ICS-1000 Ion Chromatography System Operator's Manual

5•Service5.5 Cleaning and Replacing the Pump Check ValvesA dirty check valve causes erratic flow rates and pressures. In addition, itmay cause the pump to lose prime and/or be difficult to reprime. If possible,replace dirty check valves. If new check valves are not available, follow theinstructions for cleaning.Replacing Check Valves1. Close the eluent valve from the ICS-1000 Control Panel in Chromeleon.2. Turn off the main power switch, to ensure that you do not unintentionally startthe ICS-1000.3. To prevent contamination of pump parts, put on a pair of rubber gloves beforedisassembling the pump head.4. Disconnect the tube fittings from the inlet and outlet check valve assemblieson the primary pump head (see Figure 5-4).5. Use a 1/2-inch wrench to loosen both check valve assemblies. Remove thecheck valve assemblies from the pump head.Outlet CheckValveSecondaryPump HeadPrimaryPump HeadAcorn NutsInlet CheckValveFigure 5-4. Pump HeadsNOTEThe inlet check valve assembly housing has a 1/4-28 port.The outlet check valve assembly housing has a 10-32 port.Doc. 031879-01 3/03 5-11