Component Description; Pressure Regulator; Conductivity Measuring Unit; Degassing Chamber - Gambro AK 95 S Service Manual

Technical Description

Component Description

Heater relay board
The heater relay board comprises the following:
• Opto relay
• Heater safety relay
• Heater sensor ("energized")
Pressure regulator, PR 2
The pressure regulator is adjusted to give cor-
rect pressure (approx.. +130 mmHg).

Conductivity measuring unit

The unit includes the following components:
• Measuring cell.
• Conductivity board, which is mounted
directly on the measuring cell. The con-
ductivity board interfaces to the CPU
board, via a board connector and a flat
cable.
• Temperature transducer.

Degassing chamber

The AK 95 S contains one degassing chamber
used to separate air from the dialysis fluid.
The degassing chamber comprises a mechanical
float valve.
Mixing chambers
The AK 95 S contains two mixing chambers used
to mix the concentrate with the water and
separate air from the dialysis fluid before enter-
ing the conductivity cell.

Deairating chamber

The deairating chamber comprises a level
detector and the dialysis fluid pressure trans-
ducer. The level detector interfaces to the FM I/
O board, via a cable. The pressure transducer is
connected to a pressure transducer board, via a
twisted cable. The pressure transducer board
interfaces directly to the FM I/O board.

Flow pump unit

The flow pump unit consists of the following:
• Gearwheel pump driven by a DC-
motor.
• Pressure transducer with board. The
pressure transducer is connected to the
transducer board, via a twisted cable. The
transducer board interfaces directly to the
FM I/O board, via a board connector.
2:14

Dialyzer connections

The input tube nipple is fitted with a particle
filter.

Safety coupling unit

The safety coupling unit comprises two tube
connections, which are used when the machine
is to be disinfected, and a pressostate SAGS,
which detects when the tubes are disconnected
from the safety coupling.
The AK 95 S is also equipped with a pair of
mechanical switches that sense if the dia connec-
tors are attached to the bypass block.

UF measuring unit

The UF measuring unit consists of the following
components:
• Measuring cell.
• UF amplifier board.
• UF driver board.
The boards are mounted on each side of the
measuring cell. The UF measuring unit inter-
faces to the Control Driver, via the UF amplifier
board, a board connector and a flat cable.

FM I/O board

The FM I/O board contains of 6 connectors to
pressure transducers and temp. transducers. It
also contains the running time meter.

Heater unit

The heater is connected to the relay board, via a
cable. It comprises a temperaturetransducer
T . The transducer is connected to a transducer
Reg
board, via a twisted cable. The transducer board
interfaces directly to the
FM I/O board, via a board connector.
NOTE! If the heater cartridge has been over-
heated, this must be exchanged and the leakage
current to earth measured before restart.
Flow Switch
A mechanical flow switch is mounted before the
heater. The flow switch will turn off the heater
in a no-flow situation.
AK 95 / AK 95 S Service Manual
HCEN 9134 Rev. 10.2005