B. Braun Dialog+ - Dialysate Processing

2. Technical System Description 1/2010 2 - 31
BA-TE-DE08C M.KAY
Dialog+ SW9xx_sm_Chapter 2_1-2010.doc/pdf <100329> yymmdd
B. Braun Avitum AG
Dialog
+
SW 9.xx
2.20.3 Dialysate Processing
The dialysate processing has the following components:
•
Bicarbonate Concentrate Pump BICP
BICPBICP
BICP
•
Bicarbonate Throttle RVB
RVBRVB
RVB
•
Bicarbonate Temperature Sensor TSBIC
TSBICTSBIC
TSBIC
•
Bicarbonate Conductivity BICLF
BICLFBICLF
BICLF
•
Concentrate Pump KP
KPKP
KP
•
Concentrate Throttle RVK
RVKRVK
RVK
•
END Conductivity ENDLF
ENDLFENDLF
ENDLF
•
END Conductivity Supervisor ENDLFS
ENDLFSENDLFS
ENDLFS
•
Dialysate Temperature Sensor TSD
TSDTSD
TSD
•
Dialysate Temperature Sensor Supervisor TSDS
TSDSTSDS
TSDS
•
Inlet Flow Pump FPE
FPEFPE
FPE
•
Inlet Flow Pump Throttle RVFPE
RVFPERVFPE
RVFPE
•
Dialyser Inlet Temperature Sensor TSDE
TSDETSDE
TSDE
The main components of the dialysate preparation are the bicarbonate
concentrate pump BICP and the concentrate pump KP, with the conductivity
cells BICLF and ENDLF and a flow pump FPE. The flow pump FPE delivers the
dialysate. The bicarbonate concentrate, which is added via the bicarbonate
pump BICP, is measured by the conductivity measurement cell BICLF. Thereby
the pump can control the given conductivity set-point value.
The concentrate or acid concentrate addition has the same working principle.
The nonreturn valves RVB and RVK stabilise the dosage of the bicarbonate and
concentrate.
The temperature sensors TSBIC, TSD and TSDE are responsible for:
•
the temperature compensation of the conductivity measurement and
•
the temperature measurement TSD after the addition of cold concentrate
(second measurement sensor for temperature system) and
•
the temperature measurement TSDE directly before the dialysate leaves the
machine and thus for the compensation of the temperature loss.
The conductivity sensor ENDLFS is an independent monitoring unit (supervisor).
The geometry of the ENDLFS sensor is different (but has the same cell constant)
than the ENDLF sensor of the controller. Thereby a deposit on the sensor can be
identified. The temperature compensation is carried out by the temperature
sensor TSDS. The temperature sensor additionally monitors the dialysate flow
temperature for the supervisor. The ENDLFS and TSDS sensors have no influence
on the respective control.
The throttle RVFPE prevents a high pressure build-up and thus a bursting of
tubing if the flow path is blocked behind FPE. If the set pressure is reached
RVFPE is opened and the fluid can circulate.
BICLF
TSBIC
RVFPE
FPE
RVKRVB
BICP
8
T
KP
ENDLF-SENDLF
TSD
TSDE
TSD-S
T
T
DDE
BK2
BK1
VEBK2
VDEBK2
VEBK1
VDEBK1
MSBK2
MSBK1
VDE
T
Fig. : Dialysate Processing