In many occasions, on-site flow temperature measurement is required according to process requirements. 是按上述工艺要求设计的产品，专供测量各种形状的固体介质表面温度，以及测量液体、气体和橡胶内部的温度。 Surface thermocouples are products designed according to the above-mentioned process requirements. They are designed to measure the surface temperature of solid media of various shapes, as well as the temperature of liquids, gases, and rubber. It is matched with the pocket digital display and is widely used in industrial sectors such as textile, printing and dyeing, papermaking, plastic and rubber. Surface thermocouples have different shapes of probes, which can be selected according to the different shapes and needs of the measured object. Therefore, the range of use is very wide, especially suitable for processing sites.
的漏电防护知识：精密仪器在使用的过程中，不可避免的会出现各式各样的问题，在尽可能的防止中，还应该要及时的解决问题，以此保证仪器的正常运行，表面热电偶的使用上，无可避免的出现漏电现象，我们就应该做好足够的防护措施。 Knowledge of leakage protection on surface thermocouples : In the process of using precision instruments, various problems will inevitably occur. In order to prevent as much as possible, the problems should be solved in time to ensure the normal operation of the instrument. In the use of surface thermocouples, unavoidable leakage occurs, and we should take adequate protective measures. Causes of leakage on the surface thermocouple (1) The refractory bricks on the electric furnace are poorly insulated at high temperatures. Inserting a surface thermocouple with a metal tube on the furnace wall equipped with the furnace wire makes it easy for the furnace wire to contact the surface thermocouple. It is a good insulation material at room temperature, but as the temperature rises, the insulation performance will decrease significantly. Most of the furnace linings of electric resistance furnaces are made of alumina refractory bricks, and their resistance value decreases significantly with increasing temperature. (2) The contact between the furnace wire and the surface thermocouple. The platinum-rhodium surface thermocouple protection tube is an alumina ceramic tube. The couple wire is worn with a ceramic tube for separation and insulation. The insulation performance should also be reduced at high temperatures, causing leakage and finally leakage. Go to the surface thermocouple so that there is an AC leakage signal on the surface thermocouple. Methods to prevent leakage on surface thermocouples (1) Keep surface thermocouples out of contact with refractory bricks. (2) Ground the negative electrode of the surface thermocouple to eliminate the leakage signal on the surface thermocouple. (3) Install a filtering device at the output end of the surface thermocouple. (4) Lead the ground wire from the thermal contact of the surface thermocouple to ground. (5) Add a heat-resistant steel tube or silicon carbide tube to the surface thermocouple tube and ground it. By adopting the above methods, the instrument can work normally under severe conditions, which ensures that the instrument can accurately refer to temperature, control temperature, record, and make various instruments play their due roles.
公式都是Rt=Ro(1+A*t+B*t*t);Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t] 的形式，t表示摄氏温度，Ro是零摄氏度时的电阻值，A、B、C都是规定的系数，对于Pt100,Ro就等于100。 The surface thermocouple formulas are Rt = Ro (1 + A * t + B * t * t); Rt = Ro (1 + A * t + B * t * t + C (t-100) * t * t * t], t is the Celsius temperature, Ro is the resistance value at zero degrees Celsius, A, B, and C are the specified coefficients. For Pt100, Ro equals 100. With the rapid development of chemical, petroleum, metallurgy, machinery, scientific research, military industry and other departments, high-precision and high-sensitivity instruments are widely used, and the problem of anti-interference of instruments has become an indispensable research topic, especially industrial electric furnaces and silicon carbon rod electric furnaces , Salt bath furnace, etc., the interference caused by the instrument is not normal, the error increases, the instability, the instruction speed slows down and so on. Must be resolved, otherwise the quality of the product cannot be guaranteed, causing losses.