VEGA 145 Safety barrier - Manual (Page 2)

Technical Information
2 Type 145
Application
The ia safety barrier type 145 is used in conjunc-
tion with a non-Ex-approved signal conditioning
instrument for intrinsically and galvanically isolated
supply at Ex-approved electrodes or Ex-approved
pressure sensors in hazardous areas and for signal
transmission.
Therefore Ex-approved transducers with oscillator
can be connected to standard signal conditioning
instruments (without Ex-approval) without breaking
the explosion regulations.
Attention:
Safety barrier and signal conditioning instrument
must not be installed in the hazardous area.
It should be observed that the supply voltage of the
signal conditioning instrument does not exceed
250 V.
Configuration
The electronics is located in a totally closed,
welded plastic housing. On the top and the bottom
of the front panel two clamp terminals for input and
output circuit are located. The output circuit (to
zone 0) is marked blue on the type plate. An adapter is located on the rear for mounting on
carrier rail TS 32 (C-rail) acc. to EN 50 035 or
TS 35 x 7,5 (rail) acc. to EN 50 022 (snap-in
fastening).
Function
The non intrinsically safe circuit of a signal condi-
tioning instrument is galvanically isolated and
converted into an intrinsically safe output circuit for
transducers (electrode or pressure sensor with
oscillator). The safety barrier does not require any auxiliary
energy. The energy required for operation is taken
from the sensor circuit of the connected signal
conditioning instrument.
Functional principle
11
12
-
+
1
2
+
-
Ex-protective DC / AC Converter AC / DC Ex-protective
circuit control unit control unit circuit
input output