Anhui Tiankang WRR WRP WRN WRE Industrial Prefabricated Thermocouple Product Introduction and Working Principle Anhui Tiankang WRR WRP WRN WRE Industrial Prefabricated Thermocouple Product Introduction and Working Principle: Industrial prefabricated thermocouples are used as temperature sensors and are usually used in conjunction with display instruments, recorders, and electronic regulators. It can directly measure the surface temperature of liquids, vapors, gases, and solids within the range of 0 ℃ to 1800 ℃ in various production processes. Main technical indicators: temperature measurement range and allowable error, thermocouple category code, division number, measurement range, ℃, allowable deviation △ t ℃, platinum rhodium 30- platinum rhodium 6WRRB 0~800 ± 1.5 ℃ or ± 0.25% │ t │, platinum rhodium 10- platinum WRPS 0~1600 ± 1.5 ℃ or ± 0.25% │ t │, nickel chromium nickel silicon WRNK 0~1300 ± 2.5 ℃ or ± 0.75% │ t │, nickel chromium copper nickel WREE 0~800 ± 2.5 ℃ or ± 0.75% │ t │ Note that "t" is the measured temperature thermal response time of the temperature sensing element. When there is a step change in temperature, the output of the thermocouple changes to 50% of this change, and the time required is called the thermal response time represented by T0.5. The nominal pressure of a thermocouple generally refers to the static external pressure that the protective tube can withstand at room temperature without breaking. In fact, the allowable working pressure is not only related to the material and diameter wall thickness of the protective tube, but also to its structural form, installation method, insertion depth, as well as the flow rate and type of the measured medium. The minimum insertion depth of a thermocouple should not be less than 8-10 times the outer diameter of its protective tube (except for special products). The test voltage for insulation resistance of thermocouples at room temperature is DC 500V ± 50V. The atmospheric conditions for measuring insulation resistance at room temperature are temperature of 15-35 ℃, relative humidity of 45%, and atmospheric pressure of 86-106kPa. a. For thermocouples with a length exceeding 1 meter, the product of their insulation resistance at room temperature and their length should not be less than 100. That is, Rr. L ≥ 100 M Ω. In the formula M L>1m, Rr - the insulation resistance at room temperature of the thermocouple should be M Ω b. For thermocouples with a length equal to or less than 1 meter, their insulation resistance at room temperature should not be less than 100 M Ω. The upper limit temperature insulation resistance of the thermocouple should not be less than the following expression: upper limit temperature tm ℃, test temperature t ℃, resistance value M Ω 100 ≤ tm＜300t=tm10300≤tm＜500t=tm2500≤tm＜850t=tm0.5850≤tm＜1000t=tm0.081000≤tm＜1300t=tm0.02tm＞1300t=13000.02