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                                                  Summary of NTC Thermistor and Temperature Sensor

                                                  Published time:2011/6/28    Visitors:5861次

                                                    Thermistor is a ceramic semiconducting element made from exorbitant oxides material. It has the feature that the resistance changes according to the ambient temperature. Namely, their resistance declines with the rising of ambient temperature at a determinated measuring power. With this feature NTC thermistor and temperature sensor can be applied in the situation of temperature compensation, measurement and control and surge current protection.

                                                    Main Techno-Parameter of NTC Thermistor

                                                    1.Zero Power Resistance RT
                                                    At rated temperature, it is the resistance measured by the measuring power which causes the resistance change that can be ignored relative to the whole measuring error.

                                                    2.Rated Zero Power ResistanceR25
                                                    The rated resistance of thermistor which is the zero power resistance measured at 25℃ and signed on the thermistor.

                                                    3.B Value
                                                    B value is the thermal exponent of negative temperature coefficient thermistor, which is defined as the ratio of the difference between the napierian logarithms of zero power resistance at two temperatures to the difference between the two temperatures’ reciproal.

                                                    In the equation:
                                                    RT1- the zero power resistance at T1
                                                    RT2- the zero power resistance at T2

                                                    Unless the particular indication, B value is figured out from the zero power resistances at 25℃(298.15K) and 50℃(323.15K) and B value is not a rigorous constant in the range of operating temperature.

                                                    4.Temperature Coefficient of Zero Power ResistanceαT
                                                  At rated temperature, it is the ratio of the zero power resistance change rate with temperature to the zero power resistance itself. Namely:

                                                    where:
                                                    αT-the temperature coefficient of zero power resistance at T
                                                    RT-the zero power resistance at T
                                                    T-temperature
                                                    B- B value

                                                    5.Dissipation Coefficientδ
                                                    At rated ambient temperature, it is the ratio of consumption power change rate of thermistor to the change of the corresponding temperature, namely:

                                                    In the range of operating temperature, δ has a little change with the ambient.

                                                    6.Thermal Time Constantτ
                                                    At zero power, it is measured as time in seconds which needed for thermistor temperature change of 63.2% difference between initial and final thermistor temperature when the temperature breaks.
                                                    τis in direct ratio to thermal capacity C of thermistor and in inverse ratio to the dissipation coefficient, namely:

                                                    7.Max. Steady State Current
                                                    The maximum allowable continuous current passing through thermistor at 25℃.

                                                    8.Resistance-temperature Characteristic
                                                  The reliant relationship between the zero power resistance of thermistor and its temperature.

                                                    R-T curve NTC thermistor

                                                    9.Static V-I characteristic refers to the relationship between voltage and current when NTC thermistor establishes the thermal balance state, because the variable range of the relationship between terminal voltage and current of thermistor is very wide, its voltage and current curve is often represent by double logarithms coordinates.

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