Thermocouple temperature sensor calibration

With the development of the temperature measurement technology, the temperature of the thermocouple sensor calibration also experienced a gradual development, constantly modify and improve the gradual process. From the scale, the experiences of early development for later ideal thermodynamic temperature scale and absolute gas temperature scale. To the international practical use today has a high precision temperature scale, which has experienced hundreds of years.

calibration method of thermocouple temperature sensor can be divided into two categories:

is a thermocouple temperature sensor at the same time, the standard comparison, which are measured in accordance with the international commission in 1968 through the international practical temperature scale ( 进行) In comparison,

2 is a thermocouple temperature sensor and a calibration temperature measurement standard device is used in the comparison.

another calibration method is more general and commonly used in the calibration temperature thermocouple sensor and a higher level has been good calibration accuracy of the thermocouple temperature sensor, close together, jointly put in adjustable thermostat, adjust the tank temperature respectively to the selected number of temperature points, compare and record the readings, obtain a series of corresponding difference, after repeated heating, cooling, repeated testing, stable, if the difference is the record of these difference as the calibration of the thermocouple sensor correction, is to be temperature thermocouple temperature sensor calibration.

benchmark method is to use a thermocouple temperature sensor with reference materials in the sealed container, will stay calibration of thermocouple temperature sensor is sensitive to the elements in one container in the center position of the casing; Then heating, make the temperature more than the melting point of reference materials, for all material melt; Subsequent cooling temperature thermocouple sensor, reach the freezing point, as long as there is liquid and solid at the same time ( About a few minutes) , temperature is stable, and can keep the prescribed values.

to define fixed point between temperature, in 259. 34-630. Between 74 ℃, using benchmark as standard platinum resistance thermometer. Benchmark platinum resistance temperature thermocouple sensor is made of uniform, diameter of 0. 05 ~ 0. 5 mm, completely annealing and no strain of platinum wire. Thermocouple temperature sensor platinum resistance than W baidu ( 100). =RlooR。 = 1. 39250, of which the Ro, Rloo respectively 0 ℃ and 100 ℃ when the resistance value. 630. 74 a, 1064. 43 ℃ between, USES the standard is the platinum germanium, a platinum standard thermocouples. 1064. 43 ℃ above, using optical pyrometer as standard. Standard of thermocouple temperature sensor in different temperature range points according to the definition of different interpolation formula between temperature. Specific method can refer to the '1968 international practical scale and temperature calculation method'

the world according to the regulations of the thermocouple temperature sensor calibration set up their own national standards, and regularly and international standards, in order to ensure its accuracy and reliability. Our country standard temperature preservation in China metrology academy of sciences. The provincial cities and counties in the temperature of the measuring department standard at a lower level compared with standard at the next higher level on a regular basis, calibration, accordingly to the standard temperature of transmission, so as to guarantee the accuracy of the temperature standard and unity.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor