Alpha-1 Oxygen
~Analyser
• Water Resistant Aluminium Case
• Easy Calibration
• Fast Sample and Recovery
• Extended Sensor Life
• Accurate to
0.1
%
Alpha-1 Control Solutions Oxygen Analyser
The Alpha-I Oxygen Analyser has been designed by divers for divers.
The Analyser is very easy to use and is highly accurate. The Oxygen
Sensor has been specially developed for the
Alpha- I Analyser and together with the electronics is temperature stable over the range
of
- 20 to +50 degrees
Celsius.
The
Sensor is fitted with a Sealing Cap which when fitted extends the life
of
the Sensor. The Sensor life is
approximately 2
years+
in normal air (20.9%) and greater when the cap is fitted.
The robust aluminium case is sealed to
IP65 (sprayed
jets
of
water), the Sensor Sealing Cap should always be fitted
ifthe
unit is likely to get wet. Do
not
puncture
or
remove the white
membrane
in
the
sensors
gas
inp
ut
port.
WARNING the universal
Sampling
Adapter
can
not
withstand
high
pressure
s. Only fit to a partially open
cylinder valve once steady low flow has been obtained.
NEVER fit to a closed valve and then try to obtain a
sample as the
Sensor can be damaged beyond
repair by too high pressures.
The
correct method
of
use is fully
described
in
the Operating Instructions below.
Operating
Instructions
I - Remove the Sensor Sealing Cap and turn on the Analyser by pressing the
on/off
switch. Allow 3-5 minutes for
the
Sensor to stabilise to normal air.
The
display will remain constant once stabilised.
Calibrate the Analyser by adjusting the
Ca
libration Control until a reading
of20.9%
is displayed.
IMPORTANT Calibration should be performed out doors in Dry, Fresh Air. The nominal percentage
of
Oxygen
indoors is very seldom
20.9% and can be as low as 19.9%. A normal air fill serves as an excellent calibration
reference
if
indoor calibration has to be carried out.
2 - Slowly open the cylinder valve
of
the cy linder to be sampled to test the action
of
the valve. The valve
must
be
able to be adjusted to allow a constant minimal flow. With practise this is nearly always achievabl
e.
3 - Fit the universal Sampling Adapter to the partially open valve as shown in the photo
's
below:
Universal Sampling Adapter Fitted to an 'A' Clamp Valve Fitted to a DIN valve
Finally check that a low volume constant
fl
ow
of
gas can be heard venting
from the Sensor Flow adapto
r.
It is important to note that too high a flow
level can over pressurise & destroy the sensor
Se
nsor Flow Adaptor.
4 - The last action is
to
push the Sensor Flow Adapter into the Oxygen Sensor
to
commence sampling the gas.
After approx
im
ate ly
45
seconds the Analyser display will stabilise
and
indicate the percentage
of
Oxygen in the
gas. Accuracy can be confirmed by removing the Sensor Flow Adapter from the Sensor and allow approximately
another 45 seconds for the analyser to return
to the original calibration setting +-0. I%.
(remember
to u
se
exactly the sa
me
conditions used to obtain
the
original calibration)
5 - Replace the Sensor sealing cap when not analysing. Leave the unit switc hed on and observe the display which
will start
to
increase
as
the cap creates a seal. Cease tightening when the display has increased. DO NOT over
tighten the cap as this is not required and a poor seal may result
ifthe
internal 'O' ring
is coll
apsed.
6 - Switch
off
the analyser
by
pressing the on/off switch.
Battery
Replacement
A low battery
is
indicated
by
the display showing a battery symbol at the left hand top corner
of
the display
Remove the 4 x screws that secure the rear cover and remove the cover. The battery will been seen in the lower part
of
the case. The battery is a 9 vo
lt
PP3(MN1604) type and
it
is recommended that
an
alkaline type is used.
The easiest way
to
replace the cover is
to
position the sealing correctly on to the cover, then invert the analyser case
onto the cover, and then turn the unit over and replace the screws. Take care not
to
over tighten the screws
as
the
aluminium case
is
quite soft.
Se
nsor
Replace
ment
The Sensor will require replacement one day. The replacement Sensor should
be
obtained from the store that
supplied the analyser . This can easily be fitted into the unit
by foll
owing the instructions supplied with each
replacement Sensor. To ensure continued accuracy, it
is
essential
to
fit
an original Alpha- I replacement Sensor.
Warranty
Terms
The Sensor
is
covered by a l year warranty and the Analyser is covered by a 2 year warranty commencing from
date
of
purchase. Please be sure
to
retain your receipt as this serves
as
the warranty document.
Exclusions from
Warranty
Th
e following are not included
in
the warranty period
s:
- Sensor over pressure damage. Providing that the Operating Instructions are followed correct ly
This can not
occur.
- Mechanical damage
to
the Analyser and fittings and the Sensor gas input port membrane
-
Lngress
of
water into the Analyser resulting from
an
incorrectly fitted or damaged rear cover sealing gasket.
- Ingress
of
water into the Analyser
ifthe IP65
rating has been exceeded.
- Loss
of
fittings, hoses etc.
Removal or defacement
of
the Sensor identification label w
ill
invalidate the Sensor Warranty.
Specifications
Range
Li
nearity
Sensor Resolution
Sensor L
if
e
Se
nsor Response to Target (T)
Working Temperature Range
Storage Temperature Range
Disp
la
y
Calibration
Environmental Seal
Battery
Weight
Sensor Replacement
Support Telephone Number
0-100% Oxygen
Linear through out ran
ge
0.1% (see below)
2 Years + (average diver use)
>
50
seconds
0
to
+50 degrees Celsius
-20
to +50
degrees Celsius
3.5 digit LCD
IOmm
character height
Manual
to
ambient Dry, Fresh a
ir
to 20.9% for
EAN
's up
to
60%.
Above 60% sampling, calibrati
on
to 100% Oxygen.
IP65 - Sprayed jets
of
water
PP3 (MN 1640) Alkaline
420 grams
By
end user or dive store
+44(0)
148
9878055
Alpha-1 Analyser re-Calibration
The Analyser
will
requi
re
internal secondary calibration before thf:
Sen
sor ex
pire
s. This wi
ll
bec
ome
apparent
as
the 20.
9%
calibration setting
will
not
be
achievable. A steady
lowf
:r value will inste
ad
be display
ed. Calibration
is
performed
as
follow
s:
1.
Remove
the rear cover.
2.
The internal re-calibration control
is
located at bottom centre port ( red)
in
the sealed
elf:
ctronics module. This
is a fine
multi-tum control
and
will
need
to
be
turned
sever
al time
s.
3.
Tum the front user calibration co
ntrol
fully
clockwise
to
obtain t
he
maximum
reading.
4. Adjust t
he
internal calibration control
until
a nominal reading
of22.2%
is
displayed (see
bel
ow for variations).
l)fJ>ORTANT
Carry
out
the re-calib1·ation outdoot:ti!!..Qry,
Fre
sh
Ai.£,
The
nominal setting
of 22.
2%
varks according
to
the local atmospheric press
ure.
This can
be
obtained from
an
accurately set barometer or by
con
tacting a
loc
al weather station or one
of
the
mimy we
ather websites
now
on line.
For
UK users
we
recommend the
fo
llowing website: http:
//
www. weather .CO. u
k/
the loc
al
atmospheric
pressure
is
obtained by entering th•e
postcode
of
your
loc
ation.
The no
minal
atmospheric pressure is
1013mb.
Each
5mb
variation requires a .1 % offset to the nomin
al setting
of
22.
2%.
In
most
cas
es
a setting of22.2%
will
be
OK
providing that th•! true
atmospheric
pressure is not
too high
or too
low
.
Consult
th·
~
table below
for
these variations:
5. Replace t
he
rear
coYer.
The
Analyser is n
ow
re-calibrate
d.
High Pressures
Low
Pressw-es
Pressure Value
Pre
ss
me
Value
·-
-·
·-
1013 mb 22.2 1013
mb
22.2
1018 mb 22.3 1008 mb
22.l
1023 mb 22.4
1003 mb 22.0
1028
mb 22.5
998m
b 21.9
1033 mb 22.6 993 mb 21.8
1038 mb
22.7 988 mb 21.7
·-
1043 mb 22.8
983 mb 21.6
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