TB400-en-GB_V1.3 8/16
3
Measurement
Procedure
Calibration
1.
Ensure
that
the
meter
has
been
calibrated
prior
to
use.
2.
Refer
to
the
calibration
section
for
this
procedure.
Sample
Preparation
1.
Place
the
testing
liquid
into
the
supplied
sample
bottle
up
to
the
10mL
line
and
secure
the
cap
to
the
bottle.
2.
Clean
and
dry
the
outside
of
the
sample
cup
to
ensure
a
clean
surface.
Measurement
1.
The
meter
should
be
switched
OFF.
2.
Open
the
test
chamber
cover
and
Insert
the
testing
bottle
completely
into
the
chamber.
3.
Line
up
the
white
mark
of
the
testing
bottle
with
the
white
mark
on
the
edge
of
the
test
chamber.
4.
Close
the
chamber
cover
and
lock
it
in
place.
5.
Press
the
“POWER”
button
to
turn
on
the
meter.
6.
Momentarily
press
the
“TEST”
button.
The
display
will
flash
"tESt"
for
approximately
10
seconds
and
then
the
turbidity
value,
in
NTU
units,
will
be
displayed.
7.
Momentarily
press
the
OFF
button
to
turn
off
the
meter.
Data
HOLD
Press
the
“HOLD”
button
once
while
taking
a
measurement
to
freeze
the
value
on
the
display.
Press
“HOLD”
again
to
release
the
Data
Hold
function.
Data
Record
(MAX/MIN
Readings)
1.
The
data
record
function
records
the
MAX
and
Min
readings.
Press
"REC"
button
once
to
begin
data
recording.
The
LCD
will
display
the
"REC"
symbol.
2.
In
recording
mode
press
"REC"
once.
The
display
will
show
the
maximum
reading
and
"REC
MAX"
will
appear
on
the
LCD
display.
3.
Press
"REC"
button
once
again
and
"REC
MIN"
will
appear
on
the
LCD
along
with
the
minimum
reading.
4.
To
delete
the
MAX
or
MIN
value
press
"HOLD"
once.
The
LCD
will
display
"REC".
Auto
‐
Power
OFF
The
Auto
Power
OFF
feature
automatically
switches
the
TB400
OFF
10
minutes
after
the
last
key
press.
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