Siemens Servo i, Service Manual, Page: 49 / 70

E382 E407E 061 01 01 02 Siemens-Elema AB
Servo … Troubleshooting
6 - 5
6
Pressure transducer
test Calibrates and checks the inspiratory
and expiratory pressure transducers.
The new zero value for the pressure
transducers may not differ more than
±6 hPa from factory calibration.
With the inspiratory pressure
transducers used as a reference, a new
gain factor is set for the expiratory
pressure transducer. The new gain
factor may not differ more than ±5%
from factory calibration.
During this test, the different
subsystems concerned are compared.
The difference between the
subsystems must not be more than ±1
cm H
2
O at 60 cm H
2
O.
(BRE + MON)
If the Internal leakage test passed (see
above), check/replace Insp. or Exp.
pressure transducer. To locate the
faulty pressure transducer, replace one
transducer at a time and re-run Pre-use
check (or pressure transducer test in
FSS).
Safety valve test Checks and if necessary adjusts the
opening pressure for the safety valve to
117 ±3 cm H
2
O.
Checks the hardware signals related to
the safety valve functions.
(BRE + MON)
1. Check the inspiratory section:
Check that the safety valve
membrane is correctly seated in
the inspiratory pipe.
Check that the inspiratory pipe is
correctly mounted in inspiratory
section.
2. Check that the safety valve closes
properly when the Pre-use check is
started (distinct clicking sound from
the valve).
3. Replace PC 1784 Expiratory
channel.
O
2
cell test Calibrates and checks the O
2
cell at
21% O
2
and 100% O
2
.
Checks if the O
2
cell is worn out.
As different gas mixtures are used
during this test, calibration and check of
O
2
cell will not be performed if one gas
is missing.
(BRE + MON)
1. Check that the connected gas
supply pressure (Air and O
2
) is
within the specified range.
2. Replace the O
2
cell.
3. Replace gas modules (Air and O
2
).
4. Replace PC 1771 Control.
5. Replace PC 1772 Monitoring.