ICS-1000 Ion Chromatography System Operator's Manual

5•Service5.6 Replacing a Pump Piston Seal and Piston Rinse SealA damaged seal allows leakage past the piston, as well as leakage from thepiston seal wash housing. The pump may be difficult to prime, flow rates maybe unstable, and there may be baseline noise.Preparation1. Rinse the pump flow path with deionized water. Direct the flow to waste byopening the waste valve on the secondary pump head (see Figure 5-7). Toopen the valve, turn the knob one-quarter to one-half turn counterclockwise.2. After rinsing, close the waste valve.3. Close the eluent valve from the ICS-1000 Control Panel in Chromeleon.4. To prevent contamination of pump parts, put on a pair of rubber gloves beforedisassembling the pump head.Removing the Head and Piston1. Turn off the main power switch, to ensure that you do not unintentionally startthe ICS-1000.2. Disconnect all tubing connections to the pump head.3. Locate the open end wrench (P/N 014605) provided in the ICS-1000 Ship Kit(P/N 057905). Use the wrench to remove the two acorn nuts (see Figure 5-4)from the pump head.4. Slowly pull the head and allow it to separate from the housing. Carefullydisengage the head from the piston by pulling the head straight off and awayfrom its mounting studs.Lateral motion while disengaging the pump head from the piston maybreak the piston.Un mouvement latéral pendant la séparation de la tête et du pistonpeut casser le piston.Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Kopf vom Kolbenlösen. Andernfalls kann der Kolben brechen.Doc. 031879-01 3/03 5-13