Burkert Type 8111 - Manual (Page 22)

7 Maintenance and fault rectification
7 .1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
7 .2 Remove interferences
The operator of the system is responsible for taking suitable measures
to rectify faults.
LEVEL SWITCH 8111 offers maximum reliability. Nevertheless, faults
can occur during operation. These may be caused by the following, e.
g.:
l Sensor
l Process
l Voltage supply
l Signal processing
The first measure to be taken is to check the output signal. In many
cases, the causes can be determined this way and the faults rectified.
Error Cause Rectification
LEVEL
SWITCH 8111
signals "covered"
without being
submerged (over-
fill protection)
LEVEL
SWITCH 8111
signals "uncov-
ered" when being
submerged (dry
run protection)
Operating voltage
too low Check operating voltage
Electronics de-
fective Press the characteristic reversal
switch. If the instrument then changes
the mode, the vibrating element may
be covered with buildup or mechan-
ically damaged. Should the switching
function in the correct mode still be
faulty, return the instrument for repair.
Push the characteristic reversal
switch. If the instrument then does not
change the mode, the electronics
module may be defective. Exchange
the electronics module.
Unfavourable in-
stallation location Mount the instrument at a location in
the vessel where no dead zones or air
bubbles can form.
Buildup on the vi-
brating element Check the vibrating element and the
sensor if there is buildup and remove
it.
Reaction when malfunc-
tions occur
Failure reasons
Fault rectification
Checking the switching
signal
22 LEVEL SWITCH 8111 • with NAMUR output
7 Maintenance and fault rectification
32048
-EN
-120418