2-Point Ph Sensor Calibration (Cal) - ProMinent DULCOMETER Assembly And Operating Instructions Manual

Calibrating the controller
2-point pH sensor calibration
9.1.2
(CAL)
Correct sensor operation
Correct measuring and metering
–
is only possible if the sensor is
working perfectly
Observe the sensor operating
–
instructions
The carrying out of a 2-point cali‐
–
bration is strongly recommended
and is to be preferred to other
methods
For calibration the sensor must
–
be removed and refitted in the in-
line probe housing. To do this,
observe the operating instructions
of your in-line probe housing
Measuring and control behaviour
of the controller during calibration
During calibration the actuating out‐
puts are deactivated. Exception: a
basic load or a manual control vari‐
able has been set. This remains
active. The measured value output
[standard signal output mA] is frozen,
corresponding to its settings in the
mA output menu.
When calibration/testing has been
completed successfully, all of the
error checks relating to the measured
value are restarted. The controller
saves all the determined data for zero
point and slope upon a successful
calibration.
64
Used buffer
Dispose of the used buffer solution.
For more information: see buffer solu‐
tion safety data sheet.
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 calibration. The pH values
of the buffer solutions must be at least 1.5
pH units apart. Thoroughly rinse the
sensor with water when changing the
buffer solution.
Continuous display ➨
CAL pH
Select calib. proc. 2 point
Asymmetry 0.0 mV
Zero point 7.00 pH
Slope -59.16 mV/pH
% Slope 100 %
CAL Setup
continue with <CAL>
Fig. 33: pH sensor calibration (CAL)
1. Then press
2. Immerse the sensor in test con‐
tainer 1 which contains the buffer
solution (e.g. pH 7). When doing so
gently move the sensor
3. Then press
ð Calibration is running .
[Please wait!] flashes.
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A1016