Siemens Servo i, Service Manual, Page: 48 / 70

Siemens-Elema AB
Troubleshooting Servo …
E382 E407E 061 01 01 02 6 - 4
6
Internal leakage test Checks the internal leakage, with test
tube connected, using the inspiratory
and expiratory pressure transducers.
Checks that the leakage is less than 11
ml/min at 80 cm H
2
O.
Checks that the measured pressure
values differs less than 5 cm H
2
O
between insp. and exp.
(BRE)
If message ”Leakage” or ”Excessive
leakage” appears:
1. Check that the test tube is correctly
connected.
2. Check the expiratory cassette:
Check that the expiratory valve
membrane is correctly seated in
the cassette.
Check that the cassette is correctly
seated in the cassette compart-
ment. If possible, replace the
expiratory cassette and check if the
new cassette is accepted by the
Pre-use check.
3. 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.
Check that the safety valve closes
properly when the Pre-use check is
started (distinct clicking sound from
the valve)
4. Check that the pressure transducer
tubes/filter are correctly mounted.
5. Clean the expiratory cassette and
the inspiratory pipe, in order to
remove possible dirt particles on
the membrane.
If message ”Pressure Transducer
difference > 5 cm H
2
O” appears:
1. Check the test tube.
2. Check that the pressure transducer
tubes/filter are correctly mounted.
3. If the Pressure transducer test also
fails (see below), check the
pressure transducers (Insp. and
Exp.).