Shearwater Petrel EXT, Operation Manual, Page: 45 / 65

Shearwater Petrel
Revision 1.1.0 45 Shearwater Research Inc.
If we now unplug sensor 1 and sensor 3, the computer will use
voting logic to pick the two sensors that agree and will think the
PPO2 is 0. Sensor 2 will be voted out and flashing yellow � This is a
limitation of voting logic, and the user will have to determine which
sensors are correct�
With sensors one and three unplugged, we simulate the situation
of single sensor monitoring� If we calibrate in this situation, the
system will assume that this computer is only attached to one
sensor, and will re-configure for fourth sensor monitoring.
It will no longer average the sensors or vote on them� Now the
single sensor is the only one considered and the PPO2 used for
calculations is the PPO2 of the single sensor�
Brightness
The display brightness has three fixed brightness settings plus an
Auto mode�
The fixed options are:
• Low: Longest battery life�
• Med: Best mix of battery life and readability�
• High: Easiest readability, especially in bright sunlight�
Auto will use the light sensor to determine the brightness of the
display� The more ambient light there is, the brighter the display will
get� At depth, or in dark water, very little brightness is needed to
see the display�
The Auto setting works well in most situations�
The brightness of the display is the major determinant of battery
life� Up to 80% of the power consumption is to power the
display� When a low battery alert occurs, the display brightness is
automatically reduced to extend battery life�
DEPTH TIME STOP TIME
.97
O2/HE NDL TTS
CC 21/OO O O
O
DEPTH TIME STOP TIME
.97
DilPO2 CNS AvgPO2
.21 O .97
O
DEPTH TIME STOP TIME
Exit Edit
O
Brightness Auto
.85 .86 .84