Section 8 Maintenance
8-23
Delayed
signal
during
run
• Verify nitrogen pressure. Sample may drip
through the cone and still be detected later.
• Check priming valve tightness. A slight leak
will delay sample.
• Verify the splitting valve is not leaking.
• Check for leaks around other fittings on the
solvent interface.
Sample
masses
observed
but
weak,
or
masses
other
than
the
analyte
observed
• Check polarity to see if the sample ionizes
under the opposite polarity.
• "Try another ionization settings [I
• "Compound fragments- use fragment mass
or try another ionization setting.
• "Compound forms adducts.
• Compound fails to ionize using the selected
probe. Some compounds ionize better using
APCI rather than ESI, for example.
Table 8-3 General Troubleshooting
Summary of Contents for CombiFlash EZ Prep
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