A7™ Service Manual 046-006272-00 3 - 33
Periodic Maintenance Pneumatic Leak Tests
3.8.9 Total Flow Sensor Self Test
NOTE: Perform this test after sensor calibration if the total flow sensor is
replaced.
1. Turn on the O2 and N2O supplies, and ensure that O2 and N2O are within the normal input
pressure range.
2. If the system has been powered on and N2O has been adjusted, power off and then on the
system to ensure that the system is in the initial startup state.
3. Set the system to enter the EFCS mode and set the balance gas to N2O.
4. Adjust the N2O flow to a value (for example, 2 L/min) and retain this value for more than 2
seconds. The N2O flow must not be set to zero in this period.
5. A message "Total Flow Sensor Self Test in Progress" is displayed on the main screen. After the self
test is successfully completed, the message disappears and the N2O flow reaches the set value
stably.
6. If the self test failed, the BFCS is displayed and an alarm "Electronic Flow Control Error" is
reported.
3.9 Pneumatic Leak Tests
Turn all fresh gas flows to 0 L/min. Disconnect pipeline supplies.
3.9.1 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).
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