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Pressure
Symptom Solution
System pressure
too low
Check the following:
Pressure gauge calibration.
Ensure tank outlet valve is open.
Ensure pump inlet and outlet tubing are
connected correctly. Ensure Sta-Pure
(white) tubing is connected from pump
outlet to feed in port (FEED IN).
If theuidmovesbackandforthinthe
pump inlet or pump outlet tubing, par-
ticulates may be impairing the pump check
valves from closing. Ensure pump check
valvesareclean.Seecheckvalveushing
procedure in maintenance section “Pump
check Valve Flushing” of this manual
If ushingthecheckvalvesdoesnot
eliminate the problem, replace pump check
valves. See check valve replacement proce-
dure in maintenance section “Diaphragm
Pump Maintenance” of this manual
System Pressure
too high
Check the following:
Pressure gauge calibration
The retentate back-pressure valve is closed