User Manual

• At the end of the measurement, the third calibration

point (100 NTU) 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 cuvet.

• Place the 100 NTU standard cuvet (or the

prepared formazin standard) into the holder,

with the cuvet mark aligned with the sign on

the instrument.

• Close the lid and press READ

. The display

will show blinking dashes and the icons for

cuvet, detectors and lamp will appear during

measurement.

• At the end of the measurement, the fourth

calibration point (750 NTU) 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 cuvet.

• Place the 750 NTU standard cuvet (or the prepared

formazin standard) into the holder, with the cuvet

mark aligned with the sign on the instrument.