Armored thermocouple

Prefabricated thermocouple WRNB-230 Prefabricated thermocouple WRNB-230As a temperature sensor, Tiankang Instrument is usually used in conjunction with display instruments, recording instruments, 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.Prefabricated thermocouple WRNB-230（The working principle of Tiankang Instrument is that two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the measuring end, and the wiring terminal end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple. The thermoelectric potential of a thermocouple will increase as the temperature at the measuring end rises. The magnitude of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectric electrode. Prefabricated thermocouples are mainly composed of a junction box, protective tube, insulating sleeve, terminal block, and thermoelectric electrode, and are equipped with various installation and fixing devices. 【 Main Technical Indicators 】 Measurement Range and Basic Error Thermocouple Category Code Scale Number Measurement Range Basic Error Limit Nickel chromium constantan WRK E 0-800 ℃± 0.75% t Nickel chromium nickel silicon WRN K 0-1300 ℃± 0.75% t Platinum rhodium 13 Platinum WRB R 0-1600 ℃± 0.25% t Platinum rhodium 10 Platinum WRP S 0-1600 ℃± 0.25% t Platinum rhodium 30 Platinum rhodium 6 WRR B 0-1800 ℃± 0.25% t Note: t is the measured temperature value of the temperature sensing element (℃). When there is a step change in temperature, the output of the thermocouple changes to 50% of that 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. It should not be less than 8-10 times the outer diameter of the assembled thermocouple protection 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【 Model Selection of Prefabricated Thermocouple] WR Thermocouple Specification Code Thermoelectric Pole Type R Platinum Rhodium 30- Platinum Rhodium 6P Platinum Rhodium 10- Platinum N Nickel Silicon Nickel Silicon M Nickel Chromium Silicon Nickel Silicon E Nickel Chromium Copper Nickel C Copper Nickel F Iron Copper Nickel Code Output Signal Number None 2 Single and Double Code Fixed Device Form 1234567 Non fixed Installation Fixed Thread Active Flange Fixed Flange Active Flange Angle Gauge Type Fixed Thread Conical Tube Straight Tube Joint Code Junction Box Form 234 Splash proof Waterproof Explosion proof Code Protection Tube Diameter 0 Φ 16mm Protection Tube 1 Φ 25mm Protection Tube 2 Φ 16mm High Aluminum Protection Tube 3 Φ 20mm High Aluminum Protection Tube