ProMinent DULCOMETER D1Cc - Page 77

Calibration of amperometric sensors:
slope (in the reduced and complete oper‐
ating menu)
The sensor is fitted, flushed with sample
water and connected electrically to the
DULCOMETER
®
D1Cb / D1Cc and run-in.
There has to be adequate feed chemical
in the sample water for calibration (> 2%
of the measuring range of the sensor).
Remove sample water directly at the
measuring point and determine the con‐
tent of metering medium in the sample
water in "ppm" using an appropriate refer‐
ence method (e.g. DPD, titration etc.).
Enter this value as follows at the
DULCOMETER
®
D1Cb / D1Cc:
1. Select Calibration menu. Then
press
ð
The current measured value
will now be frozen.
2. Take a sample of water and per‐
form a reference measurement
within 15 minutes
3. Select "DPD value" of unit to be
calibrated using the
key
4.
Continue with
5. If necessary, match the flashing
ppm value to the value determined
with the measurement using the
keys, , and
ð
The mA value of the sensor
shown in this display now cor‐
responds to the measured
value in "ppm".
6. Then press the following key twice
ð
The display now shows the
value determined for the zero
point and slope. Refer to the
Error Message table should an
error be dis‐
played. Ä Table on page 74
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.
Measured Variables and Operating Menus for Amperometric Sensors
77