Calibration
9.2
Calibrating the ORP Sensor
Selecting the calibration
9.2.1
process for ORP
Selecting the calibration process
There are two calibration processes avail‐
able for calibrating the controller:
1-point (with buffer solution)
n
Data input
n
1.
Continuous display ➨
CAL ORP
Offset
Last calibration
CAL setup
Calibration process
Pot. equalisation
continue with <CAL>
Fig. 43: [ORP] calibration menu
ð The calibration menu is dis‐
played.
2.
Use
to select the Setup menu or
start calibration by pressing
Selecting the calibration process
3.
[CAL Setup] : Press
ð The menu for selecting the cali‐
bration process appears.
4.
Using the arrow keys select the
required menu item
[Calibration process] and press
ð The input window appears.
5.
Use the arrow keys to select the
calibration process and press
6.
Continue with
76
0.0 mV
13:26:11
11/04/2013
1 point
No
A1027
ð You can now start your chosen
calibration process.
1-point calibration of ORP
9.2.2
sensor (CAL)
Correct sensor operation
Correct measuring and metering
–
is only possible if the sensor is
working perfectly
Refer to the sensor's operating
–
instructions
Remove the sensor from the in-
–
line probe housing and re-fit it for
calibration. To do this, refer to the
operating instructions for your in-
line probe housing
ORP sensor calibration
The ORP sensor cannot be cali‐
brated. Only an [OFFSET] deviation
of magnitude ± 40 mV can be set and
thus compensated. If the ORP sensor
deviates by more than ± 40 mV from
the reference value, then it must be
checked in accordance with the
requirements of the sensor operating
instructions.