Demand Function; Low Input Pressure Alarms; Low Input Pressure Shut Off; Oxygen Flush Key - O-Two eAdvantage User Manual

4.3.3. Demand Function

To test the Demand Function of the eAdvantage® mixer, apply a vacuum to the
patient connector. This vacuum should be equivalent to a fl ow rate of 30 L/min and
maintained for at least 1 second. The mixer is designed to respond by providing a
fl ow rate that matches this demand. Once the vacuum is removed from the patient
connector, the fl ow should stop.to that demanded. Remove the vacuum from the
patient connector; the fl ow from the patient connector should stop.

4.3.4. Low Input Pressure Alarms

Note: A complete test of this alarm function requires a supply regulator that
has an adjustable output pressure and a release valve. (Not supplied with the
eAdvantage® system). However, a basic check of the alarm function can be
performed by gradually closing the cylinder valve.
Start with the adjustable outlet pressure regulator set to an output pressure of 50 PSI.
Gradually decrease the outlet pressure to approximately 45 PSI, while simultaneously
and slowly releasing the gas from the device. Continue this procedure until the Low
Input Pressure Alarm, which includes both audible and visual alerts, is activated.

4.3.5. Low Input Pressure Shut OFF

Gradually decrease the oxygen regulator's outlet pressure. Aim for a target pressure
of approximately 20 PSI. Observe the device's response to this decrease in pressure.
It is designed to automatically shut OFF when the oxygen input pressure reaches
around 20 PSI.

4.3.6. Oxygen Flush key

When the eAdvantage® mixer is active and turned ON, press the Oxygen Flush key.
While doing so, keep an eye on the patient circuit to confi rm if oxygen begins to fl ow
continuously for the duration that the key is pressed.

4.3.7. Oxygen Concentration

To determine the oxygen concentration of the gas delivered by the eAdvantage®
mixer, follow these steps:
1- Attach an oxygen monitor to the mixer's output connection using a T-Connector.
2- Draw a total of 5 full breaths from the unit, each breath amounting to 1 Liter.
3- Observe the readings of the oxygen percentage.
4- Verify that the reading falls within +/- 5% V-V of the preset value.
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