Siemens based on the work of Humphry Davy ), and the electrical strain gauge ( based on Lord Kelvin's discovery that conductors under mechanical strain change their resistance ) and output devices such as Samuel Morse's telegraph sounder and the relay.
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