9.1.2
2-point pH sensor calibration
(CAL)
Correct sensor operation
–
Correct measuring and metering
is only possible if the sensor is
working perfectly
–
Refer to the sensor's operating
instructions
–
2-point calibration is strongly rec‐
ommended and is preferable to
other methods
–
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
Determining buffer detection
There are 2 methods of buffer detec‐
tion with 2-point calibration.
[Requirement]: you have to select 2
buffers from the 4 possible buffer sets
for this. Adhere to the selected order,
e.g. buffer value 1: pH 7 and buffer
value 2: pH 4 for calibration.
–
ProMinent
®
(pH 4; 7; 9; 10)
–
NBS/DIN 19266 (pH 1; 4; 7, ; 9)
–
DIN 19267 (pH 1;4; 7; 9; 13)
–
Merck + Riedel
®
(pH 2; 4; 7; 9;
12)
The buffer sets vary with regard to
their pH values and temperature
dependencies configured in the con‐
troller. The pH values for the different
temperatures are also printed on the
buffer containers.
[Manual]: enter the buffer value with
the associated temperature into the
controller.
–
The pH values of the buffer solu‐
tion at temperatures that deviate
from 25 °C are displayed in a
table on the label of the buffer
bottle.
Select the buffer you require.
Calibration
66
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