10.3.2 2-point fluoride sensor cal‐
ibration (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
Material required for calibration of fluoride sen‐
sors:
n Two test containers with calibrating solu‐
tion
Measuring and control behaviour
of the controller during calibration
During calibration the actuating outputs
are deactivated. Exception: a basic
load or a manual control variable 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 com‐
pleted 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.
Used calibration solution
Dispose of the used calibration solu‐
tion. For more information: see calibra‐
tion solution safety data sheet.
Two test containers with a calibration solution
are required for calibration. The fluoride content
of the calibrating solutions should be at least
0.5 ppm F
-
apart from each other. The sensor
should be rinsed thoroughly with fluoride-free
water when changing the calibrating solution.
Calibration
99
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