The difference between B25/50 and B25/85 in NTC resistors.NTC temperature Thermistor

　　NTC thermal resistance is a semiconductor ceramic component made of transition metal oxides as the main raw material. It has a very large negative temperature coefficient. The resistance value changes with the heating of the ambient or due to the current temperature or it produces self -heating. That is, at a certain measurement power, the resistance value drops rapidly as the temperature rises. Using this feature, the NTC thermistor can be determined by measuring its resistance to determine the corresponding temperature to achieve the purpose of detecting and controlling the temperature.

　　If you want to know the differences between B25/50 and B25/85, you must first talk about some conventional parameters of NTC thermal resistance.

　　Zero -power resistance value RT

　　At the prescribed temperature, the resistance value measured by the measured power that causes the resistance to the resistance compared to the total measurement error can be used.

　　Zero -power resistance R25

　　Refers to the zero -power resistance value measured at 25 ° C. Unless specifically pointed out, it is a design resistance value of thermistor and nominal resistance.

　　RT1: Zero -power resistance value at temperature T1 (K).

　　RT2: Zero -power resistance value at temperature T2 (K).

　　T1, T2: Two specified temperature (K).

　　T1 is generally taken at 25 ° C. When T2 is 50 ° C, it is B25/50. When T2 is 85 ° C, it is B25/85

　　The B25/50 is the B value calculated by the resistance value of 25 ° C and the resistance value of 50 ° C. B25/85 is the B value calculated by the resistance value of 25 ° C and the resistance value of 85 ° C.

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