Inficon 540-200, Translation Of The Original Operating Instructions

Page: 54 / 90

6 | Operation INFICON
54 / 90 T-Guard2_Operating-instructions-jina85en1-13-(2009)
Measuring time You can overwrite the measurement time automatically selected by the device. A
longer measurement time provides a more accurate result, a shorter measurement
time provides a less accurate result.
The measurement time should not be shorter than half of the time automatically set by
the device.
► In the main menu, select “Settings > Measurement settings > Set times >
Measurement time”.
A further menu command resets to the automatically set measurement time:
► In the main menu, select “Settings > Measurement settings > Set times > Set times
automatically”.
Volume (accumulation
measurement only)
Enter the net volume of the measurement chamber (volume of the measurement
chamber minus the volume of the test object).
► In the main menu, select “Settings > Measurement settings > Accumulation
volume”.
The setting range is 0.01… 10000 liter
To determine the volume, you can carry out the device volume test, see Basic settings
[
}
40]
Carrier gas flow (carrier
gas measurement only)
Enter the carrier gas flow.
► In the main menu, select “Settings > Measurement settings > Carrier gas flow”.
The setting range is 60 sccm… 1,000,000 sccm
To determine the carrier gas flow, you can carry out the device flow test, see Basic
settings [ } 40]
Measuring in a nitrogen
environment
For the highest measurement sensitivity, the measurement must be carried out in a
helium- free environment. This is possible when measuring in a nitrogen-filled
chamber.
So that the T-Guard2 does not interpret the complete absence of helium as a
malfunction, you need to switch off the corresponding monitoring (minimum current
test):
► In the main menu, select “Settings > Monitoring > Without He (N2)”.