Suspected cause Possible solution
µSM-FL temperature is too high or low. Adjust the µSM-FL sample compartment
temperature.
Sample syringe draw speed set too high,
resulting in too little sample draw-up.
From the Method Editor, program a slower
draw speed.
Sample diluent composition contains too much
organic, resulting in poor peak shape.
Decrease organic in the sample diluent.
Vial position is incorrect. Program the correct vial position in the sample
list.
Incorrect sample preparation and sample
composition resulting in, or due to, one or more
of the following:
• Sample concentration too low
• Sample is not completely in solution
• Volatile sample is evaporating
• Sample is degraded
• Sample precipitated over time
• Sample prepared incorrectly
• Sample buffers and acids inappropriate for
the injection method selected
Select the appropriate sample preparation
method for the injection method selected and
remake if necessary.
Glassware incorrect or contaminated See also: Controlling Contamination in Ultra
Performance LC/MS and HPLC/MS Systems
on the documentation CD.
Vial, vial cap or well plate cap mat failure or
malfunction.
See also: The Waters vials, filters, and plates
selector at www.waters.com/app/selector/en/
index.html.
Column viability in question. See also: The appropriate column care and
use manual on the documentation CD.
4.4 Configuring maintenance warnings
Maintenance counters, if available for a particular component, provide information about real-time
usage that can help you determine when to schedule routine maintenance for specific
components. You can specify usage thresholds and maintenance warnings that alert you when a
component reaches a specified threshold. You can minimize unexpected failures and
unscheduled downtime during important work. For information explaining how to specify
maintenance warnings, consult the Waters console Help.
November 26, 2019, 715003588 Revision C
Page 74
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