Vent delay, Vacuum ranges, See chapter – INFICON UL5000 Dry Helium Leak Detector User Manual
Page 59: To select
Description of the Menu
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6.6.1.2
Vent delay
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Through this menu item it is possible to define the delay time until the inlet port is
vented when operating the STOP button. When the STOP button is pressed for a
period of time which is shorter than the delay time specified here, the UL5000 will just
change to Stand-by mode.
When the STOP button is pressed for a period of time which is longer than the delay
time specified here, the UL5000 will vent the inlet port.
6.6.1.3
Vacuum ranges
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With this menu you can adjust different modes concerning the activity of leak
detection. This setting is only active in mode vacuum (see Chapter
Softkey 2:
Immediately
The inlet port will be vented immediately after pressing the STOP button.
Softkey 3:
After 1 second
The inlet port will be vented with a time delay of 1 second.
Softkey 4:
After 1.5 seconds
The inlet port will be vented with a time delay of 1.5 seconds.
Softkey 6:
after 2 seconds
The inlet port will be vented with a time delay of 2 seconds.
Softkey 7:
No vent
The inlet port cannot be vented with the STOP button.
Softkey No. 2: ULTRA ONLY
In this mode the UL5000 remains in the area ULTRA after running under
0,4 mbar at the inlet flange (see Chapter
). When showing the pressure at
the inlet flange > 0,4 mbar the UL5000 switches immediately into evacuation
mode.
Softkey No. 3: FINE only
In this mode the UL5000 remains after falling below 2 mbar at the inlet flange in
FINE mode. Valve V1a will be closed. When the pressure at the inlet flange is
increasing > 1 mbar the UL5000 switches immediately into evacuation mode.
The lower detection limit of FINE ONLY is 1×10
-10
mbar l/s.
The advantage of FINE ONLY is that while this mode is running no valve will
switch.
Softkey No. 5: ?
Help
Softkey No. 7: all areas (default settings)
This is the default setting. The activity runs as explained in Chapter