Thermistor is a kind of sensitive element, which is divided into a positive temperature coefficient thermistor and a negative temperature coefficient thermistor according to different temperature coefficients. The thermistor type is characterized by the sensitivity of the use of temperature, showing different resistance values ​​at different temperatures. Thermistors are used for overheat protection, solid state relays, temperature control, amplification circuit gains, motor starters, fire alarms, and temperature compensation for electrical appliances.
Thermal resistance temperature measurement system is usually composed of thermal resistance, complete closed loop and display instruments. We should pay attention to the following points: 1. The index number of the thermal resistance and display instrument is usually the same. 2. In order to cancel the influence of the resistance change of the connection cable conductor, a three-wire connection method must be adopted. As the name implies, the resistance of a resistor changes with the change of heat. For example, for Cu50 and Cu100, the temperature range of platinum resistance is generally below 200-800 degrees Celsius, and the thermistor resistance is minus 40 to 140 degrees Celsius. .
Such as platinum platinum thermal resistance, the division known as Pt100. That is, its resistance is 100Ω at 0°C, 18.52Ω at -200°C, 175.86Ω at 200°C, and 375.70Ω at 800°C. For example, using a hot-rolled copper rod as the thermal resistance, indexing number Cu50. Its resistance is 50Ω at 0°C and 71.400Ω at 100°C.
The thermal resistance formula is generally Rt=Ro(1+A*t+B*t*t); Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t In the method of ], t represents the temperature °C, Ro is the resistance value at 0 °C, A, B, and C are all specified coefficients, and Pt100 and Ro=100. Index No. Definition: Represents the temperature field, and indicates how many temperature or specific voltages of the temperature measuring instrument or thermal resistance of each indexing number output the voltage of V or MV.
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