Arena Service Manual
time in minutes. The infusion time varies from 16.5 seconds to
infuse 11 mL of 500 g/L citric acid to 4 minutes and 7 seconds to
infuse 165 mL of 100 g/L citric acid.
Table 9-1. Citric Acid Volume to Be Infused
Final Dialysate Concentration (g/L)
2.0 3.0 4.0 5.0 6.0
100 55 82 110 137 165
150 35 55 70 92 110
200 27 41 55 69 82
250 22 33 44 55 66
300 17 27 35 46 55
350 15 24 31 42 48
400 14 21 27 39 41
450 12 19 25 33 37
Citric Acid (g/L)
500 11 17 22 27 33
Table Note: Values inside the darker box are in milliliters (mL).
Example:
Using Table 9-1, when citric acid at a concentration of 250 g/L is
infused to achieve a fluid path (final dialysate) of 6.0 g/L, a
volume of 66 mL must be infused for 1 minute and 39 seconds (see
equation below).
= 1.65 minutes = 1 minute 39 seconds
66 mL
40 mL/mi
The desired citric acid concentration is monitored by the
Instrument during automatic infusion by means of the citric acid’s
conductivity value.
The expected conductivity vs. citric acid concentration is shown in
Table 9-2. Along with the expected conductivities are detection
thresholds that must be met in order for the Citric Acid Heat
Disinfection cycle to function properly. The detection threshold
may be set closer to the expected conductivity value (see Section
17.3.5.8).
9-10 157-1278-916, Rev A
March 2004
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