KROHNE OPTISENS CL 1100 EN - Manual (Page 35)

SERVICE
6
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OPTISENS CL 1100
www.krohne.com 01/2012 - 4001834501 - MA OPTISENS CL 1100 R01 en
Service
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 setup setup setup > process input A process input A process input A process input A > cleaning cleaning cleaning cleaning > cleaning 24 h periode cleaning 24 h periode cleaning 24 h periode cleaning 24 h periode.
• Select a cleaning period of 24 hours 24 hours 24 hours 24 hours (once a day), 12 hours 12 hours 12 hours 12 hours, or 8 hours 8 hours 8 hours 8 hours (three times a day). To
deactivate automatic sensor cleaning, select off off off off.
i The cleaning period starts at the time of configuration.
• If required, you can postpone the start time of the cleaning procedure (setup setup setup setup > process input A process input A process input A process input A
> cleaning cleaning cleaning cleaning > start time start time start time start time) and adjust the hold time after each cleaning procedure ( setup setup setup setup >
process input A process input A process input A process input A > cleaning cleaning cleaning cleaning > hold time [s] hold time [s] hold time [s] 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 setup setup setup > process process process process
input A input A input A input A > cleaning cleaning cleaning cleaning > clean clean clean 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
24 hours 24 hours 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
start time start time 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.
.book Page 35 Wednesday, February 1, 2012 11:58 AM