Commissioning; Function Check; Sensor Polarization; Sensor Calibration - Endress+Hauser CCS50D Operating Instructions Manual

CCS50D
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.
WARNING
L
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

Sensor polarization

The voltage applied by the transmitter between the cathode and anode polarizes the surface
of the cathode. Therefore, after switching on the transmitter with the sensor connected, you
must wait until the polarization period has elapsed before starting calibration.
To achieve a stable display value, the sensor requires the following polarization periods:
Initial commissioning
Recommissioning
7.3

Sensor calibration

Reference measurement according to the DPD method
To calibrate the measuring system, carry out a colorimetric comparison measurement in
accordance with the DPD method for chlorine dioxide. Chlorine dioxide reacts with diethyl-p-
phenylendiamine (DPD) to form a red dye, the intensity of the red color being proportional to
the chlorine dioxide content.
Measure the intensity of the red color using a photometer, e.g. PF-3 (→  41). The
photometer indicates the chlorine dioxide content.
If the photometer used indicates the presence of chlorine, follow the manufacturer' s
instructions to convert the chlorine content into the chlorine dioxide content.
Endress+Hauser
60 min.
30 min.
Commissioning
27