Differential Pressure Air Tightness Tester: How it Works and its Applications

B, Differential pressure type (also known as comparative type) air tightness tester: There are two interfaces at the back of the instrument, one connecting the standard product (qualified product) and the other connecting the test product.

1. The instrument simultaneously fills the standard product and the test product with equal air pressure. Then, the air source is cut off, and the difference between the air pressure in the standard product and the air pressure in the test product is observed. If the difference is zero, it means that the test product is qualified; otherwise, the test product is not qualified.

2. If the product does not have an inflation hole, a volumetric differential pressure air tightness tester is used. Two sealing chambers of the same size as the product shape and specifications need to be made. Then, the instrument fills the space between the standard product and the test product with the mold with air pressure. Then, the air source is cut off, and the difference between the air pressure in the standard product and the air pressure in the test product is observed. If the difference is zero, it means that the test product is qualified; otherwise, the test product is not qualified.