Mobile Leak Detectors

When foam-spray tests or bubble immersion tests fall short for your leak detection needs, a helium leak detector becomes essential for assessing vacuum products or vessels. This sophisticated device identifies leaks by measuring the movement of helium, a small and penetrative gas. Using a mass spectrometer, the detector ionizes helium particles, allowing them to create a measurable arc when they reach the ion collector. This advanced detection method enables modern leak detectors to identify leaks as small as 5 × 10⁻¹² mbar·L/s.

There are two predominant techniques for helium leak testing:

Sniffing Method
In the sniffing approach, the chamber is first evacuated and then backfilled with a small amount of helium. A probe is then moved across the surface of the part to detect any escaping helium. This method is highly precise and allows for accurate localization of leaks, especially beneficial when larger leaks are present. However, it requires meticulous attention and can take time as every area of the chamber must be checked.

Spraying Method
The spraying technique involves pumping down the system with the leak detector and then spraying helium over potential leak sites, such as welded seams and flanges. This method is quicker than sniffing but does not provide the same level of precision in identifying the exact leak location. Often, the spraying method will be followed by sniffing to pinpoint the leak area effectively.

Both techniques have their unique advantages and drawbacks. It’s advisable for your Quality department to evaluate which method best suits your specific application needs. While the sniffer method demands a higher level of precision from technicians and may take longer, the spray method offers speed but might necessitate further investigation to locate the leak accurately. By understanding these techniques, you can enhance your leak detection process effectively.