Introduction to ordinary industrial thermoresistors — PT100 thermoresistor

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This post was last edited by Black gold on 2012-4-13 at 14:26. The commonly used ordinary industrial-type thermistors (PT100 thermistors) include: 1. Platinum thermistors: Widely used for measuring temperatures in the range of (-200～850)°C. In a few cases, low temperatures can be measured down to 1 K, while high temperatures can be measured up to 1000°C. It has stable physical and chemical properties and good reproducibility, but it is expensive. There is an approximately linear relationship between the platinum resistance thermometer and temperature. Its calibration numbers are mainly Pt10 and Pt100. 　　2. Copper thermoresistors: Widely used to measure temperatures in the range of (-50～150)°C. Its advantages are that high-purity copper wire is easy to obtain, it is inexpensive and has good interchangeability, but it is prone to oxidation. The copper thermoresistor has a linear relationship with temperature. Its division numbers are mainly Cu50 and Cu100. 　　The armored thermoresistor is developed on the basis of the armored thermocouple; it is made by combining a thermoresistor, insulating material, and a metal sleeve. Its advantage lies in the fact that its physical dimensions can be kept very small (with a minimum diameter of 20 millimeters), which enables fast response times. It also boasts good mechanical properties, resistance to vibration and impact, good flexibility, and is less susceptible to corrosion by harmful substances. 　　Before using a thermistor, it is necessary to check its condition. A simple way to do this is to remove the thermistor from its protective tube and measure its resistance with a multimeter. If the multimeter reading is “0” or less than the R0 value, then the thermistor is short-circuited; it is necessary to locate the point of the short circuit and repair it ； If the multimeter reads “∞”, then the thermistor is open-circuited and cannot be used ； If the multimeter reading is slightly higher than the resistance value of R0, it indicates that the thermistor is functioning properly. 　　When the resistance value of a thermal resistor (PT100 thermal resistor) is incorrect, the resistance wire should be increased or decreased at the intersection at the lower end point, rather than being adjusted elsewhere. After complete adjustment, the resistance wires should be arranged neatly without any contact between them, and then wrapped up as before. 　　A repaired thermistor must pass calibration before it can be used. Other products: Rotating vortex flowmeter, metal tensile testing machine, Shanghai-type tensile machine, bending testing machine