User Guide

• The pH calibration value will switch

to 7.00, the first digit starts blinking

and it is possible to change its value

simply using the  or  key.

• Once selected the first digit value, press the  key: the first

digit will be fixed and the second one will start blinking.

Pressing of the  key repeatedly will result on circularly

moving on the secondary LCD.

• When the desired calibration value is reached (must be

within 0.00 to 16.00 pH), press the CFM key to confirm

and the calibration will proceed as described above.

• If the selected value is outside boundaries, the confirma-

tion is not accepted and the first digit keeps blinking (waiting

for confirmation of a valid value).

Note If SETUP key is pressed instead of CFM, the calibration value

selection is aborted and the meter reverts back to a two-point

calibration.

ORP CALIBRATION

To perform ORP calibration it is necessary to connect an HI

931001 or HI 8427 simulator to the BNC socket.

The meter has to be set as ORP controller.

• Set item I.04 to “OFF” to disable the Matching Pin.

• A two-point calibration has to be performed: the first point

value is 0 mV and the second one can be chosen between

350 mV and 1900 mV.

• Enter the calibration mode, select the ORP calibration (use

the  and  keys to move through setup menu) and press

the CFM key.

• Set the HI 931001 or HI 8427 simulator to 0 mV.

• The primary LCD will display the cur-

rent mV measure and the secondary

LCD will show the first calibration

point (0 mV).