Working principle of thermocouple thermometer and pay attention to the point

Thermocouple thermometer belongs to contact temperature measuring instrument, is a passive output components. It is two kinds of active sex difference is very big in the metal conductor, fused into a contact is affected by temperature the integration of both ends have a galvanic effect! Can output a weak potential ( Electrical signal) ! And therefore is used in the high temperature measuring temperature sensing element, its volume is much larger than the thermistor sensor. S4F magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

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its working principle is made by the two different conductor loop, the loop will produce electric potential, the potential size is directly related to the difference in temperature between the two contact, this kind of phenomenon called the thermoelectric effect. Using thermal element is the thermocouple made of thermoelectric effect, using thermocouple as the temperature sensing element of thermometer is a thermocouple thermometer. Thermoelectric potential by the temperature difference of electric potential and contact potential. Electric potential difference in temperature is caused by the inhomogeneous temperature difference on both ends of the conductors. Contact potential is when contact with the two different conductor A and B, because of the free electron density, electron diffusion at contact, the formation of the electric potential. Contact potential is not only a function of temperature t, its contribution to the thermoelectric potential also far bigger than the thermoelectric potential. Measure the thermoelectric potential thermocouple for temperature changes, according to the function relation between thermoelectric potential and temperature change can know cause temperature of thermoelectric potential. Because of its irreplaceable advantages into industrial and mining enterprises and scientific research institutes of commonly used temperature measuring instrument. The correct installation of thermocouple sensor is to guarantee the accuracy of measurement and the service life of the important factors. S4F magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

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when actual use paying special attention to the use of the compensating conductor. Usually by compensating lead wires between the instrument and junction box, the thermoelectric properties and the thermocouple used the same or similar, and the thermocouple connection not attached to the heating potential, will not affect the total thermoelectric potential thermocouple loop. If using ordinary wire instead of compensation wire, is less than the compensation effect, thus reduce the accuracy of temperature measurement. So, should be paid attention to when using the unit instrument wiring installation: compensation conductor should be connected to the thermocouple, the polarity do not against, otherwise the temperature measurement error increases. S4F magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

in practical measurement, if the value of measurement are usually deviated from the actual value is too much, in addition to the thermocouple improper installation position, it is also possible that thermocouple occasionally silk by oxidation, thermocouple measuring the solder joint sand holes, etc. S4F magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

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recommended reading: b type thermocouple in the chamber of a stove or furnace temperature measuring index in the analysis of the causes of beating s4F magnetic flap | | glass thermometer thermometer floating ball thermometer | | double color glass thermometer thermometer