VEGA 9001 Safety barrier - Manual (Page 2)

2 Safety barrier type 9001
29181-EN-040115
1 Application and function
Safety barrier type 9001 is a passive compo-
nent. With galvanic separation, it converts a
non-intrinsically safe circuit into an intrinsically
safe circuit.
The term „intrinsically safe“ characterizes a
circuit in which the energy flow is limited and
stored capacitive and inductive energy is
secured in such a way that neither switching
operations nor nor short-circuits can ignite an
explosive mixture.
Safety barrier type 9001 takes over this func-
tion. It limits the energy flow, damps the ca-
pacitance C
a
and the inductance L
a
of the
output circuit and reduces the stored energy
reliably. Circuits secured in this way cannot
ignite explosive mixtures.
Operating Instructions
Example:
An indicating instrument is mounted in Ex-
areas and requires an intrinsically safe
0 … 20 mA current signal.
The existing 0 … 20 mA signal to the indicating
instrument however, is not intrinsically safe.
Safety barrier type 9001 is connected to the
signal cable to supply the indicating instru-
ment in Ex-area with an intrinsically safe 20 mA
signal. The safety barrier then provides on its
output an intrinsically safe 0 … 20 mA current
signal for the indicating instrument.
Note:
The capacitance C
a
and inductance L
a
of the
output circuit resulting from the indicating
instrument and the supply cable must not
exceed the stated limit values. The standard
wiring normally ensures these values.
2 Technical data
General
Installation position outside Ex-area on carrier rail
Operating temperature -20°C … +60°C
Storage and transport temperature -20°C … +75°C
Housing material Polyamide 6 GF
Cross-section area of conductor 1.5 mm 2 (terminals)
Protection acc. to IEC 60529
- terminals
IP 20
- housing IP 40
Weight 115 g
Approvals
- zone 1
Ex II C 1/2G [EEx ia/ib] IIC/IIB
Ex II 3G EEx ia II T4
- zone 2 [EEx ia] II C / [EEx ia] II B
Input circuit
Nominal voltage U
N
6 V DC
Zener voltage 8.6 V
Min. series resistance R
min
64 Ohm
Max. series resistance R
max
73 Ohm
Leakage current against earth at U
N
≤
1 µA
Output circuit
Short-circuit current I
K
≤
150 mA
Capacitance C
a
t EEx ia IIC
≤
6.2 µF
Inductance L
a
at EEx ia IIC
≤
1.3 mH
Capacitance C
a
at EEx ib IIB
≤
55 µF
Inductance L
a
at EEx ib IIB
≤
7 mH