124 Troubleshooting
6.4 Troubleshooting the Rheodyne 7725i Manual
Injector
Table 6-2 lists potential Rheodyne 7725i manual injector symptoms that may occur during
operation, along with possible causes and corrective actions.
Inadequate eluent
blending
(continued)
Pump malfunction Contact Waters Technical Service.
Mixers not
connected.
Contact Waters Technical Service.
High system pres-
sure due to pump
Pump flow rate set
too high
Set to the correct operating flow rate (see the Waters
600E Multisolvent Delivery System User’s Guide).
Pressure transducer
out of adjustment or
defective
Contact Waters Technical Service.
Blocked outlet
tubing
Clean or replace tubing according to Section 2.1,
Selecting and Installing Fittings, and the detector
operator’s guide.
Squeaking noise Pump seals dry Wet plunger with appropriate eluent through pump
head access holes.
Indicator rod
binding
Replace indicator rod (see Section 4.2.1, Pump Over-
view). For a list of pump head spare parts, see
Appendix A, Spare Parts.
Pump plunger seal
binding
Replace pump plunger seal (see Section 4.2.4,
Replacing the Plunger Seal).
Table 6-2 Rheodyne 7725i Injector Troubleshooting
Symptom Possible Cause Corrective Action
Siphoning (appears as
leakage)
Tubes from ports 5 and
6 (see Figure 2-2) do
not have outlet ends at
the same level as needle
port
Allow the loop and connecting tubes to
empty.
Table 6-1 600E System Troubleshooting (Continued)
Symptom Possible Cause Corrective Action
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