The working principle of miniature thermocouple quickly1

Fast miniature thermocouple, this is a used to measure the liquid steel, hot metal, or other molten metal temperature thermocouple, its structure as shown in the figure below. Because a thermocouple is only used once, therefore is also called the thermocouple. Due to the thermocouple all materials are cheap, even for precious metal thermocouple, but a platinum wire very fine platinum inscription, with the address is not big, in general the price is cheaper.

1, the outer protective cap; 2, u-shaped quartz tube; 3, the paper tube; 4, adiabatic cement; 5, thermocouple cold end

6, cotton; 7, insulating paper tube; 8, small paper tube; 9, compensation conductor; 10, plastic plug-in

metal protective cap protects the role of u-shaped quartz tube will not be damaged. U 005 - quartz tube wear diameter 01 mm long, 25 A pair of hot electrode (40 mm Usually a platinum germanium a platinum or double platinum germanium) , through the corresponding compensation wires to the contact point of the plastic on the plug-in, thermoelectric potential raises, the temperature inside the gun wire connected to fast electronic potentiometer ( Recording instrument) Or the digital display instrument.

temperature measurement, the operator through the thermocouple temperature measuring gun inserted in the molten steel, yun to rapidly melting metal protection, u-shaped quartz tube and hot electrode exposed to melt, the instantaneous were also destroyed. But now the thermoelectric potential produced by the molten steel temperature signal transmission to the rapid electronic potentiometer instruction, record the molten steel temperature.

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