Blease Sirius 1000, Manual, Page: 52 / 107

51 First Line and Planned Maintenance Manual
Frontline Sirius®
3. Full System Testing
3.1.2 On/Off Switch and Warning System Checks
1. Switch on the machine.
2. If the oxygen supply failure alarm operates for more than a few seconds, check that oxygen
supply cylinders or pipeline are correctly installed and at the correct pressure.
3. The machine is fitted with a mechanical hypoxic guard, check that there is a standing flow of
130 to 170 ml/m through the oxygen flowblock assembly with the oxygen flow control
turned fully clockwise.
4. Increase the oxygen flow to approximately 4 l/m.
5. Turn all the flow control valves counter-clockwise so that the flow indicated by each flow
tube assembly is 1 l/m.
6. Simulate an oxygen supply failure by shutting off or disconnecting the oxygen supply
cylinder(s) or pipeline(s).
7. Check that the oxygen failure warning device is activated after the pressure of the oxygen
remaining in the machine has fallen, ensuring that:
• Its whistle sounds for at least 8 seconds;
• All the other gases on the machine are cut off with the exception of Air if fitted (I.e. the
readings on their flowblock assemblies indicate zero).
8. Reconnect the oxygen supply and check that:
• The oxygen failures alarm is cancelled;
• The gas flows through the flowblock assemblies are restored.
9. Disconnect or shut off the nitrous oxide supply (cylinder and/or pipeline) and check that:
• The flow indicated in the nitrous oxide flowblock assembly reduces to zero;
• The flows indicated on the other flowblock assemblies remain unaltered.
10. Reconnect or turn on the nitrous oxide supply.
11. Repeat 9 and 10 for all the other gas supplies on the machine.