5.10 Alarm System Test
WARNING
The anaesthetic machine must not be used if any alarm
is not functioning correctly.
Primary Oxygen Failure Alarm
The machine is fitted with a warning whistle and a
visual indicator (1).
These components act as oxygen supply failure
devices and constitute the primary alarm system,
powered only by the residual oxygen supply, as
described in section 3.
The system can be checked whenever the low
pressure oxygen system is first pressurised by
turning on a cylinder or connecting a pipeline.
a) The whistle will sound briefly as pressure
increases, and,
b) The visual indicator will turn from red to green.
Whistle, Visual Indicator, and Gas Cut-off Device
Test
A formal test (including the action of the internal gas
cut-off device) is performed as follows:
1. Connect oxygen, nitrous oxide and air supplies.
2. Set the Gas Delivery switch (2) to ON, and
check that the warning whistle sounds briefly.
3. Set a flow of 2 L/min on both flowmeters.
4. Disconnect the oxygen supply at the wall socket
or close the oxygen cylinder valve and check:
a) that as the oxygen flow slows down, the
whistle starts to sound and continues for at least
7 seconds.
b) that the flow of nitrous oxide is cut off
completely before the oxygen flowmeter shows
zero flow.
c) that the visual indicator (1) turns red before
the oxygen flow is entirely stopped.
d) air continues to flow.
NOTE.
All gases must be included in the pre-use check.
5. Reinstate the oxygen supply.
Check that the flow of nitrous oxide is
reinstated, and that the visual indicator turns
green again.
PRE-USE CHECKS
2
30
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