Varian 990 dCLD II, Operation Manual

Page: 152 / 162

Model 990 dCLD II Component Leak Detector
C-6
C.6.1 Test Piece Evacuated (Figure C-1a and Figure C-1b)
The object to be tested is evacuated by the leak detector roughing pump, then valved into
the spectrometer vacuum system. The surface of the test object is then probed with a small
jet of helium to locate individual leaks, or surrounded by helium (hooded) for an overall
leak check.
Figure C-1a Test Piece Evacuated: Tracer Probe Used to Locate Leak
Figure C-1b Test Piece Evacuated and Hooded with Helium Atmosphere to
Determine Overall Leak Rate
C.6.2 Test Piece Pressurized (Figure C-2)
;
Figure C-2 Test Piece Pressurized: Detector Probe Used to Locate Leak