ABB NGC8200 - Troubleshoot Peak Find Issues

2101510MNAH | NGC8200 AND PGC1000 USER MANUAL | 73
6.6.1 Troubleshoot peak find
Table 6-6 lists some potential problems that may occur during peak find, their causes and
recommended solutions.
IMPORTANT NOTE: When making parameter changes, make sure you select the correct
component on the table (correct component row), or the correct component set for the
pressure/time duration parameters (click the C3-C6+ or N2-C2 button above these parameters).
Note that in systems with newer software revs, these buttons are labeled as BBK:C3-C6+ or
BBF:N2-C2.
Table 6-6: Peak find troubleshooting
Description
Cause
Solution
Unnormalized total is not
±0.5% of 100%
Carrier pressure set points are out of
range
See section 6.6.1.1 Adjust Carrier
Pressure Set Point
Peaks are integrated correctly but not
labeled
See section 6.6.1.3 Label Peaks
Peaks are incorrectly labeled See section 6.6.1.3 Label Peaks
Gate Markers are located
on the side of a peak
Front Height Ratio may need to be
refined
Call Technical Support for assistance
Gates may need to be added
See
section
6.6.1.2
Adjust Peak Gate
times
N2
-
C2 Chromatogram, C2
peak time is not eluting
around 220 seconds
Column 2 Carrier Pressure may not
be correct
See section 6.6.1.1 Adjust Carrier
Pressure Set Point
NC5 peak time is not
eluting at approximately
160 seconds
Column 1 Carrier Pressure may not
be correct
See section 6.6.1.1 Adjust Carrier
Pressure Set Point
A small peak elutes after
NC5 Peak
Inject time may be too long
See
section
6.6.1.4
Adjust the
Forward Flow Duration
Some components are not
gated correctly
Carrier Pressure Set Point may be too
high or too low
See section 6.6.1.1 Adjust Carrier
Pressure Set Point
Gate times may be incorrect
See
section
6.6.1.2
Adjust Peak Gate
times
IMPORTANT NOTE: Modifications to parameters in the Peak Setup table are processed by the
Post Process function without the need to run a cycle (Click Post Process after changes to
immediately view the effect of the changes). Modifications to the Pressure and time/duration
parameters require the run of a cycle (click Run a Single Cycle to view the effect of the changes).
6.6.1.1 Adjust Carrier Pressure Set Point
IMPORTANT NOTE: Changing the Carrier Pressure Set Point could cause the unnormalized
total to be outside range (±0.5% of 100%). You should always perform calibration and verify
results after changing the value of the Carrier Pressure Set point. Performing calibration restores
the unnormalized total to the correct range (±0.5% of 100%).
The analyzer has two column trains with their own carrier pressure regulator. Generally, if nC5 on
Column 1 elutes at approximately 160 seconds and C2 on Column 2 elutes at approximately 220
seconds, the unit performs optimally. There may be special applications which can cause these times
to be different.
If nC5 and C2 are not within 2 seconds of the above ranges, you may want to change the carrier
pressures. Note that changing the carrier pressures will move the other peaks.
To modify carrier pressures:
1. If not in expert view, click View on the top PCCU32 menu and select Expert. Wait for the
change to take effect and return to the analyzer Operation screen.
2. Click Hold on the Analyzer Operation screen and wait until the end of the cycle. The Operation
screen should indicate the analyzer is in Hold mode.
3. When the unit enters Hold mode, click Peak Find.