Document No. 715-7000
Revision E
Page 31 of 63
Alarms
The AeroNOx
unit has adjustable alarm limits for NO & NO
2
. Audible and visual alarms are
activated at the value that is set by the user, with the exception of the NO
2
high alarm setting
which can manually be adjusted to 99 ppm, but has a factory set default alarm of 11 ppm should
the user set the alarm at 11 or higher. By carefully choosing alarm limits, any deviations in NO
or NO
2
concentrations will be known as soon as possible.
CAUTION!
There are no alarms for the oxygen analysis portion of the AeroNOx
.
An auxiliary oxygen analyzer, such as the MiniOX
3000 by MSA, with
audible and visual alarms must be used in conjunction with the
AeroNOx
.
Safety Shut Off
For patient safety, the AeroNOx
has incorporated a “safety” shut-off system for the delivery of
NO gas. The system is designed to avoid inadvertent high doses of NO being delivered to the
patient by terminating the flow of NO gas to the delivery line. The system is activated when the
NO dose analyzed is 5 ppm above that which has been set as the high NO alarm (or 100 ppm
whichever is the lesser value) and 1 ppm above that set for the high NO
2
alarm (or 12 ppm
whichever is the lesser value). The system is designed to restore the flow of gas to the delivery
line once the analyzed NO and/or NO
2
values drop back to below the 5 ppm above and 1 ppm
above alarm values. The default setting for this alarm is “activated”, that is, no action is required
by the user to enable the safety system. To verify that the system is activated, simultaneously
depress the NO and NO
2
alarm silence buttons. The display will read “SAFETY ON”.
Do not
depress the alarm silence buttons for more than 4 seconds as this will disable the
“safety” shut-off system!
Should the “safety” shut-off system be triggered, (that is, an alarm condition has occurred) there
will be an audible as well as a visual alarm, and the display will alternately read “NITRIC OFF”
and the sensor data.
Your patient will not receive any NO gas from the AeroNOx
system during this
condition!
It is recommended that you manually ventilate your patient with a system such as the INOstat
Kit, capable of delivering a safe and known concentration of NO to your patient, while you
troubleshoot the system to determine why the “safety” shut-off system was triggered. For
information on the INOstat
Kit back-up delivery system, see
SECTION III, Back-Up System
.
To override the system, simultaneously depress the alarm silence buttons for 5 seconds. The
display will read “SAFETY ON” until 5 seconds have elapsed at which time it will read “SAFETY
OFF”. At this point, the “safety” shut-off system has been inactivated. During the time that this
system remains inactivated, the display will alternately display the “SAFETY OFF” message and
the sensor data. To restore the “safety” shut-off to the activated mode, you may either
simultaneously depress the alarm silence buttons for 5 seconds, or you may power the machine
off and then back on again.