VIII. MAINTENANCE AND SERVICE- CONT.
48
NOTE: If TV is not displayed under the RATE key, then go into SETUP, press TV/INSP and
select Tidal Volume as the preferred parameter.
ALARM MENUS
Exceed each limit, HIGH and LOW, in the menu and verify the ventilator alarms.
SIMV FUNCTIONS (SET TO SIMV MODE)
FLOW TRIGGER
Connect an infant circuit with a pneumotach and test lung to the Crossvent.
Set the Rate to 10, TV to 50 and Flow to 5 LPM.
Set the Flow Trigger Level to 1. If the unit auto-cycles, increase the FLOW TRIGGER setting until it stops.
While in expiratory, lightly squeeze and release the test lung. The unit should cycle and ASSIST should appear in the
Inspiratory window in the lower left of the display.
Increase the level again and repeat. It should require slightly more effort this time to make the unit cycle.
CONSTANT FLOW MODE
Turn on Constant Flow Mode and verify flow remains ON. Turn OFF when done.
SIMV BACKUP RATE
Turn ON the Crossvent.
Connect the unit to a Rate Test Standard.
With the SIMV RATE set to 20 and without initiating a breath with effort, verify the unit delivers controlled breaths at the
set rate.
PRESSURE SUPPORT
Set PRESSURE SUPPORT to 10 cmH
2
O and initiate breaths using inspiratory effort. Verify that the high-pressure signal to
the exhalation valve is terminated when the circuit pressure equals 10 cmH
2
O above PEEP during spontaneous breaths only,
and that the gas flow remains on for the duration of the set inspiratory time.
CPAP FUNCTIONS (SET TO CPAP MODE)
MANUAL
Press the MANUAL key and verify a pressurized breath is delivered and MAN is displayed in the lower left key during this
breath.
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