13
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
previous 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 calibra-
tion for the Digital Transmitter can be performed by the
process controller, but the Digital Transmitter Calibrator
must be used for that .
