DO600-en-EU_V7.2 09/14
5
Measurements
1.
Cover
the
electrode
with
the
electrode
cap.
The
sponge
contained
in
the
cap
should
be
moistened
(not
soaked)
with
(distilled
water)
or
clean
tap
water.
2.
Pressing
the
ON/OFF
button
turns
the
meter
ON
or
OFF.
When
turned
ON,
the
meter’s
display
switches
on
and
the
Self
Calibration
utility
runs
(see
above).
3.
If
this
is
the
first
time
the
meter
is
powered
up,
wait
approx.
3
minutes
for
the
probe
to
polarize
(please
disable
auto
‐
power
off;
Instructions
for
disabling
auto
‐
power
off
are
provided
in
a
later
section).
For
more
details,
please
read
the
Startup
Polarization
Period
paragraph
earlier
in
this
manual
before
continuing.
4.
Select
the
desired
units
of
measure
by
pressing
and
holding
the
MODE/HOLD
button
until
the
proper
units
are
shown
in
the
display.
Remove
the
electrode
cover
and
place
the
electrode
in
the
sample
to
be
measured.
Stir
the
electrode
in
the
sample
to
remove
any
trapped
air
bubbles
from
the
membrane
surface.
Do
not
submerse
the
electrode
to
the
point
that
the
sample
liquid
reaches
the
meter’s
electrode
collar.
5.
Allow
the
meter
time
to
settle
to
the
final
measurement
value.
Note:
The
larger
the
difference
in
temperature
between
the
electrode
and
the
solution
the
longer
it
will
take
for
the
reading
to
stabilize.
Stabilization
time
can
vary
from
thirty
(30)
seconds
to
five
(5)
minutes.
Measurement
Units
The
meter
can
be
set
to
measure
either
%
saturation,
mg/l,
or
parts
per
million
(ppm).
To
change
the
mode:
1.
Press
and
hold
the
MODE/HOLD
button
for
2
seconds
and
the
display
will
begin
to
scroll
through
the
different
units
of
measure
:
%
saturation;
D.O.
in
mg/l;
D.O.
in
ppm
(parts
per
million)
2.
When
the
desired
units
are
displayed,
release
the
MODE/HOLD
button
and
the
unit
will
return
to
normal
operating
mode.
Note:
The
“HOLD”
function
cannot
be
on
when
changing
the
measurement
function.
If
“HOLD”
is
displayed
in
the
lower
left
corner
of
the
display,
briefly
press
the
MODE/HOLD
button
to
turn
it
off.
Temperature
Units
(ºF
/
ºC)
1.
With
the
unit
OFF,
press
and
hold
the
CAL/RECALL
button.
2.
With
the
CAL/RECALL
button
depressed,
momentarily
press
the
ON/OFF
button
to
turn
the
unit
ON.
3.
The
CAL/RECALL
button
can
be
released
when
‘Self
Cal’
is
shown
in
the
display.
Salinity
Compensation
1.
With
the
unit
ON,
momentarily
press
the
CAL/RECALL
button
twice
in
quick
succession
(‘SAL’
is
shown
in
the
lower
temperature
display).
2.
Momentary
press
the
MODE/HOLD
button.
Each
press
of
the
MODE/HOLD
button
increases
the
compensation
by
1ppt
(part
per
thousand);
the
available
range
is
0
to
50ppt.
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