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# What is NTC thermistor?

NTC thermistor introduction

1. What is a linear NTC temperature sensor? Linear temperature sensor is a linearized output negative temperature coefficient (referred to as NTC) thermal element, it is actually a linear temperature-voltage conversion element, that is through the operating current (100uA) conditions, the element voltage value with temperature was linear Change, to achieve a non-power to power linear conversion.

2. What is the main characteristic of linear NTC temperature sensor? The main features of this temperature sensor is the temperature-voltage relationship within the operating temperature range of a straight line, the secondary development of temperature measurement, temperature control circuit design will be without linearization, you can complete the temperature measurement or temperature control circuit design, simplified Instrument design and debugging.

3. Linear NTC temperature sensor’s temperature range is how to provide? In general, the temperature range can be between -200 ~ +200 ℃, but considering the actual needs, generally do not need such a wide temperature range, the provisions of three different sections to accommodate different package design, while the extension line selection is also available Different. The temperature compensation dedicated linear thermal components, only set the operating temperature range of -40 ℃ ~ +80 ℃. Fully meet the general circuit temperature compensation purposes.

4. What principle of extension of line selection should follow? Generally -200 ~ +20 ℃, -50 ~ +100 ℃ should use common double plastic line; 100 ~ 200 ℃ range should be used in high temperature line.

5. What is the meaning of the reference voltage? The reference voltage is the sensor temperature at 0 ℃ (ice water mixture), through the operating current (100μA) conditions, the sensor voltage value. In fact, 0:00 voltage. The symbol is V (0). This value is calibrated at the factory and the sensor temperature coefficient S is the same. Knowing the reference voltage value V (0), you can know the sensor voltage value at any temperature without indexing the sensor. The calculation formula is: V (T) = V (0) + S × T (the characteristic curve is shown in the following figure) Example: If the reference voltage V (0) = 700mV; temperature coefficient S = -2mV / ℃, , The sensor output voltage V (50) = 700-2 × 50 = 600 (mV). This is the linear temperature sensor is superior to other temperature sensors valuable.

6. What is the meaning of temperature coefficient S? The temperature coefficient S is the ratio of the change of the output voltage of the sensor to the temperature change under the specified working conditions, that is, the change of the output voltage of the sensor by 1 ° C for each change in temperature: S = ΔV / ΔT (mV / ° C). The temperature coefficient is a linear temperature sensor as a physical basis for the temperature measuring element. Its function is similar to the thermistor B value. This parameter has the same value over the entire operating temperature range, that is -2mV / ℃. The sensors of various models are also the same value. A little traditional thermistor temperature sensor is unmatched.

7. What is the significance of this parameter? Interchange accuracy refers to the same working condition under the same working conditions (the same working temperature, the same temperature field) to determine the ideal fit straight line, each sensor voltage V (T) - temperature T curve and the maximum deviation of the line, the deviation usually by sensor Temperature - voltage conversion factor S into the temperature equivalent to that. Sensor output linearization and temperature - voltage conversion coefficient of the same, that the whole temperature range of interchangeable, interchangeable precision that the reference voltage value of the discrete degree, that is, the reference voltage value of the discrete value converted into the temperature value of the size of the batch sensor Interchange degree. Generally divided into three levels: I grade exchange deviation of not more than 0.3 ℃; J-class not more than 0.5 ℃; K-class is not greater than 1.0 ℃.

8. What is the significance of linearity? Linearity is to describe the sensor output voltage value with temperature linearity, in fact, is the sensor output voltage within the operating temperature range

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