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Thermocouple

How do you convert J-type thermocouple voltage to temperature using NIST polynomials? Question:How do you convert J-type thermocouple voltage to temperature using NIST polynomials?Answer:The NIST polynomials will produce the most accurate possible temperatureconversion, typically less than 0.05 degrees C error.NIST (National Institute of Standards and Technology) has published tables andequations that describe the voltage/temperature relationship. See PB93-190338,Temperature-Electromotive Force Reference Functions and Tables for theLetter-Designated Thermocouple Types Based on the ITS-90. NIST providestwo forms ofpolynomials. The first provides voltage as a function of temperature, andthe second provides temperature as a function of voltage. Both of these formswill be used in the procedure described here for doing a thermocoupletemperature conversion.The NIST tables and equations are all based on one end of the thermocouple(reference junction end) being at a temperature of 0 degrees Celsius. It ispossible to avoid having a 0 degree reference junction.

Formula

Voltage that the thermocouple type undergoing testing generates, this voltage can be renamed VTC. Therefore, formula (2) is rewritten as follows: Therefore, by measuring VMEAS and Tref, and knowing the voltage-to-temperature relationship of the thermocouple, you can determine the temperature of the thermocouple. Constantan Copper Iron J1 T=TTC. Type K Thermocouples - coefficients, a0, a1, a2, and ci, of reference equations giving the. Voltage, E, as a function of temperature, t90, for the indicated temperature ranges. The equation below 0 °C is of the form:.

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If the temperature ofthe reference junction is accurately known, then by using both the forward andinverse NIST polynomials the temperature of the thermocouple can be computed.On a thermocouple, voltage is produced across the thermocouple leads that isproportional to the difference in temperature from one end of the thermocouplewire to the other. It is important to understand that voltage does not developat the thermocouple junction but instead the voltage develops in the wire wereever a temperature gradient exists in the wire pair. Thermocouple:- - - V Vref Vmeas O.