Thermo Scientific Dionex, Operator'S Manual

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Dionex Integral Systems Operator’s Manual
124
Doc. 065250-06 03/2020
10.2 Replacing Pump Check Valve Cartridges
These instructions apply to the dilution pump and the stepper motor loading pump
(P/N 068561, both pumps).
A dirty check valve causes erratic flow rates and pressures. In addition, it may
cause the pump to lose prime and/or be difficult to reprime. If possible, replace
both check valve cartridges. If new cartridges are not available, clean the
cartridges currently installed (see
page 126 ).
To replace the check valve cartridges:
1. Turn off the SP power.
2. Disconnect the power cord.
3. To prevent contamination of pump parts, put on a pair of powder-free gloves
before disassembling the pump head.
4. Disconnect the tube fittings from the inlet and outlet check valve assemblies
on the pump head (see Figure 10-1 ).
5. Use a 1/2-inch wrench to loosen both check valve assemblies. Remove the
check valve assemblies from the pump head.
Figure 10-1. Pump Head
Pump Head
Outlet Check Valve
Inlet Check Valve