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If the CAL key is not
pressed, the upper dis-
play will show “----”, in-
dicating that calibration
mode was not entered. In which case, hold
down the ALT and CAL keys together for 3
seconds to restart the procedure.
After entering the cali-
bration mode, the dis-
play will show the first
point of the previous
calibration. The most
significant digit will also be blinking.
Using the , ,
keys, set the turbidity of
first calibration standard (from 0.00 to 50.0 NTU).
Insert the standard vial into the cuvet holder
and ensure that the notch is positioned se-
curely into the groove. Press the
key. The
display will indicate Sample In Progress (SIP).
After the first calibra-
tion point is memo-
rized, the LCD will indi-
cate the second point
of the previous calibration with the most sig-
nificant digit blinking.
Using the , ,
keys, set the turbidity of the
second calibration standard (from 0.00 to 50.0
NTU). Insert the standard into the cuvet holder
and make sure that the notch is positioned
securely into the groove. Press the
key.
The display will indicate “SIP” again.
The display will blink
“-Lt-” for several sec-
onds, indicating that the
LED is being adjusted
for the turbidimetric
channel.
Afterwards, a sequence of numbers between
-511 to 512 will appear on the upper part of
the LCD indicating different levels of LED light
intensity.
In approximately one minute, the adjustment
will be made and the calibration data stored
in the non-volatile memory.
The display will show four
dashes again indicating
the end of the span cali-
bration procedure.
Press the ALT and CAL
keys together again to
leave the diagnostic mode.
Two-point customized calibration
To enter the turbidity calibration mode, the
meter should be in “tur-
bidity” mode.
Use the and keys
to set the lower level of
the LCD to “tr”.
To enter the calibration mode, press and hold
the ALT and CAL keys together for at least
three seconds. The upper display will start
flashing “CAL” for approximately 3 seconds.
To confirm entry into the calibration
mode, press the CAL key again
while “CAL” is blinking.
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