External flow source
When a constant external flow of up to 12 L/min is
supplied (e.g. during medicament nebulisation with
separate gas supply and not from Evita 4 or during
separate tracheal gas insufflation), this flow can be
calculated by Evita 4 and the tolerance increased for the
monitoring parameters of the flow sensor in order to
avoid generation of the alarms "Flow measurement inop."
and "Neo. flow meas. inop." (NeoFlow option) during
these applications.
The originally measured expiratory volume is maintained:
During an expiratory flow, Evita 4 measures a
correspondingly higher value for VTe and MV.
To avoid alarms:
● Adjust upper limit for MV.
For initial calculation of the external flow:
● Start external flow.
● Press the »Calibration« key.
● Touch the »Flow« screen key.
● Touch the »extern. Flow« screen key.
● Touch the »Measure« screen key.
Confirm = press rotary knob.
● Yellow LED in »Measure« key lights up.
Evita 4 calculates the external flow.
The following message is displayed on Evita 4 during this
time:
External flow is being measured...
When the external flow has been calculated, it is
displayed by Evita 4 with the time and date.
The following prompt is also displayed on Evita 4:
Confirm value with
● Confirm = press rotary knob.
Calculation of the external flow is interrupted by Evita 4 if
it is greater than 12 L/min or the flow measurement
function is defective.
Once the external flow has been calculated successfully,
it is taken into account automatically:
The yellow LED in the »On« key lights up.
The advisory message
External flow!
is displayed as long as the external flow is taken into
account by Evita 4.
If an external flow is not applied:
● Switch off: touch the »Off« key.
Confirm = press rotary knob.
Once the value of the external flow has been calculated
by Evita 4, its inclusion can be reactivated at any time:
● Touch the »On« screen key.
Confirm = press rotary knob.
If the external flow changes:
●Press the »Measure« key and the external flow is
redetermined by Evita 4.
99
Operation
External flow source
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