Sealing Tester is an instrument used to test the sealing performance of the product under test. It can determine whether there is leakage of the product under test by detecting the pressure change in the confined space, so it is also called airtightness leak detector, leakage test equipment.
Based on the different test methods, the seal tester can be divided into the following types:
Positive Pressure Seal Test: The product under test is placed in a closed space, and then the space is filled with compressed air or nitrogen. If there is a leak in the product under test, the leakage gas will escape from the leakage channel, resulting in a decrease in pressure in the confined space. The sealing tester can determine if there is a leak in the product under test by detecting the pressure change in the confined space.
Negative Pressure Seal Test: The product under test is placed in a confined space and air or gas is pumped out of the space. If there is a leak in the product under test, the leakage gas will enter the confined space from the leakage channel, resulting in an increase in pressure within the confined space. The Seal Tester can determine if there is a leak in the product under test by detecting the pressure change in the confined space.
Vacuum Seal Test: The product under test is placed in a vacuum chamber and then evacuated. If there is a leak in the product under test, the leakage gas will enter the vacuum chamber from the leakage channel and cause the pressure in the vacuum chamber to rise. The seal tester can determine if the product is leaking by detecting the pressure change in the vacuum chamber.
The results of a seal tester are often expressed in terms of leakage rate. Leak rate is the ratio of the volume of gas or liquid passing through the leakage channel per unit time to the area of the leakage channel. The smaller the leak rate, the better the seal.
Sealing testers are used in a wide range of applications, including new energy, small home appliances, medical devices, consumer electronics, auto parts, security lighting and other industries. Sealing testers can help companies ensure the quality and safety of their products.
Here are some examples to help understand the testing principles of a seal tester:Suppose a bottle is filled with gas and then sealed. If there is a leak in the bottle, the leaking gas will escape from the leakage channel, causing the air pressure inside the bottle to decrease. The seal tester can determine if there is a leak in the bottle by detecting the change in air pressure inside the bottle.
Suppose a vacuum tube is sealed. If there is a leak in the hose, leakage gas will enter the hose through the leakage channel, causing the pressure inside the hose to rise. A seal tester can determine if a vacuum tube has a leak by detecting the pressure change inside the tube.
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