14
SYMBOLS AND ALPHA NUMERIC GRAPHICS
The upper line of digits on the LCD screen is used to convey
alpha Messages such as Day of the Week, Operating Modes,
items being Set, Gas and Transmitter identification, Altitude level,
and Alarm identification. At times, the second line is also used to
display alpha numeric graphics such as PO2 and On/Off. See
Figure 3. The FO2 setting of Air will appear in the lower line.
Symbols that appear on the various displays are described
throughout this manual and summarized on page 86.
AUDIBLE ALARM
When warning situations activate the Audible Alarm, the ATOM
will emit 1 beep per second for 10 seconds, or until the situation
is corrected, or it is acknowledged by momentarily pressing and
releasing the S button (< 2 seconds). After being acknowledged
and the situation corrected, the Alarm will sound again upon
reentry into the warning situation, or entry into another type of
warning situation.
A red LED Warning Light, located on the left side of the housing,
is synchronized with the Audible Alarm. It will flash as the
Audible Alarm sounds. It will turn off when the Alarm is acknowl-
edged or the situation is corrected. The Audible and LED will not
be active if the Alarm is Set OFF (a group A setting).
Fig. 3 - Sample Messages