28 Prima 451 – User Manual
Installation and Pre-use Checks
5.10 Alarm System
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Do not use the
anaesthetic
machine if any a
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monitoring, or protection system devices are
not
functioning c
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.
Primary Oxygen Failure
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A warning whistle and a visual indicator (1) act as oxygen
supply failure devices, and constitute the primary alarm
system, powered only by the residual oxygen supply, see
section 3.3
Check the system when the low pressure oxygen system is
first pressurised by turning on a cylinder or connecting a
pipeline.
The whistle will sound briefly as pressure increases, and the
visual indicator (1) will turn from red to green.
Whistle, Visual
Indicator,
and Gas Cut-off De
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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. Set a flow of 2 L/
min on both flowmeters.
3. 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) That air, if fitted, continues to flow.
NOTE All gases must be included in the pre-use check.
4. Reinstate the oxygen supply.
Check that the flow of nitrous oxide is reinstated, and that
the visual indicator turns green again.
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