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What are the leakage standards for air tightness testing?It is determined by the upper and lower limits of air intake and the upper and lower limits of leakage that are artificially set in the program.

How does the manufacturer set the values of "upper and lower air intake limits" and "upper and lower leakage limits"?

The upper and lower limits of air intake are generally set according to the test pressure of the product.The lower limit of air intake is generally greater than or equal to the product test pressure; the upper limit of air intake is generally 5-50kpa higher than the test pressure; there are three methods for setting the upper and lower limits of leakage:

1. Experience method, Air tightness detector manufacturer/product manufacturer sets settings based on past testing experience;

2. Experimental method: Use the manufacturer to conduct small batch testing based on the samples, and analyze and obtain relevant values based on the method of "gas inspection first, then soak in water";

3. Customer-given standards: Customers have their own standard values.For example, within 50pa, within 100pa, within 3ml/min, etc.

But the second most common one is the experimental method. I have shared relevant knowledge in the following article.Click the link below to get there.

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It talks about one-to-one correspondence between the air inspection and traditional water inspection results through experiments to obtain the judgment criteria for air tightness testing. If you are interested, you can click to read and understand the operation and principle.

After introducing how the judgment criteria for air tightness testing are obtained, let’s share which air tightness testing equipment is better to use.

Air tightness detector is roughly divided into two types:

1. Direct pressure

2. Differential pressure

When we choose instruments, there are many instruments from various brands on the market, and the styles are also confusing.

Therefore, when selecting instruments, we generally consider the following factors:

1. Whether the text can be read;

2. Whether the screen interaction is buttons or touch;

3. Whether the program is simple and easy to use;

4. Whether the instrument conforms to human mechanics;