7
M
aintenance and fault recti
fi
cation
7
.
1
M
aintenance
W
hen used as directed in normal operation
,
LBV
310
is completely
maintenance free
.
7
.
2
R
ectify malfunctions
T
he operator of the system is responsible for taking suitable measures
to rectify malfunctions
.
LBV
310
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
.
?
LBV
310
signals
"
covered
"
when the vibrating element is not
submerged
(
over
fi
ll protection
)
?
LBV
310
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 instrument may be 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 mounds can form
.
à
C
heck if the vibrating element is covered by buildup on the
socket
.
R
eaction when malfunc
-
tions occur
C
auses of malfunction
F
ault recti
fi
cation
C
hecking the switching
signal
LBV
310
• -
R
elay
(
DPDT
)
21
7
M
aintenance and fault recti
fi
cation
35919
-
EN
-
091126
