990 CLD Autoline™ Leak Detector
DRAFT 2/2/04
6-1
Section 6. Fundamentals of Leak Detection
Leak Testing — Why is it Needed?
Even with today's complex technology, it is for all practical purposes impossible to
manufacture a sealed enclosure or system that can be guaranteed leak proof without
first being tested. Through the use of modern leak testing techniques, leak rates in the
2x10
−
10
std cc/sec range can be reliably detected. The discussion that follows provides a
brief summary of specific information pertinent to the overall subject of leak detection. First,
the reasons for leak testing can be grouped as follows.
Hermetic Enclosures
(or parts thereof)
These are tested to prevent entrance of contaminants or loss of fluid
that would affect performance of the enclosed unit. Examples:
electronic devices, integrated circuits, sealed relays, motors, ring
pull-tab can ends, and multi-pin feedthroughs.
Hermetic Systems
These are tested to prevent loss of fluid or gas within. Examples:
hydraulic systems and refrigeration systems.
Evacuated Enclosures
(or parts thereof)
These are tested to prevent too-rapid deterioration of vacuum with
age. Examples: electron tubes, TV picture tubes, bellows sensing
elements, full-panel-opening can ends, etc.
Vacuum Systems
These are tested to minimize inleakage and allow attainment of
better vacuum or higher gas removal ability at any given vacuum
(absolute pressure).
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