From the structure of the thermocouple to understand the working principle of thermocouple

The following introduce everyone from the structure of the thermocouple to understand the working principle of thermocouple?

want to understand the working principle of thermocouple must first understand its structure, the normal work of the each instrument is the result of joint efforts by a number of small components. Actually, thermocouple like an assembly line, the internal parts, in an orderly way of doing his work. Unity is strength, this sentence is also true for instrument.

thermocouple is composed of two different ingredients of conductor on both ends of the welding, forming circuit, direct measure WenDuan call side, the measurement terminal called reference. When when there is a difference in temperature measuring end and reference end will produce thermal current in the circuit, connected to display instrument, the instrument will indicate the thermocouple thermoelectric emf generated by the corresponding temperature value. Armoured thermocouple thermoelectric emfs growth over the course of measuring the temperature, the size of the thermoelectric emfs and only armoured thermocouple temperature difference on both ends of the conductor material, and, and the length of the hot electrode diameter has nothing to do.

armoured thermocouple in the thermocouple series has the highest accuracy, stability, best to measure your area wide, long service life, etc. Its physical and chemical performance is good, the armored thermoelectric potential stability and oxidation resistance at high temperature performance is good, suitable for oxidizing and inert atmosphere. Due to the thermocouple has excellent comprehensive performance, in line with the international use of armoured thermocouple temperature scale, has for a long time as an international scale interpolation instruments, although regulations will not be as international temperature scale inside the instrument. Thermocouple deficiency is thermoelectric potential, thermoelectric potential rate is small, low sensitive to read, mechanical strength under high temperature to drop, is sensitive to pollution, precious metal materials is expensive, and one-time investment is larger.

the virtues of thermocouple determines its extensive use, it can also be used to do alarm system, since it is thermal element, can feel the change of temperature, can be used in the scene of the fire prevention alarm system.