A7â„¢ Service Manual 046-006272-00 3 - 45
Periodic Maintenance Alarms and Fail safe Functions
3.12.2 Low O2 Alarm Test
NOTE: For A7s with an installed gas module, disconnect the sample tube from
the Y-piece and breath into it until you see a CO2 reading on the screen.
Then reconnect the sample tube to the Y-piece. This will activate the
gas module alarms.
1. Set the low Insp O2 alarm limit to 50%.
2. Set the air flow to 5 L/min.
3. Set the O2 flow to 0 L/min.
4. Verify the following low Insp O2 alarm signals activate, within three ventilation cycles:
• FiO2 Too Low message appears on the screen.
• An alarm tone sounds.
5. Set the low Insp O2 alarm limit to 18%.
6. Verify the FiO2 Too Low message disappears
3.12.3 High O2 Alarm Test
1. Set the high Insp O2 alarm limit to 50%.
2. Set the O2 flow to 5 L/min.
3. Set the air flow to 0 L/min.
4. Verify the following high Insp O2 alarm signals activate:
• FiO2 Too High message appears on the screen.
• An alarm tone sounds.
5. Set the high Insp O2 alarm limit to the highest setting.
6. Verify the FiO2 Too High message disappears.
3.12.4 Peak Pressure Alarms Test
1. Set the PEAK low alarm limit to the lowest setting.
2. Set the PEAK high alarm limit set point about 5 to 8 digits below the Peak Pressure displayed on
the screen.
3. Verify the following (high) peak pressure alarms activate:
a. Paw Too High message appears on the screen.
b. An alarm tone sounds.
c. Inspiration ends and expiration begins as the pressure meets the high alarm limit.
4. Set the PEAK high alarm limit to the highest setting.
5. Verify the Paw Too High message disappears.
6. Set the PEAK low alarm limit to 70 (cmH2O).
7. Verify the following (low) peak pressure alarms activate:
a. Paw Too Low message appears on the screen.
b. An alarm tone sounds.
8. Set the PEAK low alarm limit to the lowest setting.
9. Verify the Paw Too Low message disappears.
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