INFICON UL1000 Helium leak detector - Manual (Page 68)

68
Description of the Menu
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6.6.1.3 Vacuum ranges
• Main Menu > Settings > Vacuum settings > Vacuum ranges
With this menu you can adjust different modes concerning the activity of leak
detection. This setting is only active in mode vacuum (see Chapter
6.3 ).
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 5: ?
Help
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 UL1000 and UL1000 Fab remains in the area ULTRA after running
under 0,4 mbar at the inlet flange (see Chapter
4.3.1 ). When showing the pressure
at the inlet flange > 0,4 mbar the UL1000 and UL1000 Fab switches immediately into
evacuation mode.
Softkey No. 3: FINE only
In this mode the UL1000 and UL1000 Fab 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 UL1000 and UL1000 Fab 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. 4: SOFTPUMP
In this mode the UL1000 and UL1000 Fab keeps the valve V1a closed when
pumping down in GROSS and FINE mode. So the pumping speed at the inlet is
reduced approx. by factor 2.
Softkey No. 5: ?
Help
Softkey No. 6: HIGHPUMP (only UL1000)
In this mode the UL1000 keeps the valve V1a open in ULTRA mode to increase the
pumping speed at the inlet in this mode. This helps shortening the pump down time
at bigger testing objects.
Softkey No. 7: NORMAL (default settings)
This is the default setting. The activity runs as explained in Chapter 4.3.1 .