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Twenty-seven thermocouples made of 20-, 30-, and 40-mil diameter elements drawn from three separate melts of the positive and negative alloys were calibrated. Three equations for three temperature ranges were found to fit the averaged data of all thermocouples with a maximum deviation of only 9 microvolts.
The impure gold wire gives the thermocouple a high sensitivity at low temperatures (compared to other thermocouples at that temperature), whereas the chromel wire maintains the sensitivity near room temperature. It can be used for cryogenic applications (1.2–300 K and even up to 600 K). Both the sensitivity and the temperature range depend on ...
If process temperatures are between −200 and 500 °C (−328.0 and 932.0 °F), an industrial RTD is the preferred option. Thermocouples have a range of −180 to 2,320 °C (−292.0 to 4,208.0 °F), [9] so for temperatures above 500 °C (932 °F) it is the contact temperature measurement device commonly found in physics laboratories.
In the table below are Seebeck coefficients at room temperature for some common, nonexotic materials, measured relative to platinum. [8] The Seebeck coefficient of platinum itself is approximately −5 μV/K at room temperature, [9] and so the values listed below should be compensated accordingly. For example, the Seebeck coefficients of Cu, Ag ...
Toggle the table of contents. ... throughout the range of temperatures for which it is intended to work, (a) at a given fixed pressure, ... or a thermocouple or ...
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