Helium or Hydrogen/Nitrogen Mix is injected under pressure into the unit under test (UUT). An integrated leak detector senses the presence of any gas leaking out of the UUT and measures the corresponding leak rate. This test can be performed either in manual or automatic mode.
In order not to contaminate the working environment with large quantities of tracer gas, this test follows a prior Pressure Leak Test aimed to detecting gross leaks.
| Items |
 VTech 75 Tracer Gas Sniffing Leak Test System |
 VTech UNO-HE Tracer Gas Sniffing Leak Test System |
 MasSpec Automatic Outside-In Helium Leak Test System |
 VacuTester Automatic Helium Leak Test System in Vacuum Chamber |
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| # of parts/test | up to 4 | 1 or 2 | Customizable | Customizable | ||||
| Component Evacuation | Yes | Yes | Yes | No | ||||
| Test Type | Automatic and Manual | Automatic and Manual | Automatic | Automatic | ||||
| Leak Location? | Yes (with Sniffing Leak Detector) | Yes (with Sniffing Leak Detector) | No (Sniffing Leak Detector Required) | No (Sniffing Leak Detector Required) | ||||
| Pressure Decay Leak Test | Yes | Yes | No | Optional | ||||
| Tracer Gas | Helium or Hydrogen/Nitrogen Mix | Helium or Hydrogen/Nitrogen Mix | Helium | Helium | ||||
| Productivity | Low to Medium | Low to Medium | High | High | ||||
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