Calibration - ProMinent DULCOTEST CLT 1-mA-2 ppm Montage- Und Betriebsanleitung

Putting the sensor into operation
6.1

Calibration

CAUTION!
– Perform slope calibration following
the replacement of a diaphragm
cap or electrolyte.
– Repeat slope calibration at regular
intervals to ensure correct opera‐
tion of the sensor. The calibration
intervals are 1 week, depending
on the quality of the water.
– Avoid air bubbles in the sample
water. These air bubbles can
result in incorrect metering. Air
bubbles that adhere to the sensor
diaphragm may result in too low a
measured value and thus lead to
over-metering.
– Please note the applicable
national guidelines for calibration
intervals.
Requirements:
Constant flow in the bypass fitting.
–
Constant temperature of the
–
sample water.
Identical temperature of sample
–
water and sensor (wait approx. 15
minutes).
The sensor has been run in.
–
Constant pH value.
–
24
Zero point calibration:
If the sensor is operated with a ProMinent
measuring/control unit, then zero point calibra‐
tion is not generally necessary. However, per‐
form zero point calibration if you are using the
sensor at the lower threshold of the measuring
range.
Immerse the sensor in a bucket of clean
1.
water without disinfectant or oxidant
(e.g. commercially available still mineral
water).
Use the sensor to stir until the measured
2.
value on the measuring/control unit is
stable for 5 minutes.
Calibrate the measuring /control unit to
3.
zero in accordance with its operating
instructions.
Re-install the sensor in the bypass fitting
4.
(e.g. the DGMA; DLG III).
Slope calibration:
Immediately determine the disinfectant
1.
content of the sample water using a suit‐
able measuring kit (e.g. DPD 1).
Set the determined value on the meas‐
2.
uring/control unit in accordance with its
operating instructions.
Repeat calibration after one day to
ð
ensure that the sensor has reached
its maximum sensitivity (slope).