ICS-90 Ion Chromatography System
5-12 Doc. 031851-05 12/04
5.6 Replacing a Pump Piston Seal
A damaged piston seal allows leakage around the piston at the head mounting
plate or around the base of the pump head. Flow rates will be unstable and there
may be baseline noise.
1. Turn off the power switch on the ICS-90 rear panel and disconnect the power
cord.
2. Open the ICS-90 front door.
3. Disconnect the tube fittings from the inlet and outlet check valves (see
Figure 5-4
).
4. Hold the head firmly against the pump housing, to compensate for the spring
loading, and remove the two nuts (see Figure 5-5
).
Lateral motion when disengaging the head from the piston can break
the piston.
Un mouvement latéral pendant la séparation de la tête et du piston
peut casser le piston.
Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Kopf vom Kolben
lösen. Andernfalls kann der Kolben brechen.
Figure 5-5. Removing the Pump Head
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