ProMinent DULCOTROL DWCa Assembly And Operating Instructions Manual page 76

Calibrating the controller diaLog DACb
76
Defining buffer detection
There are 2 buffer detection options with 2-point
calibration.
[Presetting]: select 2 buffers from the 4 possible
buffer sets. During calibration, adhere to the
selected order e.g. Buffer value 1: pH 7 and Buffer
value 2: pH 4:
ProMinent
–
– NBS/DIN 19266 (pH 1; 4; 7, ; 9).
DIN 19267 (pH 1;4; 7; 9; 13).
–
Merck + Riedel
–
The buffer sets differ in their pH values and tem‐
perature dependencies set in the controller. The
pH values at 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 solution, at temper‐
–
atures other than 25°C, are printed in a table
on the label of the buffer bottle.
Select the available buffer.
CAL pH
Calibration process
Buffer detection
Buffer manufacturer
Buffer value 1
Buffer value 2
Buffer temperature
Buffer temperature
Fig. 36: Example: Display in [CAL-Setup]]
Used buffer
Dispose of the used buffer solution. For more infor‐
mation: refer to the material safety data sheet for
the buffer solution.
Valid calibration values
Valid calibration:
Zero point -60mV...+60 mV
–
Slope 55 mV/pH...62 mV/pH
–
Two test containers with a buffer solution are required for calibra‐
tion. The pH values of the buffer solutions must be at least 2 pH
values apart. Thoroughly rinse the sensor with water when
changing the buffer solution.
Continuous display ➨ .
(pH 4; 7; 9; 10). (default setting)
®
(pH 2; 4; 7; 9; 12).
®
2 point
Manual
ProMinent
pH 7
pH 4
Manual
25.0 °C
A1512