Inficon 550-300A, Operating Manual

Page: 59 / 128

Operation
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• Setpoint:
The frequency of the audio signal is proportional to the value of the leak rate. The
audio signal is only generated when the leak rate exceeds the Trigger 1 level.
• Trigger alarm:
If the Trigger level 1 is exceeded an audio signal will be generated.
6.9.5 Main Menu
o
Calibration (CAL) Mode Vacuum
o
Internal automatic
If the internal automatic calibration method is selected, the Modul1000 will perform
the complete calibration procedure automatically.
In the automatic calibration processes, the Modul1000 runs the following sequences
automatically:
• The internal test leak is automatically opened, The inlet is evacuated.
• Measurement of test leak
• Autotune (Calibration to maximum sensitivity of the mass spectrometer)
• The internal test leak is automatically closed, the helium background is
measured.
• The newly determined calibration factor is displayed
o
Internal manual
If a manual calibration method has been selected, several entries have to be made
during the calibration procedure.
1 Only for the external manual calibration method, the test leak value has to be
entered, when the displayed leak rate does not match with the value of the used test
leak. The internal manual calibration already starts with selecting the calibration
method.
The value of the used test leak can be entered by pressing the "Change leak rate"
button (also refer to chapter "Change values").
After the test leak value has been entered, start the calibration process by pressing
the "Start" button.
2
After starting the calibration process, the Modul1000 evacuates the inlet area.
3
As soon as the maximum intake pressure of the Modul1000 has been reached, first,
the Modul1000 displays a varying measuring signal in the shape of a bar display.
After a certain time period, which depends on the volume connected to the inlet, the
display will stabilize.
As soon as the bar displays a constant value, it has to be acknowledged by pressing
"OK".
4 In the next step, the Modul1000 adjusts the mass spectrometer to maximum
sensitivity.
5 Only in case the external manual calibration is required, the Modul1000 will prompt
you to close the external test leak.
As soon as the external test leak has been closed, it has to be acknowledged by
pressing "OK".
No action will be required for manual internal calibration.