The temperature sensor calibration

With the development of the temperature measurement technology, the temperature sensor calibration also experienced a gradual development, and improve the gradual process of constant revision. 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 the temperature sensor can be divided into two categories,

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

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

is more general and commonly used another kind of calibration method is put by temperature sensor and has been calibration good higher precision of the 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 correction as calibration of sensor, has been on the temperature of the temperature sensor calibration.

temperature sensor datum method is to use a sealed container with reference material, put for calibration of the temperature sensor sensitive element 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; After the temperature sensor cooling, then 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, the temperature between between 25934 ~ 63074 ℃, using benchmark as standard platinum resistance thermometer. Benchmark platinum resistance temperature sensor is made of uniform, the 005-05 mm diameter, completely annealing and no strain of platinum wire. The temperature sensor platinum resistance than W baidu ( 100). =RlooR。 = 139250, of which the Ro, Rloo 0 ℃ and 100 ℃ respectively when the resistance value. Between 63074 - a - 106443 ℃, using standard platinum germanium, a platinum standard thermocouples. 1064 43 ℃ above, using optical pyrometer as standard. The standard temperature sensor in different temperature range points according to the definition of different interpolation formula between the temperature. Specific method can refer to the '1968 international practical scale and temperature calculation method'

the world according to the temperature sensor calibration regulations 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 sensor and digital temperature sensor