KROHNE OPTISYS CL 1100 EN - Manual (Page 33)

SERVICE
6
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OPTISYS CL 1100
www.krohne.com 01/2013 - 4002492301 - MA OPTISYS CL 1100 R02 en
6.1 Maintenance
6.1.1 Cleaning
The sensor can be equipped with the patented automatic sensor cleaning (ASR, patent Dr. A.
Kuntze). An electrochemical process causes outgassing on the measuring electrodes, which can
dissolve even tough coatings such as lime deposits or grease. The ASR considerably increases
the maintenance interval of the sensor. This way, the sensor can stay in the measuring medium
until it reaches the end of its lifetime.
Configuring automatic sensor cleaning
• Choose setup > process input A > cleaning > cleaning 24 h periode.
• Select a cleaning period of 24 hours (once a day), 12 hours, or 8 hours (three times a day). To
deactivate automatic sensor cleaning, select off.
i The cleaning period starts at the time of configuration.
• If required, you can postpone the start time of the cleaning procedure (setup > process input A
> cleaning > start time) and adjust the hold time after each cleaning procedure ( setup >
process input A > cleaning > hold time [s]). During the hold time, the sensor value is frozen by
the signal converter.
• The cleaning procedure may also be started manually anytime by choosing setup > process
input A > cleaning > clean.
If necessary, the gold electrodes can be cleaned with a soft cloth. Mechanical cleaning should
not be performed too often since this will disturb the polarisation layer of the sensor.
Figure 6-1: Automatic sensor cleaning ASR
1 Ceramic diaphragm
2 Gold electrodes
3 Dirt deposits removed by ASR
INFORMATION!
Example: It was 3.00 pm when you configured automatic sensor cleaning with 24 hours as
cleaning period. As a result, the sensor will be cleaned once a day at 3.00 pm.
If you have specified a value in the start time submenu, for example "5", the cleaning time will be
postponed by 5 hours. The senor now is cleaned once a day at 8.00 pm.