How to measure the quality of air conditioning temperature sensor?

Measure the resistance of air conditioning temperature probe with multimeter.

Temperature sensing probes commonly used in air conditioners have resistance values of 5K, 10K, 15K, 20K and 50K. The resistance values of these temperature probes refer to the resistance values measured at the ambient temperature of 25℃.

Because human body temperature is constant, when you hold it with your hand, the online voltage of the temperature sensor is constant (about 2. 17V).

If the resistance is about 8K, the model value of the temperature sensor head is generally10k; ; If it is a resistance of 4.7K, it is a temperature sensor of 5K; And so on.

In some large air conditioners, the resistance of the temperature sensor on the control panel of inverter air conditioner is 3 times of the lower bias resistance, that is, the resistance measured by the above method multiplied by 3 is the resistance of the sensor at 25℃.

Extended data:

The air conditioning temperature sensor is broken, and the display is as follows:

After the air conditioner is turned on, it cannot operate normally, and the air conditioner will not start the cooling function. The fault code will be displayed on the display screen of the air conditioning panel, and the operation of/kloc-0 will automatically stop after about 3 minutes.

Air conditioners generally have three temperature sensors, one is used to adjust the indoor temperature, which is located in the evaporator in the filter screen, and the other is to prevent the air conditioner from blowing cold air when heating in winter. The temperature sensor is usually fixed in the evaporator.

There is a temperature sensor at the exchanger position of the outdoor unit, which is used to control the heating work of the air conditioner in winter, so as to achieve the heating effect of the air conditioner.