VEGA VEGADIS 371 Ex - Manual (Page 7)

VEGADIS 371 Ex 7
+ -
Active operation (I
a
) 1)
3.2 Sensor connection Ex-area
Note:
When using VEGADIS 371 the connection of an ia-
safety barrier type 145 is not possible. For the use on
sensors in hazardous areas, use VEGADIS 371 Ex.
VEGADIS 371 Ex must be generally mounted outside
hazardous areas.
Passive operation (I
p
) 1)
Electrical connection
Intrinsically safe,
passive sensor, e.g.
pressure transmitter
Signal and supply circuit
(sensor is powered, 4 … 20
mA)
+ -
+
-
Ex-area
Ex-area
Active intrinsically safe signal circuit
4 ... 20 mA
VEGAPULS 81 E Ex
1) Active or passive operation selectable with slide switch.
See “4.1 Indicating and adjustment elements“
Voltage
supply
Voltage
supply
Voltage
supply
4 ... 20 mA
output
4 ... 20 mA