ISC/Oldham OLC20 Series - Technical Characteristics of OLCT20;20 D and OLCT40;40 D; Electric Power Supply; Output Signal

24
I
I
X
X
.
.
T
T
e
e
c
c
h
h
n
n
i
i
c
c
a
a
l
l
c
c
h
h
a
a
r
r
a
a
c
c
t
t
e
e
r
r
i
i
s
s
t
t
i
i
c
c
s
s
o
o
f
f
O
O
L
L
C
C
T
T
2
2
0
0
/
/
2
2
0
0
D
D
a
a
n
n
d
d
O
O
L
L
C
C
T
T
4
4
0
0
/
/
4
4
0
0
D
D
1. Electric power supply
A) Explosion-proof version
Power supply: voltage on detector terminals = 15 V to 30 V
Power consumption: 3-wire version = 100 mA
2-wire version = 25 mA
Load resistance: maximum resistance = 250 ohms
Line length (shielded cable): 3-wire version = 1 km as 3x 1.5 mm
2
(32 ohms in
loop mode)
2-wire version = 4 km as 3x 1.5 mm
2
(32 ohms in
loop mode)
B) Intrinsic safety version
Characteristics of ZENER barrier: 28 V - 300 ohms
Supply voltage for barrier: 19 V to 26 V
Voltage on detector terminals: 10 V to 26 V
Power consumption: 25 mA max
Load resistance: 47 ohms
Line length (shielded cable): 1 km as 3x 1.5 mm
2
(32 ohms in loop mode)
2. Output signal
Source mode current = 4-20 mA
Max. current: 25 mA
Fault current: <1 mA