Gambro AK 95 S, Service Manual

Page: 30 / 247

AK 95 / AK 95 S Service Manual
HCEN 9134 Rev. 10.2005
Technical Description
2:9
MM 95:
The concentrate connectors are connected to the
water flow path by self-sealing valves.
The heated water flows through the feeding
pumps. The pumps are ceramic, and need a
constant flow of water through the pump ele-
ment; this acts as a lubricant.
In Bicarbonate mode the acid concentrate is
taken up through the red A-concentrate connec-
tor by the
A-pump and added to the water flow.
The acid/water mixture goes through a mixing
chamber, to prevent air from causing unstable
conductivity readings, before entering the A-
conductivity cell . The measurement from the
A-cell is compared with the required conductiv-
ity and any difference between the two will
result in a change of the A-pump speed to correct
the difference. There is a temperature trans-
ducer in the conductivity cell to compensate the
conductivity calculation since it varies with
temperature, approxi1,8 % per °C.
The bicarbonate concentrate is taken up through
the B-concentrate connector by the
B-pump and
added to the acid/water solution. The acid/
bicarbonate/water mixture goes through the
second
mixing chamber , to prevent air from
causing unstable conductivity readings, before
entering the
B- conductivity cell . The meas-
urement from the B-cell is compared with the
required conductivity and any difference be-
tween the two will result in a change of the
B-pump speed to correct the difference. There is
a temperature transducer in the B-conductivity
cell to compensate the conductivity calculation
since it varies with temperature, approximately
+1,8 % per °C.
When BiCart ® is mounted, the flushing valve,
FLVA, is used for priming of the BiCart car-
tridge. FLVA is also used during fill up of di-
luted chemical disinfection solution.
Note that in acetate mode the A conductivity cell
and A pump are not used. The acetate concen-
trate is taken up through the blue B-concentrate
connector.
The mixed fluid is then passing the (optional)
pH-sensor before leaving the MM 95.
B, Ac
A
B
T
Cond.
Cell "A"
T
Mixing Chamber Mixing Chamber
Feeding
Pumps
MM 95
A
Cond.Cell "B"
Bi-
Cart
FLVA
pH-SENSOR
Figure 4. MM 95 - Flow diagram