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Measured Variables and Operating Menus for Amperometric Sensors
Necessity of calibrating the zero
point
Calibration of the zero point is not
generally necessary. Calibration of
the zero point is only necessary if the
sensor is operated at the lower limit of
the measuring range or if the 0.5 ppm
sensor version is used.
During the calibration, the
DULCOMETER
®
D1Cb / D1Cc sets the
control outputs to "0". Exception: a basic
load or a manual control value has been
set, this remains active. The mA standard
signal outputs are frozen. The measured
value frozen at the start of calibration is
suggested as a DPD value. The DPD
value can be set using the arrow keys.
Calibration is only possible if the DPD
value is ≥ 2 % of the measuring range of
the sensor.
76
7.6.2
Calibration of Zero Point and
Slope
NOTICE!
Prerequisites for correct calibration of
the sensor slope
–
The DPD method required by the
feed chemical employed will be
used
–
The run in period for the sensor
has been adhered to
–
There is permitted and constant
flow at the in-line probe housing
–
There is temperature balance
between the sensor and the
sample water
–
There is a constant pH value in
the permitted range
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