Shearwater Petrel
Revision 1.1.0
31
Shearwater Research Inc.
Single Sensor Mode
A single external O2 sensor may be used�
To enter this mode, perform the calibration with only the middle sensor
connected�
The Petrel will see that only one sensor is connected, and
automatically switch to single sensor mode�
Calibration Problems
One sensor displays FAIL after calibration
This could indicate a bad sensor� It has failed because the mV output
was not in range� The sensor could be old or damaged, and should
be inspected� Damage and corrosion to wires or connectors is also a
common problem� Fix the problem and recalibrate before diving�
All sensors display FAIL after calibration
This could be caused by an accidentally unplugged cable or a
damaged cable or connector� Also, accidentally performing the
calibration in air or without a proper oxygen flush could cause this
problem. A failed calibration can only be fixed by performing a
successful calibration�
PPO2 does not show 0.98 after calibration
If you use a calibration FO2 setting of 0�98 and are at sea level, you
probably expect the calibrated PPO2 to show 0�98� Sometimes you
might correctly get a different value like 0�96 or 1�01�
This is because weather causes minor changes in barometric
pressure� For example, say a low-pressure weather system has
reduced the normal (1013mbar) barometric pressure to 990mbar� The
PPO2 in absolute atmospheres is then 0�98 * (990/1013) = 0�96�
The 0�96 PPO2 result is, in this case, correct� At high altitudes, the
difference between FO2 and PPO2 will be even larger� To see the
current pressure, start at the main screen and press the SELECT
button a few times (displays as Pressure mBar NOW)�
DEPTH TIME STOP TIME
.98
O2/HE NDL TTS
CC 21/OO O O
O
DEPTH TIME STOP TIME
.98 .97
FAIL
O2/HE NDL TTS
CC 21/OO O O
O
DEPTH TIME STOP TIME
FAIL FAIL FAIL
O2/HE NDL TTS
CC 21/OO O O
O
Cal. milliVolts
Cancel
Calibrate
O
46
O
Cal. @ FO2= .98
.OO
.86
.OO
DEPTH TIME STOP TIME
.96 .96 .96
O2/HE NDL TTS
CC 21/OO O O
O
DEPTH TIME STOP TIME
.96 .96 .96
PRESSURE mBar
O
SURF
99O 99O
NOW
Summary of Contents for Petrel EXT
Page 1: ...Standalone EXT Models...