Endress+Hauser CCS120D, Operating Instructions Manual

Page: 24 / 44

Commissioning CCS120D
24 Hauser
7 Commissioning
7.1 Function check
Prior to initial commissioning, ensure that:
• The sensor is correctly installed.
• The electrical connection is correct.
• There is sufficient electrolyte in the membrane cap and the transmitter is not displaying a
warning about electrolyte depletion.
Please note the information on the safety data sheet to ensure safe use of the electrolyte.
Always keep the sensor moist after commissioning.
L
WARNING
Escaping process medium
Risk of injury from high pressure, high temperatures or chemical hazards
‣
Before applying pressure to an assembly with cleaning system, ensure that the system has
been connected correctly.
‣
Do not install the assembly in the process if you cannot reliably establish the correct
connection.
7.2 Filling the membrane cap with electrolyte
Fill the membrane cap with electrolyte
The sensor is dry when delivered from the factory.
‣
Fill the membrane cap with electrolyte before commissioning the sensor →  20.
7.3 Sensor polarization
The voltage applied by the transmitter between the working electrode and counter electrode
polarizes the surface of the working electrode. Therefore, after switching on the transmitter
with the sensor connected, you must wait until the polarization period has elapsed before
starting calibration.
Polarization time: →  36
7.4 Sensor calibration
Reference measurement according to the DPD method
To calibrate the measuring system, carry out a colorimetric comparison measurement
according to the DPD-1/DPD-3 method. Chlorine reacts with diethyl-p-phenylendiamine
(DPD) producing a red dye, the intensity of the red color being proportional to the chlorine
content. Alternatively, the DPD 4 method can also be used.
Measure the intensity of the red color using a photometer (e. g. PF-3→  34) . The
photometer indicates the chlorine content.