Blease Sirius 1000, Manual, Page: 77 / 107

76 First Line and Planned Maintenance Manual
Frontline Sirius®
Note that the oxygen failure warning device may momentarily activate when
the oxygen is first turned off. Allow 15 seconds for the reservoir to fill.
N2O cylinder gauges do not have division markings. Check that the gauge
pointer does not fall the equivalent distance in three minutes.
6.6 Hypoxic Guard
• With oxygen and nitrous oxide connected to the machine switch to the N2O position.
• Turn the oxygen flow rate to 10lpm, return it to 4lpm to calibrate an oxygen analyser.
• Check that the basal flow is between 0.15 ± 0.02lpm and that the bobbins revolve.
• Attempt to create a hypoxic mix (oxygen concentration less than 21%).
• If hypoxic mixture can be produced then this constitutes a failure.
Flow Control Valve
• Turn each flow control valve fully counter clockwise in turn, checking that the torque
required to turn remains constant without any sudden changes in its ‘feel’.
• Check that the maximum flow reading on the flowmeter can be obtained.
• Turn the flow control valve fully clockwise, checking that the torque required to turn remains
constant without any sudden changes in its ‘feel’.
• Check that the flow is zero for standard flow control valves, or 150ml ± 30ml for oxygen.
• Set the flow to approximately 25% of the flowmeter’s range.
• Check that an axial or lateral force does not change the flow by more than 10%.
• Release the knob and check that the flow returns to that set in 7.
Flowmeter Accuracy
• Turn all the flowmeter controls fully clockwise.
• Turn an oxygen cylinder or pipeline on.
• Connect a calibrated flowmeter to the common gas outlet of the machine.
• Turn the oxygen flow control counter clockwise to set the oxygen flow at the major
calibration points on the flowmeter as detailed in the calibration record (Checklist and
Calibration record).
• Using the calibrated flowmeter check that the gas flow from the common gas outlet is
within 10% of the combined flow indicated on the machine flowmeters.
• Turn the oxygen flow control fully clockwise.
• Repeat for all flowmeters on the machine.
6.7 Switch / Anti-confusion / Oxygen Monitor / Oxygen Failure/ Oxygen Flush
• Connect one source of each gas.
• Switch the machine to the N2O position.
• Check that there is a basal flow of 0.15 ± 0.02lpm through the oxygen flow meter with the
oxygen flow control turned fully clockwise.
• Increase the oxygen flow to 0.5lpm.
• Connect an oxygen analyser to the CGO - reading should be above 98%.
6. Planned Maintenance