Installation and Start-Up | 3-43
6. If the analyzer is configured with only the standard H
2
S output,
then it is likely that the factory default Switch Interval setting will
be correct for the application. Check that the H
2
S concentration has
stabilized into a plateau before the columns switch. If the columns
are switching before the H
2
S concentration has stabilized, the Switch
Interval is too short and should be increased.
7. If the analyzer is configured with the COS output in addition to the
standard H
2
S output, check to ensure the COS concentration has
stabilized into a plateau before the columns switch. If the columns are
switching before the COS concentration has stabilized, the Switch
Interval is too short and should be increased.
8. If the analyzer is configured with the MeSH output in addition to the
standard H
2
S output, check that the MeSH concentration has sta-
bilized into a plateau before the columns switch. If the columns are
switching before the MeSH concentration has stabilized, the Switch
Interval is too short and should be increased. Verify that the EtSH elu-
tion described in Step 5 is not occurring.
To avoid potential interference from EtSH elution, analyzers with the
MeSH output option should be set up to switch the columns as soon
as a reasonably stable MeSH reading is achieved.
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