Breathing System Checks Periodic Maintenance
3 - 40 046-006272-00 A7â„¢ Service Manual
10. et the balance gas to AIR.
11. Set the O2 flow to 0 L/min.
12. Rotate the air flow control knob to set the air flow following the table below, then verify the air
flow reading of the flow analyzer.
3.10.3 Drive Gas Pressure Loss Alarm, N2O Cutoff Test
1. Close and remove all gas cylinders from the anesthesia system.
2. Connect the O2 and N2O line pressure hose to the anesthesia system from the wall supply.
Leave all other line pressure hoses disconnected.
3. Turn the unit on and set the A7 in EFCS mode and set the N2O as balance gas.
4. Set the O2 flow to 2 L/min using the flow control valve.
5. Set the N2O flow to 2 L/min using the flow control valve.
6. Interrupt the O2 supply to the anesthesia system.
7. Verify that the flow of N2O and O2 stops within 2 minutes.
8. Verify the following alarms are activated:
• O2 Supply Failure appears on the screen.
• An alarm tone sounds.
9. Reconnect the O2 supply and disconnect the N2O line pressure hose
10. Verify the following alarms are activated:
• N2O Supply Failure appears on the screen.
• An alarm tone sounds.
11. Connect the AIR line pressure hose to the anesthesia system and set the AIR as balance gas.
12. Set the O2 flow to 2 L/min using the flow control valve.
13. Set the AIR flow to 2 L/min using the flow control valve.
14. Interrupt the AIR supply to the anesthesia system.
15. Verify the following alarm is activated:
Test Method Verification (Flow analyzer flow rate)
Set the O2 flow to 0.2 L/min. Verify O2 flow is between 150 mL/min and 250 mL/min.
Set the O2 flow to 1 L/min. Verify O2 flow is between 950 mL/min and 1050 mL/min.
Set the O2 flow to 3 L/min. Verify O2 flow is between 2850 mL/min and 3150 mL/min.
Set the O2 flow to 10 L/min. Verify O2 flow is between 9500 mL/min and 10500 mL/min.
Set the O2 flow to 15 L/min. Verify O2 flow is between 14250 mL/min and 15750 mL/min.
Test Method Verification (Flow analyzer flow rate)
Set the air flow to 0.2 L/min. Verify air flow is between 150 mL/min and 250 mL/min.
Set the air flow to 1 L/min. Verify air flow is between 950 mL/min and 1050 mL/min.
Set the air flow to 3 L/min. Verify air flow is between 2850 mL/min and 3150 mL/min.
Set the air flow to 10 L/min. Verify air flow is between 9500 mL/min and 10500 mL/min.
Set the air flow to 15 L/min. Verify air flow is between 14250 mL/min and 15750 mL/min.
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