2. Technical System Description 1/2010 2 - 37
BA-TE-DE08C M.KAY
Dialog+ SW9xx_sm_Chapter 2_1-2010.doc/pdf <100329> yymmdd
B. Braun Avitum AG
Dialog
+
SW 9.xx
Phase 3
With UFP running, a negative pressure of –100 mmHg is created at PDA. When
this pressure is reached VD opens. The disinfectant is sucked into the hydraulic
system by the UFP via the dialyser connectors. The circulation valve VZ is open
and fluid flows into the upline tank of the water block WAB, because the
throttle RVDA acts as a forward resistance. As soon as the correct volume is
reached, the upline tank VB is filled up with fresh water (VVBE is controlled by
NSVB).
EK
KSB KSK
KE
BE
SKKSSKBS
SB2
SB1
RVUFP
C
D
DDE
VBP
B
C
FBK2
FBK1
KE
BE
V.D.
Z.D.
FKFB
FVD
RVFPA
LAFS
KVA
BVA
RVDA
VZ
VLA
VDA
VABK2
VDABK2
VABK1
VDABK1
BK2
BK1
VEBK2
VDEBK2
VEBK1
VDEBK1
MSBK2
MSBK1
LA
UFP
ENDLF-S
SS
BIC
KSS
SBS2
SBS1
ENDLFBICLFTSBIC
TSD
RVFPE
BL
FPE
PDA
FPA
TSD-S
DMV
VVBE
TSE
H
WAB
NSVB
TSHE
T
T
8
T
FD
LVD
VD
M
A
D
T
8
VB WT
FEP
T
VDETSDE
V
A
PEV*
T
EP
VEB
PE TSH
T
8
RVK
RVB
A
B
BICP
KP
Fig. : Phase 3
Phase 4
The machine starts to recirculate the fluid, heating the system up to the desired
temperature (e.g. 83
o
C). Once this temperature is reached and a desired
conductivity is reached (e.g. 2.2 mS/cm) the disinfection timer starts.
Phase 5
The machine recirculates the fluid, monitoring the temperature and
conductivity until the disinfection time is reached. There is no flow of fluid to
the drain during suction, heat-up and circulation. Then the machine starts with
the VBICP test. The machine checks whether VVB and VBICP open and close
properly. During the first step of this test VVB and VBICP are closed. With FPE
and FPA still running this causes a negative pressure at PDA. VBICP then opens,
causing a rapid increase in pressure at PDA.
Phase 6
The machine then starts to rinse with VZ closed until the rinsing time is
reached, and the temperature has decreased below 40
o
C and conductivity is
below 0.1 mS/cm. Then the machine gives a message that asks the user to
confirm that the machine is free of disinfectant and the disinfection is
completed.
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