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The Principle Of Temperature Measurement On Pt100 Thermal Resistance
Apr 04, 2018

Pt100 is platinum thermal resistance, its resistance is proportional to the temperature change. The relationship between the resistance of Pt100 and the temperature change is: When the temperature of Pt100 is 0°C, its resistance is 100 ohms, and its resistance is about 138.5 ohms at 100°C. Its industrial principle: When the PT100 is at 0 degrees Celsius, its resistance is 100 ohms, and its resistance will increase as the temperature rises. The resistance value and temperature of the metal thermal resistance can usually be expressed by the following approximate relationship: Rt=Rt0 [1+α(t-t0)] where Rt is the resistance at temperature t; Rt0 is the temperature t0 (usually The corresponding resistance value is t0 = 0°C); α is the temperature coefficient. The relationship between the resistance and the temperature of the semiconductor thermistor is Rt=AeB/t where Rt is the resistance at temperature t; A and B depend on the constant of the construction of the semiconductor data. In comparison, the temperature coefficient of the thermistor is larger, and the resistance at room temperature is higher (usually over thousands of ohms), but the interchangeability is poor and the nonlinearity is severe. The temperature measurement scale is -50~300°C. At the mercy, many are used for temperature checks and controls in home appliances and cars. Metal thermal resistance is usually applied to the temperature measurement within the range of -200~500°C. It is characterized by accurate measurement, good stability, and reliable function. It is extremely widely used in process control. Commonly used metal thermal resistance in the industry from the resistance change with the temperature point of view, most metal conductors have this property, but not all can be used as thermal resistance temperature measurement, as the metal material of the thermal resistance is usually requested: as large and stable as possible The temperature coefficient and resistivity are large (reducing the sensor scale at the same sensitivity), the stable chemical physics function within the applied temperature scale, the imitation of the data is good, and the resistance value has a function of the interrelation as the temperature changes. (It is best to have a linear relationship). The resistance value of the conductor changes with changes in temperature. After measuring the resistance, the temperature of the measured object is calculated. Using this principle, the temperature sensor is a resistance temperature sensor. This sensor is mainly used for -200-500°C temperature scale. Temperature measurement inside. Pure metal is the primary manufacturing material of thermal resistance. The data of thermal resistance should have the following characteristics: 1 The temperature coefficient of resistance should be large and stable, and there should be an excellent linear relationship between the resistance value and temperature. 2 high resistivity, small heat capacity, fast response. 3 The data is reproducible and technically good, and the quote is low. Thermistor temperature characteristics 4 The chemical and physical properties are stable within the scope of temperature measurement. Nowadays, the most widely used platinum and copper in the industry, and has been made into a standard temperature resistance thermal resistance

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