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Understand the principles, methods, and technologies for ensuring vacuum system stability in industrial applications

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1. Importance of Leak Detection in Vacuum Systems
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Vacuum systems require extremely high levels of airtightness to maintain the desired low pressure. Even minor leaks can impact processes such as surface coating, material testing, or thermal processing. Without accurate leak detection, test results or product quality may be compromised, and the lifespan of equipment may be shortened.


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2. Types of Leaks in Vacuum Systems
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Leaks can generally be classified into two categories:

- Permanent Leaks: Such as poor welding or cracks in the material
- Temporary Leaks: Caused by misaligned seals, deteriorated O-rings, or significant temperature changes

Understanding the type of leak helps in selecting the appropriate detection method.


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3. Leak Detection Methods in Vacuum Systems
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3.1 Helium Leak Detector
The most commonly used method in high-precision industries. Helium gas is applied externally and its penetration into the system is detected by a mass spectrometer.

- Advantages: High sensitivity; capable of detecting down to 10⁻⁹ Pa・m³/s
- Considerations: Requires clean testing conditions and proper gas handling

3.2 Bubble Test
Liquid (e.g., soapy water) is applied to joints and the formation of bubbles is observed under pressure.

- Advantages: Simple and inexpensive
- Disadvantages: Low sensitivity; only suitable for large leaks

3.3 Pressure Decay Test
Pressure is applied to the system, and the drop in pressure over time is monitored.

- Advantages: Suitable for large systems
- Disadvantages: Requires accurate pressure measurement instruments


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4. Factors Affecting Inspection Accuracy
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- Temperature: Thermal expansion may temporarily create or eliminate leaks
- Surface Cleanliness: Oil or dirt may block small leaks
- Seal and Material Selection: Proper seals reduce the risk of temporary leaks


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5. Why Choose AXXEL ENGINEERING CO., LTD.
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AXXEL ENGINEERING offers more than just vacuum equipment manufacturing. With full-cycle services including design, production, installation, and inspection, they ensure high-quality and stable vacuum systems. Their reliable after-sales support makes them an excellent choice for industrial clients.

For more details, please download the PDF or contact us directly.


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