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Explain the difference between PT100 platinum resistance and K-type thermocouple

by:JVTIA     2022-01-13
What is PT100? (1) pt100 is a platinum thermal resistance, its resistance is proportional to the change of temperature. The relationship between the resistance value of PT100 and the temperature change is: when the temperature of PT100 is 0°C, its resistance value is 100 ohms, and its resistance value is about 138.5 ohms at 100°C. Its industrial principle: When PT100 is at 0 degrees Celsius, its resistance is 100 ohms, and its resistance will increase at a uniform rate as the temperature rises. (2) pt100 is a platinum thermal resistance is a very commonly used temperature detection instrument in the middle and low temperature areas. The thermal resistance temperature measurement is based on the characteristic that the resistance value of the metal conductor increases with the increase in temperature for temperature measurement. (3) Its main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistance is very high. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. The big difference between the choice of PT100 platinum resistance and K-type thermocouple is the choice of temperature range. Thermal resistance is a temperature sensor for measuring low temperature. Generally, the measurement temperature is -200~800℃, while K-type thermocouple is for measuring medium and high temperature. The sensor generally measures 400~1800℃. If the measurement temperature is around 200℃, thermal resistance measurement should be selected. If the measurement temperature is 600℃, it should be selected. If the measurement temperature is 1200~1600℃, S should be selected. Type or B type thermocouple. (1) Features of thermocouple ① High measurement accuracy. Because the thermocouple is in direct contact with the measured object, it is not affected by the intermediate medium. ②Wide measuring range. Commonly used thermocouples can measure continuously from -50 to +1600°C. Some special thermocouples can measure as low as -269°C (such as gold, iron, nickel and chromium), and can reach as high as +2800°C (such as tungsten-rhenium). ③Simple structure and convenient use. Thermocouples are usually composed of two different metal wires, and are not limited by size and beginning, and there is a protective sleeve outside, which is very convenient to use. 2. The type and structure of thermocouple ④It also has the advantages of good linearity, large thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price. It can be used in an oxidizing inert atmosphere. Widely used by users. (2) Types of thermocouples Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The called standard thermocouple refers to the thermocouple whose thermoelectric power and temperature are stipulated in the national standard, the allowable error, and there is a unified standard graduation table. It has a matching display instrument for selection. Non-standardized thermocouples are inferior to standardized thermocouples in the scope or order of magnitude, and there is generally no unified indexing table, which is mainly used for measurement in some special occasions. (3) The structural form In order to ensure the reliable and stable operation of the thermocouple, its structure requirements are as follows: ①The welding of the two thermoelectrodes composing the thermocouple must be firm; ②The two thermoelectrodes should be well insulated from each other , To prevent short circuit; ③The connection between the compensation wire and the free end of the thermocouple should be convenient and reliable; ④The protective sleeve should be able to ensure that the hot electrode is fully isolated from the harmful medium.
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