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TWO-POINT CALIBRATION
• Turn the instrument on by pressing ON/OFF.
When the LCD displays dashes, the instrument
is ready.
• Enter calibration mode by pressing CAL.
The display will show “CAL P.1” and no sug‑
gested value. This first point is used to check
the optical system.
• Place the <0.1 FNU standard cuvette into
the holder and ensure that the cuvette mark is
aligned with the sign on the instrument top.
• Close the lid and press READ . The display
will show blinking dashes and the icons for
cuvette, detectors and LED will appear during
measurement. Alternatively, press LOG/CFM to
skip the first point.
• The second calibration point (15.0 FNU) is then
displayed on the primary LCD, “CAL P.2” on the
secondary LCD, and “READ” tag will blink.
• If the prepared formazin is used, edit the
displayed value by pressing UP or DOWN keys
until the display shows the correct value.
• Remove the first standard cuvette and place the
15.0 FNU standard cuvette (or the prepared
one) into the holder and ensure that the cuvette
mark is aligned with the sign on the instrument
top.
• Close the lid and press READ . The display
will show blinking dashes and the icons for
cuvette, detectors and LED will appear during
measurement.
or
