Leak Detection Systems
There are many different ways of testing for leaks, each with their own advantages and challenges. The correct selection of testing technique or combination of techniques for a given application is fundamental to the ultimate success and efficiency of a final installation. The testing of components can be broken into three fundamental types, Go-No-Go Test, and Location Testing, and Total Assembly Leak Testing.
Go-No-Go Tests evaluate the whole component or assembly for leaks and provide a Go-No-Go (Pass/Fail) measurement allowing a component to move on in the manufacturing process or be rejected pending further action. Pressure Decay, Inside-Out, and Outside-In vacuum tests would be classified as Go-No-Go Tests. These are relatively quick ways of testing the component, but they do not pinpoint a leak if there is one present. VTI addresses these needs with custom systems designed with specific component geometry and manufacturing throughput issues in mind.
Location Testing is a much slower process than Go-No-Go Testing and usually requires manual intervention. However, this method does pinpoint a leak on an assembly allowing corrective action to be taken which saves the part or assembly from scrap. Sniffer or Tracer Testing are classed as Location Tests.
Charge-In-Chamber Testing of the entire component or assembly utilizes a vacuum chamber with a variety of gases as the charge: Helium, Hydrogen, Refrigerant, and other tracer gases. Vacuumulation and Accumulation are other testing techniques for Total Assembly Leak Testing.