Arena Service Manual
7.4 DIALYSATE PROPORTIONING CONTROL
The UF-Proportioning system controls the concentrate(s) to water
proportioning ratios by controlling the dialysate flow rate, and the
“A” and “B” concentrate flow rates.
The “A” and “B” concentrate pumps are stepper motor driven
piston pumps that deliver a calibrated volume of concentrate per
stepper motor revolution (see Section 7.3.2). Their flow rates are
controlled by controlling the speed of the stepper motors.
Figure 7-6. Proportioning Control Block Diagram
During the Rinse Mode, the Single Board Computer (SBC)
determines the concentrate treatment mode based on the “A” and
“B” rinse port interlock information. If the “B” concentrate line is
not on the “B” rinse port, a bicarbonate treatment is initiated by
setting the proportioning ratios and the conductivity alarm limits
appropriately. Conversely, if the “B” concentrate line is in the “B”
rinse port, an acetate treatment is initiated. The Powder Interlock
is used only with the Powder Bicarbonate Option (see Section 24).
7-10 157-1278-914 Rev A
January 2004
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