What is an air conditioner pressure sensor

What is an air conditioner pressure sensor

The pressure sensor is a device that is installed on the pipeline of the outdoor unit of the air conditioner to perform pressure detection. The pressure detection result is transmitted to the computer board to control other parts of the air conditioner.

　　 1. Working principle

　　 Pressure sensor is a kind of pressure sensor that can convert the detected pressure signal into an electronic signal, which is processed by the computer board chip, and the parts of the air conditioner are finely controlled according to the pressure detection result.

　　 Parallel diaphragms are usually made of the same kind of metal, separated by insulating materials, and the two diaphragms can also be made of other materials.

One of the metal diaphragms is fixed, and the other diaphragm can be as shown in the figure. When pressure acts on its surface, it will form a slight depression. The minute depression of the moving membrane caused by the pressure changes the gap between the two parallel diaphragms. It is equivalent to a capacitor. When the elastic diaphragm sinks under a certain pressure, its capacitance is changed. After the capacitance change of the capacitor is detected by a solid-state linear comparator circuit connected to the microprocessor, the solid-state circuit analyzes the signal , Amplify the signal output signal according to its proportion.

　　 Capacitive pressure sensor can detect pressures ranging from 0.1 inch water column to 1000 pisg. The working principle of the old pressure sensor is the same as the strain gauge or it is just a mechanical linkage mechanism.

　　2, location and difference

The unit unit generally does not add a pressure sensor due to the simple system. The pressure sensor is generally used in the frequency conversion central air conditioning unit, especially in the multi-line system. The exhaust and return lines of the compressor are equipped with high pressure pressure sensors and low pressure pressure sensors. .