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• At the end of the measurement, the third calibra‑
tion point (100 FNU) is displayed on the primary
LCD, “CAL P.3” on the secondary LCD, and “READ”
tag will blink.
• At this moment it is possible to exit calibration
by pressing CAL. The instrument will memorize
the two‑point calibration data and will return to
measurement mode.
THREE-POINT CALIBRATION
To perform a three‑point calibration, continue the
procedure with the following steps:
• Remove the second standard cuvette.
• Place the 100 FNU standard cuvette (or the
prepared formazin standard) into the holder,
with the cuvette mark aligned with the sign on
the instrument.
• Close the lid and press READ . The display will
show blinking dashes and the icons for cuvette, de‑
tectors and LED will appear during measurement.
• At the end of the measurement, the fourth calibra‑
tion point (750 FNU) is displayed on the primary
LCD and “CAL P.4” on the secondary LCD.
• At this moment it is possible to exit calibration by
pressing CAL. The instrument will memorize the
three‑point calibration data and will return to
measurement mode.
FOUR-POINT CALIBRATION
To perform a four‑point calibration, continue the
procedure with the following steps:
• Remove the third standard cuvette.
• Place the 750 FNU standard cuvette (or the
prepared formazin standard) into the holder,
with the cuvette mark aligned with the sign on
the instrument.
