The working principle of thermocouple _ instrument with the practical application3

Thermocouple is usually and display meter, recording meter and electronic regulator. It can be directly measured from various production process 200 ℃ to + 600 ℃ within the scope of the liquid, steam and gas medium and the temperature of the solid surface. WZ series thermocouple assembly: usually by the temperature sensing element, main parts, such as installing fixtures and connection box with high measuring accuracy, stable and reliable performance, etc. With Pt100 platinum thermocouple widely used in practical application. WZPK series platinum thermocouple, thermocouple is by the thermal components, wire, insulation materials, stainless steel casing combination solid body, it has the following advantages: slender shape, heat fast response time, vibration resistance, long service life, etc. Explosion-proof explosion-proof thermocouple: explosion-proof explosion-proof thermocouple, through the special structure of junction box, the box inner explosive mixed gas by affected by sparks or electric arc explosion limit within the junction box, production site won't explode. End thermocouple: end thermocouple temperature components made by special processing of the resistance wire, close to the face in the thermometer. Compared with general axial thermocouple, it can reflect more correctly and quickly measured end face of the actual temperature, suitable for measuring the surface temperature. Working principle of thermocouple temperature measurement principle is based on the conductor or the resistance changes over temperature of the semiconductor this feature to measure temperature and parameters related to the temperature. Thermocouple are mostly made of pure metal materials, the application is a lot of platinum and copper, now have begun to use the materials such as nickel, manganese and rhodium thermocouple. Thermocouple is usually need to get the resistance signal through wire transfer to the computer control device or other secondary instrument. Practical application is currently widely used thermocouple material platinum and copper, platinum resistance of high precision, suitable for neutral and oxidizing medium, good stability, has a certain nonlinear, the higher the temperature the smaller resistance change rate; Copper resistance in the temperature range of a linear relationship between internal resistance value and temperature, temperature line number is big, suitable for corrosive medium, more than 150 susceptible to oxidation. Commonly used with R0 = 10 Ω, R0 = 100 Ω and R0 = 1000 Ω to wait for a few kinds, their index number Pt10, Pt100, Pt1000 respectively; Copper resistance with R0 = 50 Ω and R0 = 100 Ω two kinds, their index number for Cu50 and Cu100. Pt100 and Cu50 widely used.