DO600-en-GB_V7.4 12/16
7
Clearing
Stored
Readings
1.
With
the
unit
ON
press
and
hold
the
ON/OFF
button
for
4
seconds
2.
When
“clr”
is
shown
in
the
main
display
the
memory
is
cleared.
Measurement
and
Display
Considerations
The
DO600
uses
a
polarographic
sensor,
which
consumes
oxygen
at
the
sensing
surface.
This
requires
a
constant
movement
of
the
sample
across
the
membrane
to
maintain
a
constant
dissolved
oxygen
level.
It
is
recommended
that
the
probe
be
moved
in
the
sample
as
the
measurement
is
made,
or
if
in
a
laboratory
environment,
the
sample
be
stirred
using
a
stir
plate.
If
you
are
measuring
DO
in
a
small
container,
the
probe
will
consume
oxygen
as
it
is
measuring
and
the
measurement
value
will
continue
to
go
lower.
If
the
unit
appears
to
be
locked
(display
frozen).
It
is
possible
that
the
Data
Hold
mode
has
been
inadvertently
accessed
by
a
press
of
the
MODE/HOLD
button
(HOLD
will
be
displayed
in
the
bottom
left
of
the
LCD).
Simply
press
the
MODE/HOLD
button
again
or
turn
the
meter
off
and
back
on
again.
If
the
meter
does
latch
up
and
no
button
presses
revive
it,
remove
the
batteries
and
restart.
For
maximum
accuracy,
allow
sufficient
time
for
the
temperature
of
the
probe
to
reach
the
temperature
of
the
sample
before
taking
a
reading.
This
will
be
indicated
by
a
stable
temperature
reading
on
the
display.
Membrane
Maintenance
First
use
When
you
first
go
to
use
a
new
meter,
you
will
need
to
remove
the
membrane
cap
and
replace
it
with
a
new
cap
filled
with
refill
solution.
Please
Note:
The
installation
of
a
bonded
cap
causes
the
membrane
to
be
tightly
streched
over
the
cathode.
Once
a
bonded
cap
is
removed
reinstallation
is
not
possible
as
the
membrane
will
no
longer
be
properly
streched
over
the
cathode.
Storage
The
sponge
contained
in
the
protective
electrode
cap
should
be
only
moistened
(not
soaked)
with
(distilled
water)
or
clean
tap
water.
