SICK LBV 321 NAMUR, Operating Instructions Manual

Page: 60 / 72

7 M
aintenance and fault recti
fi
cation
7 . 1 M
aintenance
I f the instrument is used properly
,
no special maintenance is required
in normal operation
.
7
.
2
F
ault recti
fi
cation
T he operator of the system is responsible for taking suitable measures
to rectify faults
.
LBV
321
o
ff
ers maximum reliability
.
N evertheless
,
faults can occur
during operation
.
T hese may be caused by the following
,
e
.
g
.:
l
S ensor
l
P rocess
l
V oltage supply
l
S ignal processing
T he
fi
rst measure to be taken is to check the output signal
.
I n many
cases
,
the causes can be determined this way and the faults recti
fi
ed
.
E
rror
C
ause
R
emoval
LBV
321
signals
"
covered
"
without
being submerged
(
over
fi
ll protection
)
LBV
321 signals
"
uncovered
"
when
being submerged
(
dry run protec
-
tion
)
O perating voltage
too low
C heck operating voltage
E lectronics de
-
fective
P ress the characteristic reversal
switch
.
I f the instrument then changes
the mode
,
the vibrating element may
be covered with buildup or mechan
-
ically damaged
.
S hould the switching
function in the correct mode still be
faulty
,
return the instrument for repair
.
P ush the characteristic reversal
switch
.
I f the instrument then does not
change the mode
,
the electronics
module may be defective
.
E xchange
the electronics module
.
U nfavourable in
-
stallation location
M ount the instrument at a location in
the vessel where no dead zones or air
bubbles can form
.
B uildup on the vi
-
brating element
C heck the vibrating element and the
sensor if there is buildup and remove
it
.
R
eaction when malfunc
-
tions occur
C
auses of faults
F
ault recti
fi
cation
C
hecking the switching
signal
24
LBV
321
• -
NAMUR
7
M aintenance and fault recti
fi
cation
39163
-
EN
-
110621