Waters 717plus - Page 152

Troubleshooting 152
6
Sample carryover Sample injection
problem
To verify the problem, test with blank
injections of solvent after a sample
injection. If the carryover problem
occurs after a sample injection, this
may be due to a problem with the
needle wash system (see below).
Needle wash system
problem (due to loss
of prime, empty
solvent reservoir,
contaminated frits, or
defective needle wash
pump)
Verify these potential problem areas
and perform one of the following:
• Empty solvent reservoir – Refill
the needle wash reservoir.
• Loss of prime – Reprime the
needle wash system.
• Contaminated frits – Replace seal
pak.
• Defective needle wash pump –
Call Waters.
Injection from wrong
sample vial
Incorrect sample vial
number specified
Compare sample vial entry and vial
position. Enter correct sample vial
number in autosampler.
Sample vial
mislabeled
Verify information on sample vial.
Change label if necessary.
Misaligned sample
transport system
Call Waters.
Incorrect sample
volume injected
Incorrect injection
volume specified
Compare injection volume value and
vial position. Enter correct injection
volume value in autosampler.
Incorrect syringe size
value specified on
configuration menu
Compare syringe size value and
installed syringe. Enter correct syringe
size (see Section 3.6.3, Entering Hard-
ware Changes).
Incorrect syringe
installed in fluidic
system
Replace with appropriate size syringe
(see Section 5.2, Replacing the
Syringe).
Insufficient sample in
vial
Ensure minimum sample volume
requirement is in the vial (see
Appendix D, Selecting Sample Vials
).
Leaky syringe Repair/replace syringe (see autosam-
pler operator’s manual).
Table 6-8 Autosampler Troubleshooting (Continued)
Symptom Possible Cause Corrective Action