VEGA 9130 Safety barrier - Manual (Page 2)

2 Safety barrier type 9130
1 Application and function
Safety barrier type 9130 is a passive compo-
nent. It converts a not-intrinsically safe circuit
without galvanic isolation into an intrinsically
safe circuit.
The term „intrinsically safe“ characterizes a
circuit in which the energy flow is limited and
capacitive as well as inductive energy storage
is saved such that neither switching com-
mands nor shortcircuits can ignite an explo-
sive mixture.
Safety barrier type 9130 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 saved energy
reliably. The saved circuits cannot ignite ex-
plosive mixtures.
Operating instruction
Example:
An indicating instrument is mounted in Ex-area
and requires an intrinsically safe 0 … 20 mA-
current signal.
The existing 0 … 20 mA-signal to the indicat-
ing instrument however is not intrinsically safe.
Safety barrier type 9130 is connected to the
signal line to supply the indicating instrument
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 out of the indicating instrument
and the supply line must not exceed the
stated limit values. The standard wiring is
normally within these values.
2 Technical data
General
Mounting place outside Ex-area on C-rail
Operating temperature -20°C … +40°C
Storage and transport temperature -40°C … +75°C
Cross-section area of conductor 1,5 mm 2 (terminals)
Protection
- terminals
IP 20
- housing IP 40
Weight 100 g
Approvals PTB-no. Ex-91.C.2046 X
Classification [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
Ω
Max. series resistance R
max
73
Ω
Leakage current against earth at U
N
≤
1 µA
Output circuit
Short circuit current I
K
≤
128 mA
Capacitance C
a
at EEx ib IIC
≤
7 µF
Inductance L
a
at EEx ia IIC
≤
1,3 mH
Capacitance C
a
at EEx ib IIB
≤
70 µF
Inductance L
a
at EEx ib IIB
≤
7 mH