What is the working principle of air-conditioning barometer?

The working principle of the air-conditioning pressure gauge is that when the pressure in the system is higher or lower than the rated safety pressure, the disc in the inductor moves instantaneously, and the switch connector is pushed on or off through the connecting guide rod. When the pressure drops or rises to the rated recovery value, the disc instantly resets, the switch automatically resets, and the free end of the elastic element is displaced, which directly or after comparison pushes the switch element to change the on-off state of the switch element, thus achieving the purpose of controlling the measured pressure. Manifold pressure gauge is an indispensable tool for maintaining automobile air conditioning system. It can be connected with the refrigeration system for vacuumizing, adding refrigerant and diagnosing the faults of the refrigeration system. The pressure gauge group has many purposes, which can be used to check the system pressure, fill the system with refrigerant for evacuation and fill the system with lubricating oil. The manifold pressure gauge should be connected to the automobile air conditioning system through rubber hoses. Rubber hoses come in many different colors. Usually, the blue hose is used on the low-pressure side and connected to the maintenance valve on the low-pressure side of the system. The red hose is used on the high-pressure side and connected with the high-pressure side maintenance valve; Green or yellow is used to connect vacuum pump or refrigerant tank.