Sniffer Leak Detection | Vacuum Leak Detection | |
|---|---|---|
Method | Sniffing the test gas-filled test object | Spraying with helium |
Mechanical strength | Against overpressure | Against atmospheric pressure from the outside against vacuum (pressure difference 1000 hPa) |
Detection limit | < 1 · 10-8 Pa m3 s-1 | < 5 · 10-13 Pa m3 s-1 |
Sniffer Leak Detection | Vacuum Leak Detection | ||
|---|---|---|---|
Method | Accumulation test, collection of escaping test gas in an enclosing shell or chamber | Test specimen under overpressure, measurement of escaping test gas in a vacuum chamber | Test specimen under vacuum, measurement of test gas escaping from an enclosing shell into the test specimen |
Mechanical strength | Against overpressure of the test gas | Against overpressure of the test gas | Against atmospheric pressure from outside against vacuum (pressure differential 1000 hPa) |
Speed | slow | fast | < 5 · 10-13 Pa m3 s-1 |
Limit of detection | Use mainly > 1 · 10-5 Pa m3 s-1 | < 5 · 10-13 Pa m3 s-1 | < 5 · 10-13 Pa m3 s-1 |
