8513826 Auto Engine Parts Sensor

   Turn on the power supply. When the air pressure in the air reservoir drops to 0.35 ~ 0.38mpa, the air pressure under the diaphragm of the air pressure alarm switch decreases, so the diaphragm moves downward under the action of the return spring to close the contact, the circuit is connected, and the alarm light is on. When the air pressure in the air reservoir rises to more than 0.45MPa, the return spring is compressed due to the increase of the air pressure under the diaphragm, the contact is opened, the circuit is cut off, and the alarm light is off.
   If the air pressure is insufficient, in addition to the alarm light on, some cars will also use a buzzer to remind the driver. Most of the insufficient air pressure is due to air leakage of the air pipe connector, soapy water, accurate detection of the tightening of the adhesive tape bag