How to determine the resistance of air conditioning temperature sensor

- temperature sensor manufacturer - Katie, through the analysis of the temperature sensor circuit structure, combined with years of experience in maintenance, to introduce you to a way to quickly determine its resistance. In the air conditioning controlled by CPU circuit, temperature sensor is essential element, is also vulnerable components. Its damage or poor performance, light air conditioning work state disorders, or can't boot up. Because each brand air conditioning use different sensor resistance, even with brand used by different types of air conditioning is different also, this has caused a certain difficulty to maintenance personnel maintenance, often cannot accurately judge whether sensors are often, or don't know exactly how the use value of the sensor. Three road sensors are respectively and a resistor in series, to + 5 v ( Part of the air conditioning is 33 + v) Voltage to the partial pressure and partial pressure of voltage into inside the CPU. Due to the air conditioning temperature sensor is the negative temperature coefficient are used thermal resistance, as well as an increase in temperature when the resistance is reduced, the temperature falls resistance increases, the input voltage to the CPU by law is that at higher temperatures, the CPU of the input voltage increases, the temperature falls, the CPU to reduce the input voltage. The change of voltage to the CPU internal circuit analysis, to determine the current tube temperature or room temperature, and through the internal procedures and manual setting, to control the running status of air conditioning. Due to CPU sampling the voltage will change along with the change of temperature in a wide range, so the factory at design time, generally will be subject to 25 ℃, designs the sampling voltage power supply voltage of the half, so that the voltage changes caused by temperature change to set aside sufficient room for manoeuvre. If too high or too low voltage sampling design, will not be able to reflect the current normal temperature changes. Because R1, R2, R3 resistance is constant, if we do not consider CPU interface circuit inside the resistance value ( The internal resistance of the interface in fact is bigger, can consider) , to ensure that A, B, C three voltage is 2 v or so ( In the condition of 25 ℃) RT1, RT2, RT3 can only try to use with R1R2R3 resistance value of the sensor or point voltage deviations are more pressure drop. According to above analysis can be concluded that the air conditioning in overhaul, can with the sensor in series resistance tolerance to judge whether the resistance of the sensor is normal. But should pay attention to the influence of the current temperature on the sensor resistance. When need to replace a sensor, as long as the measurement and the series resistance of resistance, and then choose and it's close to the value of sensor
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