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10. Alarms
Warning Audible and Visual warning alarms indicate a potentially harmful
condition to the patient . Failure to take corrective action could result in injury
or death to the patient.
10.0.1 Microprocessor
The microprocessor system failure and other electronic circuitry failures are
alarmed as follows.
The microprocessor carries out a self check every 20 ms, and should a failure be
detected the
'SYSTEM FAIL'
LED will start to flash and the processor will attempt
to reset itself. There is a secondary watchdog alarm independent of the above
system which is reset by the main processor every 20 ms. Should the processor
fail to reset this watchdog within 3 seconds then a HIGH FREQUENCY alarm will
pulse at 2 Hz. This alarm can only be cancelled by switching the ventilator off.
Other hardware system checks are incorporated such as the
monitoring of the solenoid driver circuitry. If the solenoid driver
fails to operate when the processor has initiated a solenoid valve
closure or opening, 'SOL' will appear in the
BPM
display window.
All the front panel potentiometers are frequently checked for
continuity. If a defect is found then, '
HELP
' appears in the l:E
ratio display window and the solenoid is de-energised.
Further checks are made on the processor associated hardware, and again if any
fault is detected the solenoid is de-energised and
‘HELP’
is displayed in the l:E
ratio display window.
10.0.2 Mains Failure Audible Alarm
Active when the mode switch is in any position except
OFF
and will alarm if mains
voltage supply fails.
10.0.3 Gas Supply Failure Alarm
The Air and Oxygen audible alarms are an integral part of the blender, and function
when AIR or O
2
pressures differ by more than 30 PSI and if either gas is
disconnected.
Summary of Contents for 2000
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