Nickel chrome - Basic principle and characteristics of copper and nickel E type thermocouple _ instrument

Nickel chrome - Copper and nickel E type thermocouple principle of thermocouple is a temperature sensing element, it converts the signal temperature thermoelectric emf signal, through electric instrument converts the temperature of the measured medium. Nickel chrome - Copper and nickel E type thermocouple temperature measurement is the basic principle of two kinds of different ingredients of homogeneous conductor closed loop, when temperature gradient is at both ends, the loop will have an electric current passes through, the existed Seebeck electromotive force between two 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. According to the thermoelectric emf as a function of temperature, the thermocouple indexing table; Indexing table is free end temperature at 0 ℃, under the condition of different thermocouples with different indexing table. Access in the thermocouple loop when the third metal material, the two contacts at the same temperature as long as the material, produced by the thermocouple thermoelectric is set to remain the same, which is not affected by the third metal access in the loop. Therefore, when the thermocouple temperature measurement, can be connected to the measuring instrument, measured after the thermoelectric emfs, can know the temperature of the measured medium. Thermocouple advantages: (1) high accuracy of measurement: thermocouple, direct contact with the object under test is not influenced by intermediate medium. (2) thermal response time fast: thermocouple is responsive to temperature changes. (3) large measuring range: thermocouple from - 40 ~ + 1600 ℃ can be continuous temperature measurement. (4) reliable performance, good mechanical strength. (5) long life convenient installation. ( 1) Thermocouple type thermocouple is K type nickel chrome - Nickel silicon WRN series, N type nickel chromium silicon - Nickel silicon magnesium WRM series, E nickel chrome - Copper and nickel WRE series, iron - J type Copper and nickel WRF series, copper - model T Copper and nickel WRC series, S platinum rhodium - 10 Platinum WRP series, R ( Platinum rhodium - 13 Platinum WRQ series, B type platinum rhodium - 30 Platinum rhodium 6 WRR series and so on. ( 2) Nickel chrome - The structure of copper and nickel E type thermocouple thermoelectric heat is the basic structure of electrode, insulation and protection tube; And display instrument, recorder & # 39; > record instrument or computer systems. According to the environment in the field use, developed into a variety of factors such as measured medium is suitable for all kinds of thermocouple.