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10.0.4 Fresh Gas Fail Alarm (Block & Leak)
This fresh gas failure system will detect either a blockage or a leak in the Fresh Gas
supply line. To achieve this there is a small restrictor fitted in the Inspiratory Port of
the patient circuit, creating a pressure in the alarm circuitry to the Electronics
Module. Should the Fresh Gas supply to the patient fail, visual and audible alarms
will activate. The Fresh Gas LEAK LED will illuminate and the audible alarms will
operate. This alarm will reset when the gas flow is restored. Similarly the Fresh
Gas BLOCK LED will illuminate and the alarm will sound, should there be a
blockage in the patient gas supply, and a high pressure relief valve will be
activated.
10.0.5 Adjustable Alarm
Two controls on the front panel control the settings for HIGH/CYCLE FAIL and
LOW alarms.
10.0.6 High Alarm
Should the airway pressure exceed the PIP alarm setting by more than 4 cms,
audible and visual alarms will be activated, a system leak will be introduced to vent
excessive pressure and the fresh gas supply will be cut off. HIGH pressure alarms
can only be cleared and fresh gas returned by reducing airway pressure then
pressing the RESET button.
10.0.7 CYCLE FAIL ALARM
This alarm will be activated should the pressure wave fail to pass through a
threshold 4 cms below the PIP setting on either inspiration or expiration, indicating
a drop in airway pressure, a leak or circuit blockage. The audible alarm will reset
automatically on correct pressure being restored but the visual alarm must be
RESET by pressing the reset button.
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