SICK LBV 331, Руководство по эксплуатации

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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
331
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
331
signals
"
covered
"
without
being submerged
(
over
fi
ll protection
)
LBV
331 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 mode switch
.
I f the instru
-
ment then changes the mode
,
the
vibrating element may be covered with
buildup or mechanically damaged
.
S hould the switching function in the
correct mode still be faulty
,
return the
instrument for repair
.
P ress the mode switch
.
I f the instru
-
ment then does not change the mode
,
the electronics module is 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
mounds 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
22
LBV
331
• -
transistor
(
NPN
/
PNP
)
7
M aintenance and fault recti
fi
cation
39165
-
EN
-
110621