What does the main parameter of the NTC temperature sensor mean?Automatic machine mirror company

　　The B value is commonly used in the temperature sensor and is an important parameter: refers to the material constant (thermal index) of the NTC temperature sensor (thermal index), which can be measured by measuring the resistance value of the NTC temperature sensor at 25 ° C and 50 ° C (or 85 ° C). Calculated. The B value is directly proportional to the resistance temperature coefficient, which means that the larger the B value, the larger the resistance temperature coefficient. However, it cannot be simply said that the B value is large or small. When the temperature is measured, the B value is large when measured at low temperature and room temperature, and the sensitivity is low when measuring high temperature. At this time, you must choose the appropriate B value according to the component characteristics of the need for compensation; when the use of the surge is used, the larger the B value, the smaller the residual resistance value of the thermistor after heating through the current, which can reduce the thermistor resistance can reduce the thermal resistance resistance. Power consumption. The B value is defined as the difference between the difference between the number of natural pairs of the zero -power resistance value at two temperature and the difference between the two temperature counts. RB: Zero -power resistance value at temperature TB (K); TA, TB: Two specified temperature (K), k = 273.15+℃ Note: 1. B value is not a strict constant within the working temperature range. Essence 2. According to the differences in the two temperature points, the commonly used B value calculation the temperature point is 25 ° C and 50 ° C, 25 ° C and 85 ° C, 25 ° C and 100 ° C, 0 ° C and 100 ° C, etc.

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