Determining buffer detection
There are 2 methods of buffer detection 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
controller. The pH values for the different tempera‐
tures 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 solution at temper‐
atures that deviate from 25 °C are displayed in
a table on the label of the buffer bottle.
Select the buffer you require.
CAL pH
Buffer manufacturer
Calibration process
A1512
Manual
Buffer detection
2 point
Manual
Buffer value 1
Buffer value 2
Buffer temperature
ProMinent
pH 7
pH 4
Buffer temperature
25.0 °C
Fig. 19: Example: Display in[CAL Setup]
Buffer used
Dispose of the used buffer solution. For more infor‐
mation: refer to the buffer solution safety data
sheet.
Valid calibration values
Valid calibration:
–
Zero point -60mV…+60 mV
–
Slope 55 mV/pH…62 mV/pH
You need two test containers with buffer solution for calibration.
The pH values of the buffer solutions should be at least 2 pH
values apart. Thoroughly rinse the sensor with water when
changing the buffer solution.
Continuous display ➨
Start Up
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