Basic principle: a certain pressure of the gas, while filling into the same volume of the standard workpiece and the workpiece to be measured, close the valve, after balance and stability, measure the air pressure difference between the standard workpiece and the workpiece under test, the difference is the actual leakage value, because the sensor to obtain the air pressure difference value is independent, so the test method is not affected by the inflation pressure and restrictions, and the accuracy is relatively high.

Testing Process:

It can be seen from the differential pressure test curve that the use of an air leak meter obtains an effective curve and obtains Δ P, which can accurately determine whether the product is qualified.