User Guide

14
CALIBRATION MODE
The calibration mode allows to calibrate the pH/ORP input,
temperature input and 4-20 mA analog outputs.
The controller is factory calibrated for all these parameters.
Periodical calibration of the instrument is recommended, in
particular when greatest accuracy is required and at least bi-
yearly.
It is possible to calibrate the electrode over only one point,
but it is always good practice to perform a 2-point calibra-
tion.
To enter the calibration mode press the CAL key.
Enter the correct password and press the CFM key. If a wrong
password is entered, the instrument returns to the previous
mode.
Note If the meter is set as an ORP controller (setup item G.00), the
pH calibration, pH reading offset adjustment, and pH offset
and slope are not available. If the meter is selected as a pH
controller, no ORP calibration can be selected.
Note Any calibration procedure can be aborted at any time by
pressing the CAL key, and the instrument returns to the previ-
ous mode.
The pH/ORP controller can be calibrated through a one-
point or two-point calibration.
The pH calibration can not be performed if the pH electrode
is broken or leaking or the reference electrode is broken or
dirty and an error is active. The ORP calibration can not be
performed if the “Reference electrode broken or dirty” error is
active. For pH calibration the temperature probe should be
connected to the process meter.
All calibrations refer to the process controller. No calibration
for the Digital Transmitter can be performed by the process
controller, but the Digital Transmitter Calibrator must be used
for that.