Arena Service Manual
reading the “A” and “B” concentrate port interlock information.
Proximity sensors on the “A” and “B” concentrate ports relay the
information on whether the “A” and “B” concentrate fittings are in
their respective ports. When the concentrate connector is in the
rinse fitting, a pulsed infrared LED signal reflects off the
concentrate connector onto a phototransistor in the other portion of
the proximity sensor. This information is relayed through the I/O
Hydraulic Power board and the I/O Controller to the SBC. Upon
successful completion of Self-test, the concentrate treatment mode
is set for the remainder of the dialysis treatment. In order to
change between acetate (if enabled) and bicarbonate dialysis, the
Instrument must be in Rinse Mode.
• The Instrument will perform an acetate dialysis if acetate is
enabled, the A concentrate line (pink connector) is removed
from the concentrate interlock, and the B concentrate connector
(blue connector) remains attached to the interlock. If acetate is
not enabled, then the Instrument will always run bicarbonate,
regardless of which interlocks are open.
• The Instrument will always perform a liquid bicarb dialysis if
both the A and the B concentrate lines are removed from the
concentrate interlock.
• If both the bicarbonate and powder (dry bicarbonate)
concentrate lines are open, the Instrument will alarm (only for
the dry bicarbonate option).
• The Drake Willock proportioning ratio is not compatible with
the powder option. (See Section 24, Powder Bicarbonate.) One
of the alternate proportioning ratios listed in Figure 7.1 must be
used for powder bicarbonate dialysis
• If a Cobe formulation has been selected, the proportioning ratio
is for Cobe bicarbonate only, regardless of the concentrate line
placement. No acetate proportioning is allowed.
7-4 157-1278-914 Rev A
January 2004
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