Arena Service Manual
8.3.5.1 Phase 1
Figure 8-8. Phase 1: Valves 1, 4, 6, and 7 are closed.
While compartment C2 is filling with fresh dialysate, the
diaphragm separating it from compartment C1 transverses the
cavity, forcing an equal amount of spent dialysate from C1 to the
drain. In this cycle, the amount of fresh dialysate entering C2 is
equal to the spent dialysate in C1 being displaced. At the same
time, spent dialysate enters compartment C3 forcing the diaphragm
to transverse the cavity, thereby pushing an equal amount of fresh
dialysate out of the compartment C4 to the dialyzer.
8.3.5.2 Phase 2
Figure 8-9. Phase 2: All valves are closed.
The solenoid valves which route the flow into and out of the flow
equalizer package all turn off for a short period of time
(approximately 130 milliseconds). This valve shut-off time helps
eliminate any significant effect on ultrafiltration accuracy that
8-12 157-1278-915 Rev A
January 2004
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