User Guide

CALIBRATION

If repeated measurements differ more than an acceptable value, check if the meter

calibration status by measuring a standard solution.

Anyway, it is recommended to perform a monthly calibration of the meter, or more

frequently for greatest accuracy.

To check the date of last calibration, press and hold the DATE/ key down for few

seconds.

CALIBRATION PROCEDURE

• Turn the meter on and wait for the

display to show “----”.

• Press the CAL key once, the “CAL”

message will blink on the display for

about 6 seconds, then the calibration

mode stops.

• While the “CAL” message is still blinking, press CAL again. The instrument is

now in the calibration mode and a “CL” will appear on the lower part of the

display.

The date of calibration can be edited

now by simply pressing the DATE/

key. To scroll to the correct number press

the READ/ key.

The first blinking parameter is the month, on the left hand of the display

(MM.DD).

• To confirm the displayed data values

and to go to the next step, press the

CAL key once. A blinking “ZERO” mes-

sage will appear.

• Fill the measurement cuvette with HI 93703-0

standard (@ ZERO FTU, or turbidity-free water).

Note: In order to minimize any error introduced by the

cuvette, it is recommended to use the same cuvette during calibration and for

measurements.

• Insert the cuvette with the ZERO FTU

standard solution (or turbidity-free

dilution water) into the measurement

cell and press the CAL key.