5
C
onnecting to power supply
5
.
1
P
reparing the connection
A
lways keep in mind the following safety instructions
:
l
C
onnect only in the complete absence of line voltage
I
n hazardous areas you should take note of the appropriate
regulations
,
conformity and type approval certi
fi
cates of the sensors
and power supply units
.
C
onnect the operating voltage according to the following diagrams
.
T
he oscillator with relay output is designed in protection class
1
.
T
o
maintain this protection class
,
it is absolutely necessary that the
ground conductor be connected to the internal ground terminal
.
T
ake
note of the general installation regulations
.
A
s a rule
,
connect
LBV
310
to vessel ground
(
PA
),
or in case of plastic vessels
,
to the next ground
potential
.
O
n the side of the housing there is a ground terminal
between the cable entries
.
T
his connection serves to drain o
ff
electrostatic charges
.
I
n
E
x applications
,
the installation regulations for
hazardous areas must be given priority
.
T
he data for power supply are speci
fi
ed in chapter
"
T
echnical data
"
.
T
he instrument is connected with standard two
-
wire cable without
screen
.
I
f electromagnetic interference is expected which is above the
test values of
EN
61326
for industrial areas
,
screened cable should be
used
.
U
se cable with round cross
-
section
.
A
cable outer diameter of
5
…
9
mm
(
0
.
2
…
0
.
35
in
)
ensures the seal e
ff
ect of the cable gland
.
I
f you are
using cable with a di
ff
erent diameter or cross
-
section
,
exchange the
seal or use a suitable cable gland
.
I
n hazardous areas
,
only use approved cable connections for
LBV
310
.
T
ake note of the corresponding installation regulations for
E
x
applications
.
5
.
2
C
onnection procedure
W
ith
E
x instruments
,
the housing cover may only be opened if there is
no explosive atmosphere present
.
P
roceed as follows
:
1
U
nscrew the housing cover
2
L
oosen compression nut of the cable entry
N
ote safety instructions
T
ake note of
safety instruc
-
tions for
E
x ap
-
plications
S
elect power supply
S
electing connection
cable
S
elect connec
-
tion cable for
E
x
applications
LBV
310
• -
R
elay
(
DPDT
)
15
5
C
onnecting to power supply
35919
-
EN
-
091126
