Chromatographic Symptoms 2
Agilent 7697A Troubleshooting 21
Low Peak Area or Height (Low Sensitivity)
• Check gas supply purity.
• Check all trap indicators and dates.
• Check the GC.
• If possible, mount an automatic liquid sampler (ALS)
over the inlet and inject a sequence of internal or
calibration standard directly into the inlet. Check the
sensitivity. If acceptable, check the HS. If unacceptable,
the problem is in the GC.
• If the problem is in the GC, refer to the GC’s
documentation for troubleshooting procedures.
• Check sample vial size. (The HS cannot distinguish
between 20- mL and 22- mL vials.)
• Check the configured sample loop size. If incorrect, the
peak areas may be reduced due to insufficient headspace
pressure for filling a bigger sample loop than configured.
• Check the HS sequence log, event log, and status displays
for messages. Especially check the sequence log for
method deviations and dynamic leak check failures.
• Check that the transfer line is correctly installed at both
ends.
• Check for leaks at the six port valve and within the rest
of the sampling system (sample probe, its connections to
the six port valve).
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