Section 3
Daily Checkout
C. Close the cylinder supplies and deplete the pressure from
the system.
OFPD Verification
*15. Check the oxygen failure protection device. With all gases
available on the machine set to a flow of about 4 l/min, close the
oxygen supply by disconnecting the oxygen pipeline supply hose
and closing the oxygen cylinder(s). The flow of all other gases in-
dicated by their flowmeters must decrease in proportion to the
decrease in oxygen flow and eventually shut off.
ORC Verification
*16. Check the function of the ORC. With the nitrous oxide flow
control valve open to a flow of 10 l/min, vary the oxygen flow with
the oxygen flow control valve. The nitrous oxide flow indicated on
the nitrous oxide flowmeter must automatically vary in response
to the adjustment of the oxygen flow control valve.
The ORC must maintain a fresh gas oxygen/nitrous oxide flow
ratio of at least 25 ±4 % oxygen.
NOTE: When the nitrous oxide flow control valve is open
and oxygen is flowing at a minimum rate (150–200
ml/min), nitrous oxide flows at approximately 500
ml/min.
Oxygen Flush
Verification
*17. Check the oxygen flush:
A. Press the oxygen flush button and listen for an audible gas
flow sound, accompanied by a marked increase in oxygen
concentration in the breathing system.
B. Check the delivered oxygen concentration. Repeatedly
flush the patient breathing system by pressing the oxygen
flush button. Open the oxygen flow control valve to a flow
of 8 l/min and close the other flow control valves. The
oxygen measurement display area should indicate 97% to
100% oxygen concentration.
Fresh Gas
Verification
*18. Make sure all vaporizers are closed. Open the oxygen flow control
valve to an 8 l/min flow and close all other flow control valves.
Sniff the gas coming from the fresh gas common outlet. There
should be no noticeable odor.
Bain Circuit Adapter
Verification
*19. Verify that the inner tube of the Bain circuit is intact and not
occluded. First deliver a flow of oxygen to the Bain circuit
through the fresh gas hose. Then occlude the inner tube of the
Bain circuit. The oxygen flowmeter float should drop in response
to the occlusion.
3-5
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