Explosion-proof thermocouple is good or bad about it1

Explosion-proof thermocouple is one of the many thermocouple type, can be used in flammable, explosive and other dangerous situations. When we were in the use of explosion-proof thermocouple for explosion-proof discrimination method of thermocouple or know? Engineering today is to introduce specific explosion-proof thermocouple for you good or bad about it, hope you can help to you.

explosion-proof thermocouple temperature measurement is the basic principle of two kinds of different ingredients of closed loop conductor material composition, when temperature gradient is at both ends, the loop will have an electric current passes through, the existed between the electromotive force on both ends - — Thermoelectric emf, this is the so-called seebeck effect. Two different components of homogeneous conductor electrode as heat, the temperature is higher for work at the end of the end, one end of the low temperature as the free end, usually free end under a constant temperature.

explosion-proof thermocouple in use after a period of time, there will be wear and tear, and may even damage, the stand or fall of explosion-proof thermocouple and explosion-proof thermocouple wire in it ( Silk) , but how to judge the stand or fall of I line, will discuss this problem simple.

first determine the appearance of the thermocouple wire is no problem, it is good or bad, have to go through testing to determine.

the thermocouple wire wear under test thermocouple special porcelain sleeve, and the standard platinum rhodium explosion-proof thermocouple in the tube furnace together, will be one of the hot side insert tube furnace porous soaking with metal in the cylinder made of nickel. Put their compensation the cold end of the wire in the ice water to keep zero degrees Celsius in the container.

keep tubular electric furnace in the allowable maximum temperature of thermocouple, and keep the stable range. This time use after testing qualified, hui sten potentiometer, measure standard thermocouple and under test thermocouple thermoelectric potential difference and record.

according to the records of the thermoelectric potential difference, check grade table find out their corresponding temperature, if the explosion-proof thermocouple out-of-tolerance, under test can be judged to be unqualified.

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