Industrial thermocouple compensation wire _ model selection of the instrument

First thermocouple temperature of 1200 degrees, is a very big bear thermocouple temperature or need to measure the temperature of the thermocouple work end? Need two different part of thermocouple wire, one end of the weld is called work side, the other end is referred to as reference, using the work side with reference to the difference in temperature of thermoelectric potential for temperature measurement. And in the title only the conductor of a material is presented. Retains as nickel chrome - Nickel silicon ( Or nickel chrome - Nickel aluminum) Type thermocouple is analyzed: nickel chrome - Nickel silicon ( Or nickel chrome Nickel aluminum) Thermocouples used for a long time in 0 Inner temperature range of 900 degrees temperature and short term allowed used in the temperature of 1200 degrees. For compensating conductor selection should pay attention to the following: 1, the compensating conductor must be used with corresponding thermocouple ( The nickel chrome - Nickel aluminum type thermocouple should form a complete set of nickel and chromium - Nickel aluminum compensating conductor) 。 2, the positive, the positive and thermocouple compensation wire into the anode and the cathode, may not be wrong. 3, compensation conductor should be the same with the two point of thermocouple temperature, and shall not be more than 100 degrees. After 4, thermocouple connected to compensation conductor should be fixed reference junction. Thermocouple compensation wire is composed of conductor and insulation coating layer; Compensation conductor should be due to the core alloy material divided into extension type and compensation type two kinds, extended type compensation conductor is NX ( Nickel chromium silicon - Nickel silicon magnesium) KX ( Nickel chrome 10 - Nickel silicon 3) 交货( Nickel chrome 10 - Copper and nickel 45) ,JX ( Iron - Copper and nickel 45) TX ( Copper - Copper and nickel 45) Type of compensation, compensation conductor with SC and RC ( Copper - Copper and nickel 0. 6) KC ( Copper - Copper and nickel 40) 、NC（ Iron - Copper and nickel) Such as thermocouple compensation wire insulation layer and the coat material with PVC, ptfe, glass fiber, quartz and ceramic fiber yarn, etc. ; Metal shielding layer are stainless steel wire mesh, etc. Thermocouple compensation wire connected to the display instrument, recorder, or computer temperature measuring system, widely used in electric power, metallurgy, petroleum, chemical industry, textile and other industrial and national defense, scientific research departments and so on. Thermocouple temperature measurement is the basic principle of two kinds of different ingredients of closed loop conductor material composition, when when there is a temperature gradient at both ends, loop will have an electric current passes through, the existed between the electromotive force on both ends - Thermoelectric emf, this is the so-called seebeck effect ( Seebeckeffect) 。 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.