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Technical Information
Pressurized Systems
Many different types of pressurized systems also need to be leak-free. These
systems can be charged with helium or some mixture of helium and another gas
such as nitrogen. If a diluted helium mixture is used, the helium signal is diminished
proportionally. For example, if a mixture of 10% helium and 90% nitrogen is used,
the signal reads 10% of the actual value of the leak, or a decade lower. This may be
acceptable in many cases as system leak checking is usually to locate rather than
quantify leaks. Once the system has been charged with an appropriate amount of
helium, leak checking can be performed by means of a sniffer probe, or by bagging
suspected leak sites so that leaking helium accumulates to a detectable level.
Typical Leak Detection Applications
Quality Control of Production Parts and Assemblies
The detection and location of leaks is critical in the production of many products
from individual components, to subassemblies, to completed systems. In many of
these cases, it is as important to know the size or rate of the leak, as it is the
location. Whether quantitative or qualitative testing is required, our leak detectors
help assure the leak integrity of your parts or assemblies. Some examples include:
Evacuated parts and assemblies
Hermetically sealed electronic packages
Valves and manifolding
Feedthroughs/glass-to-metal seals
Vacuum vessels and systems
Pressurized parts and assemblies
Air conditioning and refrigeration assemblies
Radiators, heat exchangers, and condensers
Brake, fuel, and hydraulic lines
Gas tanks
Food storage tanks and packaging
Body implantable medical devices
High purity piping
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Agilent Helium Leak Detector User Manual
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