Shearwater Research Inc.
Revision 1.1.0
30
Shearwater Petrel
Menu Reference
Turn Off
The “Turn Off” item puts the computer to sleep� While sleeping, the
screen is blank, but the tissue contents are maintained for repetitive
diving� The “Turn Off” menu item will not appear during a dive on any
model� It will also not appear after a dive until the End Dive Delay
Time has expired to allow for a continuation dive�
Calibration
The Calibrate menu is only available on the Petrel EXT model� It will
only appear when in CC mode with the PPO2 mode set to Ext� This
menu calibrates the mV output from the oxygen sensors to PPO2�
Upon selecting the calibration menu, the screen will show:
• Top row:
Millivolt (mV) readings from the 3 O2 sensors�
• Middle row: PPO2 values (using the previous calibration)�
• Bottom row: The calibration gas fraction of O2 (FO2)�
If you need to change the calibration gas FO2, do this in the System
After flooding the breathing loop with the calibration gas (typically pure
oxygen), press the SELECT button to perform the calibration�
Good sensors should be in the range of 35 - 65 mV at sea level in
100% oxygen, so a sensor will fail calibration if not in the range of
30mV to 70 mV� This allowable range scales automatically with
changes to FO2 and barometric pressure� A millivolt reading is shown
in
yellow
if outside the allowable range�
Once the calibration completes, a report will be shown� This shows
which sensors passed calibration, and the value of the expected PPO2
based on barometric pressure and the FO2�
Back at the main screen, the displays should now all read the expected
PPO2� For example, if FO2 is 0�98 and barometric pressure is 1013
mbar (1 ata), then PPO2 will be 0�98� If any display shows
FAIL
, the
calibration has failed because the mV reading is out of range�
The “Calibrate” menu item will not display during a dive�
DEPTH TIME STOP TIME
O
Turn Off
.98 .98 .98
DEPTH TIME STOP TIME
O
Calibrate
.85 .86 .84
DEPTH TIME STOP TIME
O
CC 21/OO O O
.98 .98
FAIL
O2/HE NDL TTS
Cal. milliVolts
Cancel
Calibrate
42 46
25
Cal. @ FO2= .98
.85 .86
.62
Summary of Contents for Petrel EXT
Page 1: ...Standalone EXT Models...