INFICON UL1000 Helium leak detector User Manual
Page 83
Description of the Menu
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Contamination protection
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> Contamination protection
If this mode is switched on the UL1000 and UL1000 Fab closes all inlet valves as
soon as the measured leak rate exceeds the programmed leak rate. Thus no more
Helium gets into the mass spectrometer. Helium that has gotten into the tool under
test can be pumped away by the tool pump. If no extra pump is available it is
recommended to vent the part before the test is continued.
Pressure limits for vacuum ranges
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>Pressure limits for vacuum ranges
With this function you can adjust the switching point between the modes GROSS-
FINE-ULTRA. This can be essential when other gases than air are pumped with the
UL1000 and UL1000 Fab. The control signal of the Pirani may vary at other gases
than air. Therefore it may be necessary to adjust the switching points.
Pressure limits for sniff mode
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> Pressure limits for sniff mode
This function is automatically activated in sniff mode. The pressure limits define an
upper and lower limit of the inlet pressure. The upper limit is 2 mbar, the lower limit
is 0.02 mbar. If the pressure is not in this range error messages are generated:
P > upper limit: Capillary broken
P < lower limit: Flow through capillary too low (Capillary blocked)
Softkey 3:
Off
Softkey 4:
edit the limit value
Edit the limit value for switching off
Softkey 5: Help
Softkey 7:
ON
Softkey 8:
OK
Softkey No. 2, 6: Change over threshold EVAC-GROSS
.15-3 mbar (Default value 15 mbar)
Softkey No. 3, 7: Change over threshold GROSS-FINE
2-0,5 mbar (Default value 2 mbar).
When changing this values the change over FINE-ULTRA threshold will
automatically be retightend to 0,4 - 0,1 mbar.
Softkey No. 4
Adjustment for ARGON
Press again the softkey for default values for air.
Softkey No. 5:
?
Help