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Revision NEW APECS™ 2.7 10 of 19
Date: 10 July 2008
APECS ™ OPERATIONAL
INSTRUCTIONS (v. 2.7)
HUD Operation
The HUD is only available on the secondary hand set system of a dual APECS
system or on the Primay handset on a Shearwater configuration; it displays the 3
individual sensors by color and number of blinks. The diver may at any time turn
off the HUD especially after the dive to save battery power and may turn it back
on at any time.
Note: If the HUD is disabled and the PO2 falls below .5 the HUD will
automatically enable until such time as the PO2 rises above .5 at which time it
will automatically disable.
The HUD brightness may also be adjusted to bright and dim. The dim may be
used for when there is no ambient light and the bright may be too bright. The
dim does not save any more power as the bright; in fact it uses more power.
The HUD is a powerful indicator to you and your buddy or student, at any time
the buddy/instructor can see what you/buddy/student are breathing and the
condition of each sensor by looking at the color and number of blinks.
The following is a brief explanation of the HUD color and number system (single
LED HUD).
Color PO2 Blinks Condition
Red <0.50
Rapid Blink
Preliminary alert to a HYPOXIC loop.
Red
0.5 5 Short Ambient air.
Red
0.6 4 Short
Red
0.7 3 Short
Red
0.9 1 Short
Orange
1.0 1 Short Post calibration on O2
Green
1.1 1 Short
Green
1.2 2 Short
Green
1.3 3 Short
Green
1.4 4 Short
Green >1.5
Rapid Blink
Preliminary alert to HYPEROXIC loop.
Example: During the dive the diver has a set point of 1.2, the diver will observe
the following on the HUD, Sensor 1, green blink blink, pause, Sensor 2, green
blink blink, pause, Sensor 3, green blink blink, long pause and back to Sensor
one again.
Note: The system is very simple and is more complex to explain then to interpret.
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