LF 170
Operation
105
ba54104e09
11/2010
4.6.3
Timer for external sensor cleaning system
Function
The cleaning function enables the timing of a sensor cleaning system
through one relay of the monitor. The relay always works as a closer
(normally open).
Setting table for sensor cleaning:
Note
No checking/adjustment of the cell constant is possible during the
cleaning process (
tc
) and the adjustment duration (
th
). If a cleaning
process is due during an ongoing checking/adjustment routine, the
start is delayed until the routine has ended. The starting time of all
subsequent cleaning processes is moved back according to the delay.
Setting
Selection/Values
Explanation
Tr
1 ... 168
(hours)
Time interval between two cleaning
processes
tc
10
...
300
(seconds)
Duration of the cleaning process. During the
cleaning process the measured value is
frozen.
th
10
...
900
(seconds)
Time for adapting the sensor to the
measured medium after the cleaning
process. During the adaptation period the
measured value is frozen.
Operating notes on setting the numerical
values:
– Set the first (flashing) digit with
<UP><DOWN>
and confirm with
<ENTER>
.
– Set the other digits in the same way.
– After the last digit you reach the next
setting
– After entry of all three values the setting of
the sensor cleaning is complete
