Endress+Hauser Liquisys M CUM253 - Page 52

Commissioning Liquisys M CUM223/253
52 Endress+Hauser
Timer for cleaning function
This function includes a simple cleaning option. You can set the time interval after which
cleaning should start. So you can only select a constant interval sequence.
Other cleaning functions are available for selection in conjunction with the Chemoclean
function (version with four contacts, see "Chemoclean function" section).
Timer and Chemoclean do not work independently of one another. While one of the
two functions is active, the other cannot be started.
a0006794
Fig. 29: Correlation of cleaning time, pause time and hold dwell period
A
B
0
1
Wiper and/or spray cleaning system
Hold function
Inactive
Active
t
0
t
1
t
2
-t
1
t
3
-t
2
t
4
-t
3
Normal mode
Cleaning start
Cleaning time
Clean hold dwell period (0 to 999 s)
Pause time between two cleaning intervals
(1 to 7200 min)
A
B
1
0
t
1
t
2
1
0
t
3
t
t
t
4
t
0