Waters Prep Series Installation And Maintenance Manual page 111

Rheodyne injector valve
The table below addresses Rheodyne injector symptoms that can occur during
operation.
Rheodyne injector troubleshooting
Symptom
Leakage
Needle seal leakage
Plugged valve passages Unfiltered solvent or
Waters autoinjector
The table below lists autoinjector symptoms that can arise while operating a
Waters autoinjector. Refer to the documentation that accompanies your
autoinjector for additional troubleshooting information and service
procedures.
Replace both the needle and seal pack at the same time, because needle
Tip:
seal-pack sets are individually matched for optimal performance.
Autoinjector troubleshooting
Symptom
Leak at seal pack
Cannot maintain high
or low pressure
Possible cause
Stator screws need
tightening
Scratches on rotor seal
Syringe needle smaller
than needle seal
sample
Possible cause
Damaged needle, seal
pack
Leak at needle, seal
pack
Corrective action
Tighten stator screws;
replace rotor seal.
Replace rotor seal.
Try another syringe
needle; gently push on
plastic needle guide to
deform PTFE sleeve to
provide a better needle
fit.
Remove the stator and
clean the passages with
a small wire (0.015-inch
maximum diameter).
Corrective action
Replace needle and seal
pack.
Replace needle and seal
pack.
Troubleshooting 3-27