Sheet #613u – Sealed components
Version 1.04a User guide ATEQ 6th series Page 1/8
SEALED COMPONENTS
1. PRESENTATION
The sealed component mode is designed for leak measurement on sealed parts. The solution is
to enclose the part in a sealed bell, to fill this bell and to measure the pressure drop in the part.
Principle:
The external volume is connected to the pressurization port of the instruments valve.
Volume fill:
The external volume (V1) is filled to a pressure P1.
Part transfer:
The previously-filled internal volume (P1.V1) is opened to the chamber volume (V2), obtaining
P2.V2. Through monitoring, the instrument detects large leaks. If the part has a large leak, the
final pressure is lower than with a sealed part. Two limits (min. and max.) given as a percentage
of the P1/P2 ratio are used to detect large leaks.
The solution is based on the relationship: P1.V1 = P2.V2
If the part is leaking, the final volume will be
greater so the final pressure will be lower.
Transfer Time
P1
P2
LARGE LEAK
Internal fill
volume V1 for
the ATEQ
instrument
Pressure
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