LEYBOLD 250000V01, Operating Manual

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Operation
GA10218_002_C0 - 10/2016 - © Leybold GmbH 73
fore vacuum pump is purged constantly to avoid helium accumulation. If the use of
the PHOENIX L300i DRY needs the possibility to shut off this function, fore ex.
because of a high helium background in the ambient and no option to connect a
hose line with fresh air to the gas ballast port, this function can be shut of here.
If you disable the purge mode in measurement some specifications as minimum
detectable leak rate, internal background or time constant may degrade.
3.10.2 Filter & Background
Main menu > Settings > Filter & Background
The type of leak rate filters and background condition can be chosen. The default
setting for the leak rate filter is auto.
The PHOENIX L300i DRY allows the following settings
Calculate inlet area background
Main menu > Settings > Filter & Background > Calculate inlet area background
This function calculates the background of the inlet area. The PHOENIX L300i has
to be in the following conditions:
1. Mode vacuum
2. Mode VENTED (min. 25 seconds)
Softkey 7: Enable (default)
The fore vacuum pump is purged constantly during the measurement
mode to avoid helium accumulation. This setting is the preferred setting
and should be used.
Softkey 3: Disable
This setting enables the purging during measuring mode, all disad-
vantages listed above may occur. It is recommended to use this setting
only in special applications.
Softkey 2: Calculate inlet area background
This function is for assignation of the background in the inlet area.
Softkey 3: Background suppression
Setting of the internal condition for the background.
Softkey 7: Leak rate filter
The type of leak rate filter can be chosen.
Softkey 3: Background suppression
Setting of the internal condition for the background.
Softkey 7: Leak rate filter
The type of leak rate filter can be chosen.
Calculate inlet area
background