As a temperature measurement sensor, armored thermocouples are usually used together with temperature transmitters, regulators, and display instruments to form process control systems for direct measurement or control of fluids in the 0-1800°C range of various production processes. Steam and gas media and solid surfaces and other temperatures. Armored thermocouples offer many advantages such as bendability, high pressure resistance, fast thermal response time, and robustness. Like industrial assembly thermocouples, they are used as temperature-measuring sensors and are usually associated with display instruments, recording meters, and electronic regulators. use.
Insert the thermocouple into the furnace horizontally. Its specifications and experimental conditions are as follows: Diameter ф 4.8mm, length 25m, heating zone in the middle is 20m, temperature is 1000°C. In this experiment, the temperature difference between the measurement end and the middle part of the thermocouple was 200°C. If the measuring point temperature is higher than the middle part, a negative error occurs; conversely, a positive error occurs. If the temperature difference between the two is 200°C, then the shunt error is about 100°C. This must not be ignored. The conditions for producing shunt errors are related to factors such as the type and diameter of the armored thermocouple.
The so-called shunt error is measured when the furnace temperature is measured with an armored thermocouple. When the thermocouple has a temperature distribution exceeding 800°C in the middle of the thermocouple, the insulation resistance is decreased, and the thermocouple shows an abnormal phenomenon, which is called a shunt error. According to the homogenization loop rule, measuring the temperature with a thermocouple is only related to the temperature at both ends of the measuring end and the reference end, and has nothing to do with the temperature distribution in the middle. However, since the insulating material of the armored thermocouple is powdered MgO, the insulation resistance drops by an order of magnitude for every 100°C increase in temperature. When the temperature in the middle region is high, there must be a leakage current, resulting in the thermocouple output potential. There is a shunt error.
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