Changing FiO
2
During Ventilation Using a Compatible Ventilator
User Manual 5-7
DMR V4C 3.3 (User Manual) V-4 06-May-2022
5.2 Changing FiO
2
During Ventilation Using a Compatible Ven-
tilator
WARNING:
If using the V4C-560 FiO
2
kit, changes in the ventilator’s settings or mode may affect the
calibration of the sensor. For the most accurate FiO
2
readings, recalibrate the sensor after any
significant changes to the ventilator settings. If recalibrating follow the directions in Section 5.1,
FiO
2
Sensor Calibration.
1. During ventilation, gradually turn the O
2
knob clockwise to increase the FiO
2
or counterclockwise to
decrease the FiO
2
.
Caution:
Turning the knob with excess force past the usable limit may damage the V4C-O2E Oxygen
Mixer. Stop turning when resistance is felt.
Note:
The two extremes of the knob position may yield little to no FiO
2
changes, while the centre of the knob
will have the highest sensitivity to change. This is normal behaviour. For further information see
Section 8, Theory of Operation.
Note:
In normal operation, there may be resistance when adjusting the oxygen knob from its maximum or
minimum position and an audible sound or clicking may occur. For more information on the
functioning of the knob see Section 8, Theory of Operation.
2. Monitor the FiO
2
on the compatible ventilator. Stop at the desired FiO
2
.
Note:
It may take a few breaths after FiO
2
adjustment for the FiO
2
reading to settle. Wait for a few breaths
before adjusting further.
3. Adjust the High and Low FiO
2
alarms to reflect the new FiO
2
percentage. It is recommended to set the
alarms within 5% of the required FiO
2
. Consult the instructions of the compatible ventilator or the FiO
2
sensor to set and adjust these alarms.
Caution:
The FiO
2
delivered is dependent on the breath settings. When the settings are changed (either
manually or due to a change in patient status), the FiO
2
may change. For this reason,
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