Fresenius Medical Care 2008k Technical Manual page 24

Definition of component function
x2. Temperature control thermistor (CON-NTC)
Controls temperature in the heater chamber.
x3. Temperature monitor thermistor (MON-NTC)
Monitors temperature in the conductivity cell block, bypass is initiated when temperature
is out of limits.
x4. Not Used
x5. Level sensor (float) in hydroblock (FLOAT-SW)
Controls water inlet valve 41 and it's signal is used to detect flow problems.
x6. Air sensor in air separator chamber (AIR-SEN)
Detects air coming from the dialyzer and is used to trigger the fill mode.
x7. Conductivity cell (COND)
Monitors the conductivity before the dialyzer, bypass is initiated when conductivity is out
of limits.
x8. Blood leak detector (BLOOD LEAK)
Detects blood in the return line of the dialyzer and triggers the minor blood leak warning
and the blood leak alarm.
x9. Dialysate pressure transducer (P-DIAL)
Measures the dialysate pressure. This value is used to calculate the TMP.
x10. Chamber full switch (CFS)
The pressure spike seen by this transducer is used to switch the balance chamber. The
time between pulses and the selected flow rate will set the voltage to the flow pump. It is
intended to limit the height of the pressure spike to a certain value (a little higher than the
loading pressure at all pump speeds).
x11. Reed switch for concentrate connector (CONC-SW)
Disables the concentrate pump.
x12. Reed switch for bicarbonate connector (BIC-SW)
Disables the bicarbonate pump.
2008K Technician's Manual
DISTRIBUTION BOARD LAYOUT
Section III – Hydraulic Description
III-7