5.2.3 Flowmeters
1. Turn on the Gas Delivery switch (1) and
check that the warning whistle sounds
briefly briefly, and that the correct basal
flow of oxygen is delivered (see section 4).
2. Open the nitrous oxide flowmeter needle
valve and check that there is no nitrous
oxide flow.
3. Operate the oxygen flowmeter needle
valve.
Check that full scale of flow of oxygen and
nitrous oxide can be achieved, and that
the floats in both tubes move freely and
rotate when at a steady flow.
4. Check that the nitrous oxide flow can be
turned off by gentle rotation of the oxygen
knob.
Check also that the nitrous oxide float
reseats on the bottom stop, and that the
oxygen basal flow continues to flow.
5. Operate the other flowmeter control knobs
in turn to check:
the full scale of flow can be obtained;
the floats move freely and rotate at a
steady flow;
the flow can be turned off by gentle
rotation of the knob; and that
the floats reseat on the bottom stop.
6. Dual cascade flow tubes:
Check that gas flow is through the low flow
tube initially until full flow is achieved, then
through the high flow tube.
7. Auxiliary flowmeter (2)
Rotate the flowmeter control and check
that a gas flow can be obtained.
22
PRE-USE CHECKS
1
2
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