SERVICE
6
35
OPTISYS CL 1100
www.krohne.com
03/2016 - 4002492302 - MA OPTISYS CL 1100 R03 en
6.1 Maintenance
6.1.1 Automatic sensor cleaning
The sensor is equipped with the patented automatic sensor cleaning (ASR, patent Dr. A. Kuntze).
An electrochemical process (electrolysis) causes outgassing of hydrogen and oxygen on the
measuring electrodes, which can remove 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.
Hold time
Due to the cleaning the polarisation layer becomes disturbed. To prevent wrong measuring
results caused by the cleaning, the hold time can be adjusted between 1 and 60 min (setup >
process input A > cleaning > clean hold). During the hold time, the sensor value is frozen by the
signal converter. If measurement after cleaning has not approximated to 10% of old value, hold
time is retriggered up to two times.
Configurations regarding the cleaning can be made in menu:
setup > process input A > cleaning
•
time
•
control input
•
manual
•
off
Figure 6-1: Automatic sensor cleaning ASR
1
Ceramic diaphragm
2
Gold electrodes
3
Dirt deposits removed by ASR
4
Diaphragm
