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Miniature thermocouple overview
miniature thermocouple with armoured thermocouple, thermocouple and assembly as thermocouple sensor of measuring temperature, usually miniature thermocouple and display instrument, recorder and electronic regulator, at the same time, the miniature thermocouple also can be used as a prefabricated thermocouple temperature sensing element. Armoured miniature thermocouple can be directly measured in the production of a variety of 0 ℃ ~ 600 ℃ in the scope of liquid, steam and gas medium, as well as the temperature of the solid surface. Miniature thermocouple is particularly suited to narrow and curved areas temperature measurement and control. Is the chemical industry, chemical fiber, pharmacy, etc the indispensable measure temperature device.
miniature thermocouple temperature measurement principle
will be two different welding material A conductor or semi-conductor A and B, form A closed loop. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, thus forming the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermocouple is in using this effect to work.
the micro thermocouple technique parameter
degree level: level I or II [ Below 375 ° plus or minus 1. 5 degrees as the primary standard. Plus or minus 2. 5 degrees as the secondary standard 】
nominal diameter: Φ 1 Φ 0. 5Φ0。 35' General minimum diameter 】
miniature thermocouple temperature compensation
as a result of the thermocouple materials are generally more expensive ( Especially when using precious metals) And temperature measuring points are far away the distance to the instrument, in order to save thermocouple materials, reduce cost, usually adopt the compensating conductor (of the cold junction of the thermocouple The free end) Reaches to the relatively stable control indoor temperature and connected to the meter terminals. It must be pointed out that the role of the thermocouple compensation wire only extend thermal electrode, make moves to the control room of the cold junction of the thermocouple meter terminal, it itself does not eliminate the cold end temperature change on the influence of temperature, no compensation. So, still need other correction method is used to compensate the cold end temperature t0 indicates influence on measuring temperature 0 ℃. Must pay attention to when using thermocouple compensating conductor model match, cannot be wrong polarity, compensation conductor should be connected to the thermocouple temperature should not exceed 100 ℃.
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