- This system relies on the introduction of an inert contaminant that is easy to detect.
- Helium is introduced into the system and then an electronic gas detector, or 'sniffer', is used to find or pinpoint the source of the helium.
- This type of approach requires adequate seals to ensure the contaminant enters through leaks and not any other source.
- This approach works well around yards and other landscaped areas where a listening device may be impractical.
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