ABB NGC8200 - Table 6-7: Suggested Carrier Pressure Setpoint Adjustment Values

74 | NGC8200 AND PGC1000 USER MANUAL | 2101510MNAH
4. Type a new value in the Carrier Pressure Setpoint field. While analyzers vary from one to
the other, one PSI change will move the nC5 by 5 to 7 seconds, and C2 peak by 10 to 12
seconds. Increase pressure to decrease the time that the components elute and decrease
pressure to increase the time they elute.
Table 6-7: Suggested carrier pressure setpoint adjustment values
Chromatogram Incorrect peak time Carrier pressure adjustment
BBF: N2-C2 If the last peak is greater than 222 seconds Increase the pressure by 0.1
pounds for every second away form
220.
If the last peak is faster than 218 seconds Decrease the pressure by 0.1
pounds for each second away from
220.
BBK: C3-C6+ If the last peak is greater than 162 seconds Increase the pressure by 0.2
pounds for every second away from
160.
If the last peak is faster than 158 seconds Decrease the pressure by 0.2
pounds for every seconds away
from 160.
5. Click Send Setup.
6. Click Run Single Cycle. The chromatograms will update at the end of the cycle (typically in 5
minutes).
7. Verify that the changes are reflected in the chromatogram.
8. Repeat this process until you obtain preferred results.
6.6.1.2 Adjust Peak Gate times
Gate On and Gate Off times on the Peak Setup tab table determines when to start and stop looking for
peaks. Each Gate On/Gate Off time applies the parameters in its row to the peaks in its time frame.
The Gate On time should begin in an area prior to the first component peak and in a relatively flat
area on the baseline. Likewise, the Gate Off time should be on a flat area and not fall during a
component peak.
To modify peak gate time values:
1. Type a new value for Gate On and Gate Off times in the Peak Setup tab table.
2. Repeat step 1 for each component as required.
3. Click Send Setup.
4. Click Post Process. Chromatograms should update.
5. Verify that the changes are reflected in the chromatogram.
6.6.1.3 Label Peaks
If peaks are integrated correctly and column pressures are within range but no labels display, you
may need to label the peaks. You can label peaks from the Peak Table tab or the Chromatogram
view area.
To label peaks from the Peak Table tab (recommended):
1. Select the Peak Table tab.
2. For each row, select the Peak Assignment column field. A drop-down list of component
names displays.
3. Select the desired component name.
4. Repeat step 2-3 for each component (each row in the table).