Hanna Instruments HI 95725C User Manual

Page 12

FACTORY CALIBRATION RESET
It is possible to restore factory calibration:

DATE INPUT

• Keep READ pressed to scroll to the desired

month number (01-12).

• When the correct month has been set, press

ZERO/SET to confirm.

• Now the display will show the day number

blinking. Keep READ pressed to scroll to the
desired day number (01-31).

Note: it is possible to change from day to month

and vice versa by pressing ZERO.

• When both the day and month have been

selected, hold CAL CHECK

for three seconds

to store date and calibration values. The
instrument will show for one second “Stor”,
to confirm that the new calibration data has
been accepted.

• The instrument will return automatically to

the measurement mode by displaying "Cl"
on the LCD.

• Enter the

calibration mode by holding CAL

CHECK

for three seconds

• Hold ZERO/SET for 10 seconds. The display

will show for 2 seconds “F.CAL” and "Cl"
appears. The factory calibration is
automatically restored and the instrument is
ready for measurement.

• Press ZERO/SET and “SIP” will blink on the

display.

• After a few seconds the display will

show “-0.0-”. The meter is now zeroed and
ready for calibration.

• Remove the cuvet and place the CAL CHECK™

Standard HI 95725-11 Cuvet

B into the

holder. Ensure that the notch on the cap is
positioned securely into the groove.

• Press READ and “SIP” will blink during

measurement.

• The instrument will show for three seconds

the CAL CHECK™ standard value.

Then the date of last calibration (e.g.:
“01.08”) appears on the display, or “01.01”
if the factory calibration was selected. In
both cases the number of the month is
blinking, ready for date input.

Note: if the display shows “ERR” the calibration procedure failed. Verify that both CAL CHECK™

Standards HI 95725-11 Cuvets, A and B, are free from fingerprints or dirt and that they
are inserted correctly.