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10.2
Sampling from the Bypass Fitting
3.
Plug the mains plug into the sockets provided and switch on
the mains voltage.
4.
Check the operating conditions, as described in the operating
instructions for the sensors, as follows:
Flow
n
Pressure
n
Temperature
n
pH
n
Concentration of feed chemical
n
Adjust these values so that the values are within the sensor's
specification.
5.
To condition the amperometric sensors, make sure that there
is electrical power to the sensors, that there is a flow of
chemical to be measured and that the appropriate run in
period given in the operating instructions for the sensor has
expired.
ð The sensor signal should be stable in terms of time after
conditioning.
Only then can the measuring point be calibrated. The
operating conditions have to remain as constant as pos‐
sible during this.
6.
Calibrate the measuring points, as described in the operating
instructions supplied for the respective controller fitted.
7.
The operating instructions supplied for the respective sensor
fitted provide detailed information on commissioning the sen‐
sors.
Bleeding of the DLG
Remove sufficient sample water before taking a
sample to fully bleed the measuring point with
measuring and control stations fitted with DLG
bypass fitting. There should be no air in the bypass
fitting during sampling.
Sampling for calibration
When taking a sample to calibrate a sensor, make
sure that sufficient sample water is removed before
sampling in order to rule out particles of dirt, for‐
eign bodies etc. in the actual sample. Properly dis‐
pose of the sample water that is removed.
The sampling points are labelled on the measuring and control
plate. The extraction of sample water is only permitted at these
sampling points. The extraction of sample water at other points on
the measuring and control station can lead to incorrect results, for
instance during calibration.
Starting-up Sensors
49
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