Fresenius Medical Care 4008 4/08.03 (TM) 1-91
1.3.3 Central delivery system option
The central delivery system is connected to the connectors 121/122. The concentrate flows into
the rinse chambers via the inlet filters and the valves 102/104. Through the connected concen-
trate suction tubes, the concentrate pumps deliver the concentrate to the mixing point.
During hemodialysis, the valves 91/99 and 100 are closed. Depending on the central delivery
system, V102 and/or V104 are open.
During the cleaning programs, the valves 102 and 104 are closed. During the suction phase of
concentrate pump and bicarbonate pump, the valves 91 and 99 open for 500 ms upon each
balancing chamber changeover. Valve 100 is open.
In order to check the tightness of the valves 102 and 104, the pressure switch is tested during the
rinse-clear phase with following disinfection or hot disinfection or a mandatory rinse. To perform
this test, pressure is applied to the two lines between the check valves 117/118 and the valves
102/104. The pressure switches P123 and P124 are used to monitor the pressure. Three minutes
before the mandatory rinse program is completed, a functional check of the valves 91/99 and 100
is performed.
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