Scubapro-uwatec OXY2 User Manual

THE SYSTEM

English

Oxy2

OPERATING MANUAL

English

SWISS MADE BY UWATEC AG

List of chapters

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

How to operate the Oxy2 . . . . . . . . . . . . . . . . . . . . . . . . . 5

Switching the unit on and off . . . . . . . . . . . . . . . . . . . . . . . . 6

Checking the remaining battery and O

Checking the Oxy2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Pairing of the Oxy2 with a dive computer . . . . . . . . . . . . . . . . . . 9

Mounting the Oxy2 on a rebreather . . . . . . . . . . . . . . . . . . . . 10

Warnings and service messages . . . . . . . . . . . . . . . . . . . . . . . 11

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

O

2

Calibrating the O2sensors . . . . . . . . . . . . . . . . . . . . . . . 14

Replacing the O2sensors . . . . . . . . . . . . . . . . . . . . . . . 17

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . 21

Maintenance and Storing . . . . . . . . . . . . . . . . . . . . . . . . 24

Technical Information / Features . . . . . . . . . . . . . . . . . . . . . . 25

Diving in Mountain Lakes . . . . . . . . . . . . . . . . . . . . . . . . . 26

Pressure Chamber Tests . . . . . . . . . . . . . . . . . . . . . . . . . 26

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

-sensor lifetime . . . . . . . . . . . 6

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3

English

Introduction

The Oxy2 is fitted “in line“ to the inhalation hose
of the semi closed rebreather (SCR) and measures
the actual oxygen fraction of the inspired gas mix­ture. This information is displayed on the Oxy2 dis­play and can be transmitted to a paired hoseless
dive computer (Aladin

®

Air X O2). This is the basis
for the calculation of both oxygen toxicity and
decompression, based on the real values of the
inhalation gas. Up to now the composition of the
gas had to be estimated.

®

The Aladin

Air X O2calculates the diver`s oxygen
metabolism using the measured oxygen fraction
of the inhalation gas mix, plus the automatically
determined oxygen fraction of the premixed gas
and a value for the highest oxygen consumption
you calculate with (programmed into the Aladin
Air X O2with DataTalk software). Using these 3
values the diver`s workload is calculated on line
and updated in real time. The significance of these
calculations should not be underestimated becau­se both the oxygen toxicity – measured by the CNS
clock – and the speed of nitrogen diffusion in the
muscles is affected by workload. Due to the higher
workload the diver`s metabolism gets more activa-

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ted and accelerates the nitrogen uptake. At the
same time the oxygen fraction goes down due to
the increased need for oxygen and the nitrogen
fraction is increased. This means that a higher
workload accelerates the uptake of the nitrogen
and additionally the nitrogen fraction increases.

This shows how important it is to know the com­position of the inhalation gas, measured by the
Oxy2. Only with this information can the diver
have updated information (online) about decom­pression and oxygen toxicity. All this increases the
safety of diving.

®

• Diving with a semi-closed rebreather (SCR) needs special education!

• Please read this manual carefully to the end!

• Before the first use, the O2sensors have to be fitted and calibrated. See Page 17
and 14.

How to operate the Oxy2

The user can operate the Oxy2 by using the 3 contacts and the turnable switch. The
user has – similar to the Aladin dive computers – to bridge two contacts with moi­stened fingertips.

B Base contact, must to be touched for all user

operations

E Enter contact, selects / confirms the current input
S Switch contact, changes the settings

Instruction for manual inputs.
For example: Bridging the contacts B and E.

English

turnable

switch

B

Cal.

Run

Instruction for the turnable switch
For example: The switch has to be in „RUN“ position

E

S

5

Switching the unit on and off

Switching on

Manually: by bridging contacts B and E .
Automatically: by dip (dipping) into water.

• The Oxy2 has to be switched on manually before the dive in order that it is checked.
see page 7.

Cal.

After being switched on the unit first runs a display check – for the first 4
seconds all the display segments are displayed. Then the screen shows the

Run

current oxygen percentage. The turnable switch has to be in position ”RUN“.

Switching off

The unit automatically switches off if a dive has not commenced within 30 minutes of
either switching on the Oxy2 or a calibration was done. 30 minutes gives the diver
enough time to thoroughly check his equipment and to start the dive.
After a dive the unit switches off automatically after 15 min..

Checking the remaining battery and O2sensor lifetime

The remaining battery lifetime can be checked – after the unit has been switched on
– by connecting the contacts B and E . The display shows for 4 seconds the battery
symbol and the remaining percentage of the battery lifetime and afterwards for ano­ther 4 seconds the O

sensors remaining percentage lifetime.

2

6

Checking the Oxy2

Before each dive the Oxy2 has to be checked as follows:
Remove the Oxy2 from your equipment and move it very slowly through the air for a
few seconds. If the reading is within 20.9% ±0.2% O
the display is not visible, no further calibration is necessary.

A recalibration is necessary if:

• The reading shows less then 20.7% O

• The reading shows more then 21.1% O

• The „CAL“ segment on the display is visible

On page 14 is described how to calibrate the Oxy2.

The O
See page 17.

If there is no reliable measurement possible the unit shows the „CAL“ segment and
the sensor segment. First try a calibration. A sensor replacement may be necessary if
the calibration is not successful. See page 17 (Replacing the O

and if the „CAL“ segment on

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2

2

sensors have to be replaced if the display shows the sensor segment.

2

Sensors).

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English

7

The battery has to be replaced if the display shows the battery segment. See page 21
(Replacing the battery).

Replace the battery if the remaining capacity would not be enough for the planned
dives.

Check that the Oxy2 is fitted to the inhalation hose of your rebreather!

Check the communication between the Oxy2 and the dive computer before each dive!
You will find more about the communication in the user`s manual of your dive com­puter.

8

Pairing the Oxy2 with a dive computer

The Oxy2 sends every 5 seconds the actual oxygen values of the inhalation gas to an
Aladin®Air X O2or a compatible dive computer. The dive computer and the Oxy2 need
to be paired to make sure that the dive computer receives and uses the data from its
own Oxy2.

A pairing is necessary:

• Before the first dive of an Oxy2 with a dive computer

• If you change from a pressure transmitter (air/nitrox) to an Oxy2 or the reverse

• If you use a new Oxy2 or dive computer

• After a change of the dive computer battery

• Oxy2 and Aladin®Air X O2must be paired if you change from using a pressure trans-

mitter (air/nitrox) to an Oxy2!

English

The Oxy2 sends a pairing string during switching on the unit and at the begin­ning of the battery and O

Make sure that the Oxy2 and the dive computer touch each other during all the pai­ring process, until after the pairing has been confirmed. See page 6 (Checking the
remaining battery and O

• You find more detailed information about pairing in the Aladin®Air X O2manual.

sensor lifetime check.

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sensor lifetime).

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