SICK LFV 330, Руководство по эксплуатации

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7
M aintenance and fault recti fi cation
7
.
1
M aintenance
W hen used as directed in normal operation
,
LFV
330
is completely
maintenance free
.
7 . 2 R ectify malfunctions
T he operator of the system is responsible for taking suitable measures
to rectify malfunctions
.
LFV
330
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
P ower 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
.
?
LFV
330
signals
"
covered
"
when the vibrating element is not
submerged
(
over
fi
ll protection
)
?
LFV
330
signals
"
uncovered
"
when the vibrating element is
submerged
(
dry run protection
)
l
O perating voltage too low
à
C heck operating voltage
l
E lectronics defective
à
P ress the mode switch
(
min
./
max
.).
I f the instrument 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
.
à
P ush the mode switch
.
I f the instrument then does not change
the mode
,
the electronics module may be defective
.
E xchange
the electronics module
.
à
C heck if there is buildup on the vibrating element
,
and if so
,
remove it
.
l
U nfavourable installation location
à
M ount the instrument at a location in the vessel where no dead
zones or air bubbles can form
.
R eaction when malfunc -
tions occur
C auses of malfunction
F
ault recti fi cation
C hecking the switching
signal
24
LFV
330
• -
contactless electronic switch
7
M aintenance and fault recti
fi
cation
35914
-
EN
-
091126