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Revision NEW
APECS™ 2.7
7 of 19
Date: 10 July 2008
APECS
™ OPERATIONAL
INSTRUCTIONS (v. 2.7)
elevations and or
lower temperatures.
It is a prudent habit to record the sensor mv at various set
points during the dive and to do comparison check on later dives.
TEMPERATURE:
The temperature sensors monitor the ambient water or air
temperature and the breathing loop temperature on the primary handset and the
loop temperature only on the secondary handset.
BL ENBL/DISBL:
The back light may be disabled at any time by the diver and
maintain that setting for as long as the diver wishes. To disable the backlight the
diver must access the option to
BL ENBL/DISBL
and push the menu button to
ENABLE
or
DISABLE
and push the
CONFIRM
button to lock in the selection
.
NOTE: The back light low battery indicator will also be disabled if the BL
DISBL option is selected.
KEEP BACKLITE ON:
This option will force the back light to remain illuminated
continuously while the system is powered on. It is ignored in the event of a low
battery condition as described above and if the option is enabled the
DISPLAY
POWERSAVE
option will be ignored.
This options defaults to disabled anytime
the system power is cycled.
DISPLAY POWERSAVE:
When enabled under normal operating conditions
(
KEEP BACKLITE ON / DISABLED
) the handset unit will “go blank” after ten
minutes of inactivity (no button pushes), this has no effect on the CPU or
solenoid operation. This option is ignored if
KEEP BACKLITE ON
is set to
ENABLE
.
With the above three options the diver has great flexibility with which to manage
power and handset readability.
OXY INJECT:
The
OXY INJECT
setting is the means to adjust the oxygen
injection by setting the timeout intervals. The possible “off time” (duration of time
the solenoid will not “fire”) settings are 4,5,6,7 and 8 seconds. The purpose of
controlling the required off time between solenoid “firing” is to allow time for the
oxygen in the loop to homogenize to help avoid spikes in PO2 and to facilitate
the operation of the Adaptive Injection Algorithm. The duration of time the
solenoid is permitted to “fire” is controlled by the Adaptive Injection Algorithm
(AIA). The Adaptive Injection Algorithm monitors the current PO2 and adjusts
the permitted “firing” time to maintain the desired set point as determined by ASP
(current set point on descent) or set via the
CHANGE SP
menu. The permitted
solenoid “firing” durations range between a .25 second and 4 seconds depending
on the rate of response of current PO2 vs. desired PO2.
