304 Stainless Steel Temperature Sensor Probe Capillary Tube

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Because of the resistance value of the temperature sensor (commonly known as the temperature sensor), at different temperatures, corresponding to different resistance values, and the component itself does not have any manufacturer's model and parameter identification, which gives us more difficulty in repairing air conditioning.

General peers in the maintenance process is based on the measured resistance value and data comparison, or with the hand to grasp the temperature head, with the table to measure whether its resistance value has changed to judge its good or bad. These can probably tell the good or bad of the sensor. However, some sensors, when using the warm - up method, the resistance value is also variable, but its resistance value has been seriously deviated from the normal value. There are also models that are not familiar with and do not know the resistance values they determine.

Small editor to see many air-conditioning circuit diagram found that the air-conditioning sensor circuit is basically similar, are in the form of resistance voltage to provide signal voltage to the CPU for comparison calculation, to judge the outside temperature. If the measured voltage deviates significantly, the sensor can be judged to be damaged.

1. Different types of temperature-sensing head resistance value is different, but how to judge the temperature-feeling head good or bad?

Very simple, is to measure its voltage on-line, 25 degrees when the normal voltage is generally in the range of 2 to 2.5V.

2. Because the body temperature of a person is constant, so with the hand to feel the temperature of the head for a while, its voltage in the road is certain (about 2.17V).

3. Unplug the temperature-sensing plug, measure the resistance of the two pins of the seat in the line, and the resulting resistance is basically the model value of the temperature-sensing head at 25 degrees C (the method is not accurate after actual testing).

If it is about 8K resistance, the model value of the sensor temperature head is generally 10K, if it is 4.7K resistance, it is 5K temperature head, and so on.

(But there are some large air conditioners, variable frequency air conditioning external control panel temperature sensor resistance is 3 times the lower bias resistance, that is, the resistance measured by the above method multiplied by 3, that is, the sensor at 25C resistance.) )

4. The model value of the temperature-sensing head is its resistance value at 25 degrees C, usually 5K, 10K, 15K, 20K, 50K, these kinds, are generally negative temperature coefficient, that is, the higher the temperature, the smaller the resistance value.

5. Generally speaking, the temperature and room temperature resistance of the inner tube are the same.

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