A7™ Service Manual 046-006272-00 2 - 35
Installation Guide Pneumatic Leak Tests
2.4 Pneumatic Leak Tests
Turn all fresh gas flows to 0 L/min.
2.4.1 Line Pressure Gauges Accuracy Test
1. Open the rear panel and disconnect the pipe supply for all 3 gases (O2, AIR and N2O).
2. Disconnect hose # 47 from the regulator assembly and connect it to your high pressure meter.
3. Reconnect the O2 Pipeline supply.
4. Verify the reading on your pressure meter and the reading on the O2 pipeline pressure gauge
are within 5 psi of each other.
5. Disconnect the O2 Pipeline supply and reconnect hose # 47 to the regulator assembly.
6. Disconnect hose # 37 from the regulator assembly and connect it to your high pressure meter.
7. Reconnect the AIR Pipeline supply.
8. Verify the reading on your pressure meter and the reading on the AIR pipeline pressure gauge
are within 5 psi of each other.
9. Disconnect the AIR Pipeline supply and reconnect hose # 37 to the regulator assembly.
10. Disconnect hose # 35 from the regulator assembly and connect it to your high pressure meter.
11. Reconnect the N2O Pipeline supply.
12. Verify the reading on your pressure meter and the reading on the N2O pipeline pressure gauge
are within 5 psi of each other.
13. Disconnect the N2O Pipeline supply and reconnect hose # 35 to the regulator assembly.
14. Reconnect the pipe supply for all 3 gases (O2, AIR and N2O).
2.4.2 N2O Cylinder Leak Test
1. Remove the N2O line pressure hose from the line pressure inlet on the A7.
2. Mount a full N2O cylinder to the rear panel yoke. If necessary, place a new clean tank washer
between the cylinder and the yoke to minimize any leaks at the yoke connection.
3. Open the N2O cylinder until its pressure gauge indicates cylinder pressure.
4. Close the N2O cylinder.
The N2O cylinder pressure gauge should not drop more than 10% of its initial pressure over 1 minute.
2.4.3 O2 Cylinder Leak Test
1. Remove the O2 line pressure hose from the line pressure inlet on the anesthesia system.
2. Mount a full O2 cylinder to the rear panel yoke. If necessary, place a new clean tank washer
between the cylinder and the yoke to minimize any leaks at the yoke connection.
3. Open the O2 cylinder until its pressure gauge indicates cylinder pressure.
4. Close the O2 cylinder.
The O2 cylinder pressure gauge should not drop more than 10% of its initial pressure over 1 minute.
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