cootwo User Manual – Rev. 20170512 ©2017 DiveNav, Inc. – www.divenav.com
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1 WELCOME
Thank you for purchasing cootwo, the world first dual-
gas Oxygen and Carbon Monoxide Analyzer specifically
designed for Scuba divers.
You can use cootwo either as a stand-alone device or
connected to your smartphone via Bluetooth.
When you use cootwo together with the My Nitroxbuddy
App you can analyze your scuba tanks using your
smartphone or tablet. You can also save logs of your
analysis and add to them useful information such as
images, tank info, fill cost, and dive operator.
You can also use the My Nitroxbuddy App to determine
the Maximum Operating Depth and the Equivalent Air
Depth. Check on our website how to get the My Nitroxbuddy
app.
2 COOTWO OVERVIEW
cootwo can analyze gasses with Oxygen content from
0.3% to 99.9% and is optimized to detect Carbon Monoxide
in the 0 to 20ppm range.
cootwo features a user rechargeable Li-Ion battery, a
Dot-matrix LCD display and a Bluetooth low energy
transceiver so it can be programmed and/or controlled with
a smartphone or a tablet.
The cootwo housing includes an integrated tank adapter
so it can be used to analyze a gas directly from a SCUBA
tank. Additionally DiveNav offers a low pressure BC adapter
accessory that mounts directly on the housing.
3 WARNINGS
Note
: Please note that this User Manual is applicable
only to cootwo analyzers equipped with firmware released
on or after May 1, 2017.
To check the firmware revision of your cootwo, connect
to it with a smartphone or a tablet equipped with the My
Nitroxbuddy app and then go to the Device Info screen.
If you have a cootwo with an older version of firmware
please contact DiveNav for procedures and costs to
upgrade your unit.
WARNING: Scuba Diving is a dangerous activity.
Diving with an incorrect breathing gas mix could lead to
serious personal injury and even death. Make sure you
know how to properly calibrate and use your cootwo.
Read and follow the instructions contained in this
manual.
WARNING: cootwo includes an Oxygen sensor that
must be calibrated before each use. An improper
calibration may result in the use of an incorrect
breathing gas mix, which could lead to serious personal
injury and even death.
WARNING: Do not use cootwo if you are not Nitrox
certified.
WARNING: Do not use cootwo if it is not calibrated.
WARNING: Keep cootwo away from heat sources.
WARNING: Do not expose cootwo to direct sunlight.
WARNING: Do not dive if your breathing gas mix
contains Carbon Monoxide.
WARNING: Do not place cootwo under heavy object
such as scuba tanks.
WARNING: Store cootwo in a dry place.
WARNING: Do not immerse cootwo underwater.
WARNING: cootwo includes an electrochemical
sensor containing potassium hydroxide which can
cause burns if it comes in contact with eyes, skin and
other body parts. Dispose of sensors according to local
regulations.
WARNING: cootwo is designed for use at
atmospheric pressures only. It is not designed for use
in a hyperbaric chamber. Use of cootwo in a hyperbaric
chamber will result in incorrect readings and may
damage the unit.
4 BEFORE FIRST USE
When you unpack your cootwo make sure you have
received all the accessories; if you have ordered a basic
cootwo you should have received also an USB charging
cable. If you have ordered a cootwo DELUXE, in addition to
the USB cable you should have also received a carrying
case and the Low Pressure Inflator adapter. Please note
that the carrying case is NOT waterproof.
Before you use your cootwo for the first time make sure
that it has not been damaged during shipping or that internal
components did not came loose. First check cootwo for any
sign of damage then gently shake it and listen for any
rattling sound.
Now turn ON your cootwo by pushing the activation
button and check for the battery symbol to be full. If not,
place cootwo under charge for a couple of hours.
If cootwo shows a Carbon Monoxide value higher than
zero it could be due to the fact that the analyzer might have
been exposed to high values of Carbon Monoxide during
shipping. In this case just place cootwo in an area well
ventilated and away from possible sources of Carbon
Monoxide and let it recover for an hour or so.