triconex 3700A Thermocouple Analog Input Module

thermocouple is a temperature measuring element commonly used in temperature measuring instruments, which directly measures the temperature, and converts the temperature signal into the thermoelectric motive force signal, and converts the temperature of the measured medium through the electrical instrument (secondary instrument). A thermocouple consists of two conductors or semiconductors A and B of different materials welded together to form a closed loop. When there is A temperature difference between the two contacts of conductors A and B, an electromotive force is generated between the two, thus forming a current of a magnitude in the loop. This phenomenon is called the thermoelectric effect, and this electromotive force is called the thermoelectric potential. Thermocouples work by exploiting this effect.

Thermocouples have the characteristics of high measurement accuracy, large measurement range (-200℃ ~ 1300℃, special cases -270℃ ~ 2800℃), and fast thermal response time. Its basic structure is roughly the same, usually composed of thermal electrode, insulating sleeve protection tube and junction box and other main parts, usually and display instrument, recording instrument and electronic regulator supporting use. Because the thermocouple is an active sensor, the measurement does not need an external power supply, the use is very convenient, so it is often used to measure the temperature of the gas or liquid in the furnace, the pipeline and the surface temperature of the solid.

Thermocouples are widely used in power metallurgy, petrochemical, food processing, water treatment and other industrial fields, mostly for the continuous measurement of liquid, gas or steam and other media such as closed pressure vessels or open atmospheric pressure vessels.