Servo-i Ventilator System Troubleshooting
Revision 02 Service Manual 6 - 5
6
Test Test description * Recommended action if the test fails
Internal leakage test Checks the internal leakage, with test
tube connected, using the inspiratory
and expiratory pressure transducers.
Checks that the leakage at 80 cm H
2
O
is max. 10 ml/min.
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 cassette is
correctly seated in the cassette
compartment.
• If possible, replace the
expiratory cassette and check if
the new cassette is accepted by
the Pre-use check.
• If the new cassette was
accepted by the Pre-use check,
the fault was located to the
cassette. To repair the old
cassette, check that the
expiratory valve membrane is
clean and correctly seated in
the cassette. Replace the
membrane if required.
3. Check that the pressure transducer
tubes/filters are correctly mounted.
4. Check the inspiratory section:
• Check that the inspiratory pipe
is correctly mounted in the
inspiratory section.
• Check that the safety valve
membrane is clean and
correctly seated in the
inspiratory pipe.
• Check that the safety valve
closes properly when the Pre-
use check is started (distinct
clicking sound from the valve).
If the safety valve opens during
this test, the opening pressure
may not be correctly calibrated
(see ‘Safety valve test’ below).
Run the ’Safety valve test’ and
repeat the complete Pre-use
check.
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