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GA10218_0101 - 5/2002
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4.1.4 Partial Flow Method
In the partial flow mode the test sample is additionally evacuated by an
auxiliary pump. Using the optional partial flow pump set offers to the user
the following advantages ( only possible for PhoeniXL
300
):
faster response
entry into the measure mode already at an inlet pressure of 1000 mbar
faster venting of large test objects
Alternatively to a partial flow pump set an external auxiliary pump may also
be connected via a tee, this option is possible for the PhoeniXL300 dry
and PhoeniXL300 Modul also. However, in such a case the PhoeniXL will
not be able to make measurements already at an inlet pressure of
1000 mbar.
4.1.5 Sniffer Mode
The PhoeniXL may simply be converted into a sniffer leak detector via the
rugged sniffer line (Cat. No. 252003)
For this the KF flange of the sniffer line is connected to the inlet flange and
the sniffer mode is selected through menu mode. After pressing START,
the inlet valve V4a opens. The sniffer lines have been designed in such a
way that the PhoeniXL is operated in the FINE mode (as described in
Chapter 4.1.3). If the forevacuum pressure P2 increases over 0,2 mbar
respectively 0,1 mbar a warning sign and audio alarm comes up in the dis-
play
In the measurement mode the helium present in the ambient air is now
indicated as the leak rate (about 2 · 10
-6
mbar l/s). Smaller leaks may be
detected by pressing the ZERO-button. In sniffer mode the smallest
detectable leak rate is < 1· 10
-7
mbarl/s.
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