What kinds and application of the thermocouple is _ instrument

Commonly used in low temperature zone thermocouple is a kind of temperature detector. It is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. The main characteristic of thermocouple thermocouple is high accuracy, stable performance. The platinum thermocouple measuring accuracy is high. Thermocouple temperature measurement is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement. Thermocouples are mostly made of pure metal materials, the application is a lot of platinum and copper, in addition, now began to use the materials such as nickel, manganese and rhodium thermocouple. Ordinary thermocouples from the thermocouple temperature measurement principle, the measured the change in temperature is directly measured by thermocouple resistance change, therefore, the wires of a thermocouple body such as a variety of wire resistance change will affect temperature measurement. There are four types of thermocouple, have, flameproof thermocouple, thermocouple, end thermocouple, flame-proof thermocouple. Flameproof thermocouple junction box flameproof thermocouple with special structure, its shell internal explosive mixed gas by affected by sparks or electric arc explosion limit within the junction box, that wouldn't make production field explosion. Flameproof thermocouple can be used in the bla B3c level zone with explosion danger place temperature measurement. Thermocouple thermocouple is by the thermal components, wire, insulation materials, stainless steel casing combination solid body, its diameter is commonly phi - 2 Phi is 8 mm, achieve more xiaoke phi is 0. 25mm。 Compared with conventional type thermocouple, it has the following advantages: small volume, no internal air gap, thermal inertia, the measured value after small; (2) good mechanical properties, resistance to vibration and shock. (3) can bend, easy to install (4) long service life. Capillary thermocouple ends thermocouple temperature sensing element resistance wire winding by special processing, close to the face in the thermometer. Compared with general axial thermocouple, it can reflect more correctly and quickly end face of the actual temperature being measured, is suitable for measuring temperature bearing and other parts of the face. Thermocouples and digital display table, recording instrument, and usually used 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. Flame-proof thermocouple, flame-proof thermocouple through the special structure of the 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.