8
EC170-EU-EN V1.1 7/13
Calibration
Calibration
Preparation
and
Considerations
The
user
must
first
determine:
1.
The
best
calibration
schedule
for
the
application
at
hand.
2.
What
calibration
standard
to
use.
Calibration
Schedule
Calibration
is
necessary
and
should
be
performed
regularly.
If
measuring
in
the
mid
‐
ranges
calibrate
the
meter
at
least
once
per
month
and
soak
the
probe
deionized
or
for
15
minutes
before
each
use.
If
measuring
in
extreme
temperature
environments,
or
at
the
low
end
of
the
measurement
range,
calibrate
the
meter
at
least
once
per
week.
Selecting
a
Calibration
Standard
For
best
results
select
a
calibration
standard
closest
to
the
expected
sample
value.
Alternatively,
use
a
calibration
solution
value
that
is
approximately
2/3
of
the
expected
full
scale
measurement
range.
Remember
not
to
re
‐
use
calibration
solutions;
contaminants
in
the
solution
will
affect
the
calibration
and
the
accuracy.
Salinity
Calibration
Procedure
1.
Insert
the
probe
into
deionized
or
distilled
water
for
approximately
30
minutes
to
rinse
the
probe.
2.
Select
the
Sodium
Chloride
standard
that
is
closest
to
the
expected
measurement
range.
3.
Fill
two
separate
and
clean
sample
cups
with
the
standardizing
solution
to
a
depth
of
at
least
3
cm
(1.2”)
each.
4.
Switch
the
meter
ON.
5.
Rinse
the
probe
in
one
of
the
sample
cup
solutions,
gently
stirring
the
probe.
Rinsing
could
remove
contaminants
that
could
affect
calibration
and
cause
measurement
errors.
6.
Dip
the
rinsed
probe
into
the
other
sample
cup
solution.
Tap
or
move
the
electrode
in
the
sample
to
dislodge
air
bubbles.
Let
the
probe
stabilize
to
the
solution
temperature.
7.
Press
and
hold
the
HOLD/CAL
button
(approximately
2
seconds)
until
the
salinity
value
and
the
‘
CAL
’
icon
begin
flashing
on
the
LCD.
8.
Use
the
arrow
buttons
to
adjust
the
displayed
value
to
match
the
value
of
the
standard
solution.
The
Salinity
reading
can
be
adjusted
±30%
from
the
detected
value.
Values
differing
more
than
±30%
from
the
detected
value
indicates
that
the
electrode
needs
to
be
cleaned.
9.
When
the
CAL
icon
stops
flashing,
press
the
SET
button
momentarily
to
confirm
the
value.
The
meter
will
then
return
to
the
normal
measurement
mode.
10.
Note
that
in
cases
where
the
Salinity
reading
is
outside
the
±30%
window,
the
meter
display
may
freeze
and
not
allow
the
user
to
return
to
the
normal
operating
mode.
In
this
case,
remove
one
of
the
batteries
to
switch
the
meter
OFF
and
do
not
use
the
meter
again
until
the
electrode
has
been
cleaned
or
replaced.
www.
GlobalTestSupply
.com
Find Quality Products Online at:
