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MSL 72.161 Jetsam/Orca Spirit manual R.5
Shearwater Computers
Some of the basic Shearwater informa on is included here. This informa on has been obtained from the Shearwater
manual. Please note that this informa on is subject to change; for full and current informa on on the Shearwater
computers, diver’s should download the most current manual from the Shearwater website.
SHEARWATER PRODUCT CONFIGURATION
Shearwater Research Inc. designs and builds both computers and HUD’s (Heads Up Display) for rebreather diving.
These systems may be fi ed to your rebreather by hardwiring a cable into the scrubber head, or u lizing a Fischer con‐
nector. For further informa on on any Shearwater product, please contact your local Shearwater dealer.
Bu ons:
MENU bu on ‐ Le
•
From the default display, pressing MENU brings up the menu.
•
Once in the menu system, MENU moves to the next menu item.
•
If the current func on is an edit, pressing MENU increments the current display.
SELECT bu on ‐ Right
•
In the menu system, the select bu on saves the current value or executes the command.
•
Out of the menu system, the select bu on brings up informa on displays.
BOTH BUTTONS
When the computer is off, pressing MENU and SELECT at the same me will turn the computer on.
Calibrate
Start by following the procedures on the calibra on page. These instruc ons must be followed
in order to ensure the unit is properly flushed with oxygen. This is an important step which is
required to ensure the calibra on will be accurate.
Once the unit is properly flushed with oxygen, push the le MENU bu on unit you see
“Calibrate” on the computer. Push the right SELECT bu on and the confirma on message will
display. On the top line, the millivolt reading will show. Good sensors should be in the range of
35‐ 60 mV at sea level in 100% oxygen. The valid millivolt range for calibra on is 30‐ 70 mV. This
scales with percentage of oxygen and barometric pressure.
Pressing the MENU bu on will prevent the calibra on. Pressing the SELECT bu on will cali‐
brate the sensor displays. The displays should now all read .98. If any display shows FAIL, the
calibra on has failed because the mV reading is out of range.
The system defaults to a calibra on gas of 98% oxygen. This is to compensate for the difficulty
in completely filling the loop with 100% oxygen and also to allow for water vapour. If you are
using a calibra on kit with no water vapour and 100% 02, you can set the calibra on gas to 100.
It can also be set to other values if pure oxygen is not available.
The calibra on takes into account the al tude at which the computer was turned on. For example, if the al tude was
885 mBar or .87 ATA, then with a 98% calibra on gas, the sensors would calibrate to .85.
The "Calibrate" menu item will not display during a dive.
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