ANALOX 02 EII Pro User manual

Analox Limited
15 Ellerbeck Court, Stokesley Business Park,
North Yorkshire, TS9 5PT, UK
T: [phone] F: [phone]
W: www.analox.net E: [e-mail]
O2 EII Pro
Technical Manual

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Technical Manual
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Revision history
Date
Rev
By
DCN
Comments
Checked
Date
21/04/2015
00
EJ
2015-
0046
Original Issue (Derived
from MO2-801)
PJO
29/04/2015

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Table of Contents
1Packing and Contents Check .................................. 7
2About the O2 EII Pro ............................................. 8
3Setting up your O2 EII Pro .................................... 9
3.1 Fitting the O2 Sensor .................................................. 9
4Operation............................................................. 11
4.1 Controls .................................................................... 11
4.2 Air Calibration ........................................................... 12
4.3 Checking your Tank................................................... 13
4.4 BCD Adaptor.............................................................. 15
4.5 Taking a reading from your BCD................................ 15
4.6 Accessories ............................................................... 17
5Quick Check ......................................................... 18
6After Sales Service............................................... 19
6.1 Battery Replacement................................................. 19
6.2 Sensor Replacement.................................................. 19
6.3 General Care ............................................................. 20
6.4 Sensor Handling Information .................................... 20
7Safety Information .............................................. 21
8Warranty Information.......................................... 22
9Specification ........................................................ 23
10 Oxygen Compensation Chart for Moisture in the
Atmosphere ................................................................ 24
11 Disposal............................................................... 25
12 Declaration of Conformity.................................... 26

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1Packing and Contents Check
On Opening your Analox O2 EII Pro, please check you have the following items:
a) O2 EII Pro.
b) O2 Sensor.
c) Dome adaptor with Hose Barb (to receive a sample from your BCD).
d) O2 EII Pro Quick Start Guide.
e) Any accessories ordered for your O2 EII Pro.

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2About the O2 EII Pro
The O2 EII Pro Oxygen Analyser is designed to measure Oxygen levels in the range 0.1
100% O2 for tank oxygen level verification.
The O2 EII Pro is ergonomically designed, and equipped with several features to ensure
ease of use, and reliability. The instrument has been designed to be held in the left
hand to enable ease of use when checking your tank. It is fitted with a large digital
display and operates from an internal temperature compensated electrochemical
oxygen sensor. Power is provided by a 9V battery which will last for approximately 1
year before replacement is necessary. The O2 EII Pro will automatically switch off after
10 minutes to ensure battery life is not compromised if the instrument is accidentally
turned on.
The O2 EII Pro is water and drop resistant. Designed specifically for the diving industry
–whether you may be a Sport (NITROX), Commercial or Military diver where hostile
environmental conditions are the norm not the exception.

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3Setting up your O2 EII Pro
NOTE: ON OPENING YOUR O2 EII PRO YOU WILL HAVE TO FIT THE O2
SENSOR.
3.1 Fitting the O2 Sensor
1. Remove the contents and take the sensor out of the packaging and carefully cut
open the antistatic bag to obtain the sensor. Allow the sensor to settle for 24hr prior
to use.
2. Loosen the 4 screws located on the front cover. The gasket seal is designed to prevent
water leaking into the O2 EII Pro as a result the seal may be tight. Loosen the seal
by moving the lid from side to side, and then and carefully lift the cover.
3. Screw the sensor to the inside of the front cover tightly.

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4. Connect the JST cable connector to the JST header on the PCB of the O2 Sensor.
5. Replace the cover carefully taking care that the sensor locates properly and that you
do not trap any wires. Screw down until you feel the gasket tighten; do not over
tighten the screws.
Your Oxygen Analyser is now ready to take a reading.
CAUTION: IF AFTER HANDLING THE SENSOR YOUR FINGERS OR OTHER PARTS
OF YOUR BODY FEEL SLIPPERY OR STINGS WASH WITH A LOT OF WATER. IF
STINGING PERSISTS GET MEDICAL ATTENTION! REFER SECTION 7.0, SAFETY
INFORMATION.

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4Operation
4.1 Controls
The analyser is fitted with an ‘On’ button located on the side of the unit, when held in
your left hand the button should sit comfortably under your thumb. To turn the unit on
press the button once, the unit will automatically turn off 10 minutes after the button
has been pressed, as a result if the O2 EII Pro is accidentally turned on your battery will
not be drained of power. When it is switched on the analyser's display will show an
oxygen reading do not use the O2 EII Pro before calibration (see Section 3.2).
The ‘On’ button also acts as a hold button, to freeze the reading on the display press
the ‘on’ button once. A ‘:’ symbol will appear to show the instrument is holding the
reading. To cancel the hold press the ‘On’ button once, the ‘:’ symbol will disappear and
the instrument will monitor ambient O2.
The low battery warning is a shown by ‘L’ on the display. When present, change the
battery before using the instrument (see Section 5.0, After Sales Service).
A waterproof calibration knob is located on the front. Turn it fully from left to right and
then fully left, the reading should increase and then decrease. (If the reading does not
change see Section 4.0, Quick Check).
NOTE: IF LOW BATTERY SYMBOL IS SHOWN REPLACE THE BATTERY ASAP.
Switch on
Reading Held
Reading released monitoring
ambient O2
‘L’ Low battery symbol

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4.2 Air Calibration
WARNING: THE ANALYSER IS SENSITIVE TO OXYGEN PARTIAL PRESSURE. TO
ENSURE YOU ARE RECIVING THE MOST ACCURATE READING, CALIBRATION
MUST ALWAYS BE CARRIED OUT AT THE SAME ATMOSPHERIC PRESSURE AS
OXYGEN MEASUREMENT.
Air calibration is essential before every use and is performed as follows:
1. Ensure that the sensor saver is not in place and that the EII adapter is fitted. The
adapter simply pushes into the sensor aperture.
2. Expose the analyser to clean air for two minutes and adjust the calibration knob
until the display reads the correct value using the oxygen compensation chart (you
can find this chart on the inside of the back cover). If this is not possible refer to the
note below or to Sections 4.0, Quick Check and 5.0, After Sales Service.
The Analyser is now ready for oxygen management.
NOTE: AT VERY HIGH ALTITUDE, IT IS POSSIBLE THAT NORMAL CALIBRATION
IS NOT ACHIEVABLE. FOR USERS WHO INTEND TO USE THE ANALYSER AT
ALTITUDE, PLEASE REFER TO OUR WEB SITE FOR ADDITIONAL TECHNICAL
INFORMATION.
Calibration in clean air

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4.3 Checking your Tank
WARNING: VERY HIGH FLOWS MAY PRESSURISE THE SENSOR AND
INACCURATE READINGS OR SENSOR DAMAGE WILL RESULT.
The Analox O2 EII Pro comes complete with a unique sampling dome which allows you
to directly apply the analyser to the outlet on your nitrox tank.
1. Ensure the sensor saver is removed. Push the sampling dome into the sensor
aperture.
2. Ensure the Analox O2 EII Pro has been calibrated as per the instructions in Section
3.2.
3. Very slowly open the pillar valve with your right hand until gas can just be heard
quietly hissing out.
4. Once the pillar valve has been opened and the nitrox is heard gently hissing, hold
the O2 EII Pro in your left hand and press the sampling dome firmly against the
tank outlet.
CAUTION: OPEN TANK VALVE EXTREMELY CAREFULLY BEFORE THE O2 EII PRO
IS APPLIED
5. Close the pillar valve after fifteen seconds when a stable reading is observed on the
O2 EII Pro.
6. If in doubt repeat the procedure taking care to ensure a very low gas flow.
Take a direct reading
from your tank
Open the tank until the
nitrox is gently hissing out

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7. For ease of use when sampling several tanks, the O2 EII Pro is fitted with a hold
feature. Once a stable reading has been observed, press the on button to hold this
reading. The O2 EII Pro can then be moved away from the tank to enable you to
record the O2 reading. To cancel the reading press the on button once.
8. It is important to note that after a few seconds of the gas flow being stopped the
reading will begin to change towards the level in the surrounding air of 20.9% O2
you should therefore take the reading or press the hold button while flow is ON.
Reading held

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4.4 BCD Adaptor
WARNING: IF A FLOW RATE IN EXCESS OF 2 LITRES PER MINUTE IS PASSED
OVER THIS SENSOR WHEN TAKING A READING, THIS WILL PRESSURISE THE
SENSOR AND MAKE THE READING INACCURATE.
NOTE: BEST ACCURACY IS ACHIEVED WITH A FLOW BETWEEN 0.5 TO 1 LITRES
PER MINUTE. IT IS THE USERS’ RESPONSIBILITY TO PURCHASE THE CORRECT
CONNECTION EQUIPMENT IN ORDER TO DO SO. FOR MORE INFORMATION
PLEASE CONTACT US.
4.5 Taking a reading from your BCD.
Tank contents can be checked either during setup of rig or just before dive.
1. Connect the BCD to the tank.
2. Prior to fitting the tank hose to the BCD connect the tubing (Listed in the Accessories
table) to the spigot on the dome adaptor on the O2 EII Pro.
3. Connect the other end of the tubing to the analyser flow restrictor.
4. Connect the analyser flow restrictor to the tank hose
Connecting the BCD to
the tank
Connecting the BCD tubing to
the flow restrictor
Connecting the flow restrictor
to the tank hose

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5. Allow the O2 EII Pro reading to settle and then take a reading by pressing the power
button.
6. Disconnect your O2 EII Pro from the BCD and connect the tank hose back up to the
BCD.
You are now ready to dive.

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4.6 Accessories
The O2 EII Pro can be supplied with any of the following accessories;
Item
Description
Part Number
Storage Case:
Storage Case; compact water proof case
ideal for protecting your O2 EII Pro.
SA2EIIMINICASE
Sensor Saver:
Sensor Saver; push in cap to reduce the
sensors exposure to oxygen and extend
its life.
These are available in packs of 5&10.
Pack of 5:
SSP1
Pack of 10 :
SSP2
Dome Adaptor (With Hose
Barb):
Dome Adaptor; push in dome with Barb
fitting to receive sample direct from tank
or from BCD (Via barb fitting).
MO2-475
Dome Adaptor (Without Hose
Barb):
Dome Adaptor; push in dome to receive
sample direct from tank
MO2-422
Replacement Tubing (Per
Metre):
Tubing; to connect from Barb fitting to
BCD to pass the sample across.
1817-5000

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5Quick Check
Symptom:
Condition:
Action:
‘L’ Symbol
Low Battery
Change Battery
No Display
Switched off
Bad connection
Switch on
Check Battery connection
Return to supplier
Zero Reading
Sensor disconnected
Sensor expired
No oxygen
Check connection
Change sensor
Check in air and ensure sensor saver is
removed
Reading erratic
Pressure on sensor
Radio transmission
Sensor old or faulty
Condensation on sensor
Check flow
Move unit away
Change sensor
Dry sensor face
Reading does not
change when
calibration knob is
turned
Reading held
Sensor failure
Faulty connections
Press on button to unfreeze
Change sensor
Return to supplier
Display segments
missing
Display faulty
Return to supplier
Will not calibrate
Sensor faulty
Sensor not in air
High altitude
Change sensor
Check EII Pro adaptor is fitted correctly
Please refer to website
Reading drifts
Rapid temperature change
Do not move analyser from one
temperature to another immediately
before use

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6After Sales Service
6.1 Battery Replacement
1. Loosen the 4 screws located on the front cover. The gasket seal is designed to
prevent water leaking into the O2 EII Pro as a result the seal may be tight. Loosen
the seal by moving the lid from side to side, and then carefully lift the cover.
2. Slide the battery out of its holder and disconnect the lead.
3. Connect the lead to the new battery and slide the battery into its holder, under the
battery clip
4. Replace the cover carefully taking care that the sensor locates properly, and that
you do not trap any wires. Screw down until you feel the gasket tighten; do not
over tighten the screws.
6.2 Sensor Replacement
1. Replacement part number for your sensor is: 9100-9220-9B
2. Loosen the 4 screws located on the front cover. The gasket seal is designed to
prevent water leaking into the O2 EII Pro as a result the seal may be tight. Loosen
the seal by moving the lid from side to side, and then and carefully lift the cover.
3. Disconnect the connector from the back of the sensor.
4. Unscrew the sensor from the front cover.
5. Dispose of the old sensor according to local regulations for lead and potassium
hydroxide solution.
6. Remove the new sensor from its pack and check it for leaks, check the sensor has a
rubber o-ring fitted at the base of the thread on the front of the sensor. Screw the
sensor into the front cover tightly and connect to the EII connector. An arrow on the
back of the sensor shows where the connector should be fitted. Make sure the metal
prongs on the connector are facing the sensor and push in firmly.
7. Replace the cover carefully taking care that the sensor locates properly and that you
do not trap any wires. Screw down until you feel the gasket tighten; do not over
tighten the screws.
8. Push on the EII adapter.

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6.3 General Care
Although designed to be water resistant the O2 EII Pro should not be intentionally
immersed in liquid or left outside unprotected.
The O2 EII Pro is built to resist the effects of day to day shocks and drops but
remember it is a precision oxygen analyser and should be looked after carefully to give
long trouble free service.
To clean the O2 EII Pro use a damp soft cloth.
Protect the O2 EII Pro from long periods of direct sunlight and do not subject it too high
or low temperature extremes.
The sensor in the O2 EII Pro is an electrochemical device and contains a caustic
electrolyte. Always check to make sure that it is not leaking and do not allow it onto
any part of your body or clothing. In the event that you do come into contact with the
electrolyte wash the contaminated part with copious amounts of water see Section 6.0,
Safety Information.
Analox 9100-9220-9B type Oxygen Sensor:
CAUTION: IF AFTER HANDLING THE SENSOR YOUR FINGERS OR OTHER PARTS
OF YOUR BODY FEEL SLIPPERY OR STINGS WASH WITH A LOT OF WATER. IF
STINGING PERSISTS GET MEDICAL ATTENTION! REFER SECTION 7.0, SAFETY
INFORMATION
6.4 Sensor Handling Information
O2 EII Pro oxygen sensors are normally supplied in sealed packs. Before the pack is
opened check that the sensor has not leaked. The sensors are themselves sealed and
do not under normal circumstances present a health hazard however if leakage of the
potassium hydroxide electrolyte has occurred use rubber gloves and wear chemical
splash goggles to handle and clean up. Rinse contaminated surfaces with water. If
anybody comes into contact with the electrolyte, please refer to Section 6.0, Safety
Information.