80 AK 98™ Dialysis Machine - Technical description
HCEN12630 Revision 07.2015
Program version 1.xx
EVVA , the Evacuation Valve will then briefly open and let out air – the level goes up. A
second reed relay is used to detect high level (too high level) in the chamber.
The valve, following immediately after the chamber – the TAVA, Taration Valve – is
used for the so-called taration or UF cell self-calibration. It will be described later in this
document.
3.3.3.6.6 UF control
The UF rate is controlled by the Suction pump. The AK 98 dialysis machine has one
“machine” treatment mode only: “Volume control”. In this mode the operator is required
to set two parameters:
● Treatment Time
● UF volume
From these two parameters the machine calculates the corresponding set UF rate: Set
UF rate = Set UF volume /Set Treatment Time
The set UF rate is displayed in the treatment overview fields.
If UF-profiling is used, the set UF-volume is changed over time according to the
chosen profiling curve. Three different profiling curves for the UF can be chosen:
LINEAR, STEP and INTERVAL. More information about UF-profiling is available in the
AK 98 operator's manual.
During treatment the actual UF rate is constantly measured by subtracting the channel
1 flow from the channel 2 flow.
The measured UF rate is compared to the set UF rate and the speed of the Suction
pump is controlled by the difference between them.
Once per minute the machine will check the remaining treatment time and the
remaining UF volume and internally adjust the set UF rate. The limit (high limit) for the
set UF rate is +20% of the rate set by “Time” and “UF Volume”.
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