Water inspection, as the name suggests, is to put the workpiece into water, by observing the bubbles to determine whether there is a leak, this method is also called the bubble method. In the history of leak detection in China, water inspection has a place and played an important role.

With the acceleration of the industrialization process now, more products have strengthened the requirements for waterproof properties, and manufacturers have begun to seek a more convenient and accurate detection method - air tightness detector, and began to gradually replace water inspection. But many people wonder, such as some liquid products, why must be detected with an air tightness detector and not with water inspection?

Air tightness tester

Leak detection medium: "water" versus "air"

The air is compressive, has no fixed volume, and has a relatively low viscosity. Water has a fixed volume, which means that air passes through the leak point 100-400 times faster than water, which affects detection efficiency. Water has a surface tension, air is essentially no surface tension. This property means that water cannot pass through tiny leaks, while air can pass.

Detection method: water test compared with air tightness detector

The characteristics of the gas determine that the air cannot pass through the small leakage point that water cannot pass, so in the air tightness detection, the product that really does not leak does not exist, and the upper limit of the allowable leakage is generally set for the product. The air tightness detector can quantify the size of the leak and effectively organize the data. The water inspection requires human judgment by the naked eye, the disadvantage is that it is not objective, and the second is that the size of the leakage value cannot be specifically judged.

Summary, for individual products, the workpiece needs to be dried after water inspection, while the air tightness tester is completely pollution-free, no secondary treatment is required, and the density detection efficiency is higher than that of water inspection, which is more suitable for batch testing on the production line.