cootwo User Manual – Rev. 20170512 ©2017 DiveNav, Inc. – www.divenav.com
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5 QUICK GUIDE
To turn ON your cootwo just push the activation button;
cootwo will first show a welcome screen and then, if there
are no errors or warnings conditions, will enter the main
screen.
See the SETTINGS section for more details on errors or
warnings conditions and the various operating screens
supported by cootwo.
There is no need to turn OFF your cootwo as it will
automatically go to sleep after a couple of minutes. You can
program the sleep time using the My Nitroxbuddy app.
cootwo comes with a Carbon Monoxide sensor that is
already factory calibrated and its calibration should last
about 1 year from the factory shipment date.
See the CARBON MONOXIDE SENSOR section for
more info on how to calibrate the Carbon Monoxide sensor.
The Oxygen sensor calibration lasts only few hours, so,
before you can use your cootwo you must calibrate its
Oxygen sensor. In fact, it is good practice to calibrate the
Oxygen sensor before each use.
With cootwo you can perform an Oxygen sensor
calibration either with the stand-alone unit or with the
assistance of a smartphone.
The stand-alone, manual Oxygen calibration is limited
to air, it is time based and it takes 1 minute while the
smartphone assisted Oxygen calibration has more flexibility;
as an example, using the My Nitroxbuddy app you can
calibrate the Oxygen sensor using any single reference gas
or you could even perform a 2-point calibration using two
reference gasses. See the My Nitroxbuddy app tutorial on
www.divecomputertraining.com
for more information.
To perform a manual Oxygen sensor calibration with the
stand-alone unit, first turn the unit ON by pushing the
activation button, then, once cootwo is in the main screen,
HOLD the button for 2 or more seconds to enter the main
settings screen. From there, push the button once for about
1 second to select O2 CAL and then HOLD the button to
enter the O2 calibration screen.
During an Oxygen sensor calibration it is very important
to expose cootwo to a known source of gas flowing at a
constant rate.
If you plan to perform an Oxygen sensor
calibration by exposing cootwo to ambient air MAKE
SURE cootwo acclimates for at least 5 minutes as the
gas flow within the device is reduced and a shorter
period might produce incorrect results.
Now, position your cootwo in front of the valve of a
scuba tank containing air and open the tank valve slowly so
to limit the gas flow to few liters per minute. If you have
ordered the Low Pressure Inflator adapter then you can
connet your cootwo directly to the low pressure hose. Once
you are ready PUSH the activation button to start the
Oxygen sensor calibration.
As mentioned above, the stand-alone, manual Oxygen
calibration is limited to air, it is time based and it takes 1
minute.
Now that cootwo is calibrated, go ahead and use it; if
the unit is asleep turn it ON by pushing the activation button,
then, once cootwo shows the main screen, position your
cootwo in front of the valve of the scuba cylinder containing
the breathing gas you want to analyze and open the tank
valve slowly so to limit the gas flow to few liters per minute.
Hold steady and after few seconds you will see the
value of Oxygen and CO updating on the display. We
recommend to hold the analyzer in position for about 60
seconds.
Once the analysis is completed you have the option to
hold the results on the screen for about 60 seconds; to do
so, just push the button until you see the letter “H” next to
O2 on the top of the display.
6 SETTINGS
6.1
Button
cootwo ‘s single button has two modes: PUSH or HOLD.
PUSH is when you push the button for about one
second and then you release it.
HOLD is when you push the button for more than 2
seconds and then you release it.
For multiple pushes, like when navigating a sub-menu,
you will need to wait about one second between
consecutive pushes.
6.2
Display
Cootwo is equipped with a Dot-Matrix LCD display with
user programmable backlight; you can program the intensity
of the backlight and its duration.
The image below shows the Normal Operating Mode
screen.
The bluetooth symbol could be either OFF, ON or
flashing. When it is flashing it means that cootwo is
advertising its presence and it is ready to be connected to a
smartphone equipped with the My Nitroxbuddy app.
If the bluetooth symbol is always ON it means that
cootwo is actually connected to a smartphone.
If the bluetooth symbol is OFF it means that the radio is
sleeping.
To awake the bluetooth radio just PUSH the activation
button and the bluetooth symbol will begin to flash and will
continue to do so for about 2 minutes. After that period that
bluetooth radio will go back to sleep.
6.3
Menus Navigation
The navigation among the various menus is done via a
combination of HOLD and PUSH. In general a HOLD enters
a sub-menu while a PUSH moves the cursor to the next
item in the menu.
To enter the Main Settings menu from the Normal
Operating Mode just HOLD the button.
Please note that the stand-alone settings are accessible
only when cootwo is NOT connected to a smartphone.