1、 Overview of Basic Principles

The integrity tester mainly uses physical principles such as pressure, vacuum, or bubble detection to evaluate the integrity and sealing of the tested object (such as gloves, packaging bags, filters, etc.). These principles are based on the physical behavior of matter under different conditions, such as the fluidity and pressure changes of gases and liquids.

2、 Specific working principle

Stress testing method

Principle: By applying a certain gas or liquid pressure inside or outside the tested object and monitoring the changes in pressure, it is possible to determine whether the tested object is leaking or damaged.

Application example: Glove integrity testers typically use this method. The gloves are placed in the testing chamber and a certain gas pressure is applied through the control system. If the gloves are damaged or have holes, gas will leak out, causing a decrease in pressure inside the testing chamber. The pressure sensor equipped with the detector will monitor this change in real time and issue an alarm when the pressure drops to a certain level.

Vacuum testing method

Principle: Place the tested object in a vacuum environment and determine its sealing performance by monitoring changes in vacuum level. If there is a leak in the tested object, the vacuum level will rapidly increase.

Application example: This method is commonly used in packaging bag sealing integrity testing equipment. By applying a certain degree of vacuum inside the packaging bag and observing the changes in vacuum, the sealing performance of the packaging bag can be determined.

Bubble leak detection method

Principle: Apply a certain pressure to the object being tested in water and observe if any bubbles escape from the object being tested. This method is intuitive and simple, but requires careful operation to avoid human error.

Application example: The packaging integrity tester may use this method when detecting certain packaging materials. By applying pressure to the packaging in water and observing whether any bubbles escape from the packaging, the sealing of the packaging can be determined.

Other specific principles

For an automatic filter integrity tester, its working principle may involve the concept of bubble point pressure. Bubble point pressure refers to the gas pressure at which liquid is squeezed out of a wet membrane. When the pressure of the gas is greater than the capillary pressure and surface tension inside the membrane pore, the liquid can be squeezed out of the membrane pore. By monitoring this pressure change, the integrity of the filter can be evaluated.

3、 Summary

The working principles of integrity testers are diverse, but overall they are based on physical principles to evaluate the integrity and sealing of the tested object. Different testing methods and principles are applicable to different application scenarios and requirements. In practical applications, it is necessary to select appropriate detection methods and instruments based on the characteristics and detection requirements of the tested object.