Introduction to the principle of high temperature and high pressure thermocouple

High temperature and high pressure thermocouples have high temperature corrosion resistance and are usually used for general heat-resistant steel. Low carbon content, with good intergranular corrosion resistance, usually used as a general heat-resistant steel. Low carbon content and good intergranular resistance are commonly used as heat-resistant steels. Ultra low carbon content, with good intergranular corrosion resistance, usually used as heat-resistant steel. Nickel based high-temperature alloy steel is commonly used as a heat-resistant steel due to its high temperature oxidation resistance and corrosion resistance.

Thermal resistance error of high temperature and high pressure thermocouples. At high temperatures, if there is a layer of coal ash and dust attached to the protective tube, the thermal resistance increases, hindering the conduction of heat. At this time, the temperature reading is lower than the true value of the measured temperature. Therefore, the exterior of the high-temperature and high-pressure thermocouple protection tube should be kept clean to reduce errors. The error introduced by insulation deterioration. If the high temperature and high voltage thermocouple is insulated, excessive dirt or salt residue on the protective tube and wire plate can cause poor insulation between the high temperature and high voltage thermoelectric dipoles and the furnace wall, which is even more severe at high temperatures. This not only causes loss of thermoelectric potential but also introduces interference, resulting in errors that can sometimes reach up to 100 degrees.

High temperature and high pressure thermocouple application, specially designed for power stations, can meet the temperature measurement needs of 300000, 600000 kW and other generator sets and auxiliary equipment. Directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of -200 ° C to 800 ° C in various production processes. Working principle: The electrodes of a thermocouple are composed of two different conductor materials. When there is a temperature difference between the measuring end and the reference end, a thermoelectric potential is generated, and the working instrument displays the temperature value corresponding to the thermoelectric potential. Thermistor measures temperature by utilizing the characteristic that the resistance of a substance changes with temperature. When the resistance value changes, the working instrument displays the temperature value corresponding to the resistance value.