+
-
V
mA
12... 20V
4... 20mA
1
2
1
2
3
4
F
ig
.
8
:
C
onnection of a multimeter
1
SU
501
E
x signal conditioning instrument
2
S
ensor
l
S
ensor not connected correctly
à
M
easure the voltage on the connection cable
I
n
E
x systems
,
make sure that the
E
x protection is not
in
fl
uenced by the measuring instruments used
.
à
T
he terminal voltage of the sensor is at least
12
V
in
normal condition
?
T
he red failure
LED
of the signal conditioning instrument
lights
l
C
urrent value
<
2
m
A
à
M
easure the current value on the signal cable to the
sensor
1
C
heck all connections and connection cables to the sensor
T
he voltage should be approx
.
17
…
20
V
I
f the value is below
17
V
,
probably the signal conditioning
instrument is defective
.
E
xchange signal conditioning instrument or return it for
repair
2
I
f the red failure lamp continues to light
,
separate the
sensor from the connection cable and connect a resistor of
1
k
O
hm instead on the signal conditioning instrument
T
he signal conditioning instrument is defective if the failure
lamp continues to light
SU
501
E
x
-
S
ignal conditioning instrument
21
M
aintenance and fault recti
fi
cation
27953
-
EN
-
050616
