7. Dialysate Preparation
7. DIALYSATE PREPARATION
7.1 DIALYSATE PROPORTIONING
The proportioning ratio used by the Instrument for a particular
treatment is determined by the placement of the concentrate lines
in Rinse Mode, before starting Self-test and the dialysate selections
made in Calibration (Service) Mode.
There are two types of concentrates that can be used in the Arena
Instrument: Acetate and Bicarbonate.
• Acetate dialysate proportioning. Acetate proportioning
requires 34 parts water to 1 part acetate concentrate. This
option may be enabled or disabled by a qualified service
technician in Calibration Mode.
• Bicarbonate dialysate proportioning (also known as bicarb).
The Instrument may also be set by a qualified service
technician to accept a bicarbonate dialysate concentrate from
any of five mixing ratios as shown in Figure 7-1. Only one can
be chosen at any one time. The Drake Willock proportioning
is selected by default, requiring 34 parts water to 1 part acid
concentrate to 1.83 parts of bicarbonate concentrate, containing
sodium chloride (NaCl) and sodium bicarbonate (NaCHO
3
) in
the bicarbonate concentrate.
0
5
10
15
20
25
30
35
40
45
50
Bicarb
1.83 1.225 1.34 1.72 1.75
Acid
11111
Water
34 32.775 32.66 42.28 44
Drake Willock
(36.83X)
Fresenius (35X)
Fresenius
(French) (35 X)
Cobe (45X)
Cobe Ajax
(46.75X)
Figure 7-1. Acid/Bicarbonate Concentrate Formulations
The Single Board Computer (SBC) determines whether to
proportion for acetate or bicarbonate during the Rinse Mode by
157-1278-914 Rev A 7-3
January 2004
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