Dionex ICS-3000 - Page 216

ICS-3000 Ion Chromatography System
200 Doc. 065031-04 1/08
If the leaking check valve is loose, follow these steps to tighten it:
1. Turn off the pump.
2. Loosen the check valve enough to allow it to turn freely.
3. Tighten the check valve fingertight, and then tighten it one-quarter turn
with a 1/2-inch wrench.
4. If the check valve continues to leak, tighten it an additional one-quarter
turn with the 1/2-inch wrench.
5. If the check valve continues to leak, it is defective. Replace both check
valve cartridges (see Section 9.4
).
• Eluent proportioning valve leaks (gradient pump only)
Tighten loose fittings. If there are no loose fittings, the proportioning valve
assembly should be replaced. Contact Dionex for assistance.
• Priming valve knob leaks
If leaks occur when the priming valve knob is open, close the knob completely
and then open it one-half to three-quarters turn. If this does not stop the
leakage, replace the seal in the priming valve knob (see Section 9.8
).
If leaks occurs when the priming valve knob is closed, either the pump head
or the knob is damaged and should be replaced. Contact Dionex for
assistance.
• Excessive system backpressure
If system backpressure is substantially higher than the normal operating
backpressure for the currently configured system (including the column),
tubing may be plugged or overtightened. Follow the procedure below to
isolate segments of the flow path and determine the sources of the high
backpressure.
1. Remove the pump outlet tubing at the injection valve.
2. Press the
POWER button on the front of the DP/SP to turn on the pump.
3. Set the Flow rate to 1.0 mL/min on the Chromeleon or Chromeleon
Xpress Control panel and record the backpressure.
4. One at a time, reconnect each component (tubing, fittings, etc.) of the
flow path. If reconnecting a component causes an abnormal increase in