Fresenius Medical Care 4008 E Technical Manual page 95

1st cycle:
2nd cycle:
This system ensures that equal amounts of fluid enter and exit the dialyzer. This leads to an exact
balancing of the dialysate and, in conjunction with the ultrafiltration pump (22), a controlled
volumetric ultrafiltration.
Secondary air purging by the air separation pump 97
As soon as the fluid level in the secondary air separator (88b) has dropped below the level sensor
(6), this sensor activates the air separation pump (97). Should the fluid level not have reached the
level sensor (6) within a given time period, the FILL PROGRAM is started.
1-88
Fresenius Medical Care 4008 4/08.03 (TM)
Closed valves: 31, 34, 36, and 37
F1 is filled with fresh dialysate.
A1 used dialysate is discharged into the drain.
F2 fresh dialysate is forced into the dialyzer.
A2 is filled with used dialysate.
Closed valves: 32, 33, 35, and 38
F1 fresh solution is forced into the dialyzer.
A1 is filled with used dialysate.
F2 is filled with fresh dialysate.
A2 used dialysate is discharged into the drain.
Note
In order to recognize the fluid level, the level sensor (6) requires fluid with a
certain minimum conductivity, which is definitely achieved in all dialysis pro-
grams. Separation of air is only required in the dialysis programs. In all other
programs, the air separation pump (97) and the valve (43) are force-actuated.