VEGA VEGAFLEX 51K - Manual (Page 6)

6 VEGAFLEX 51K
4
+
2
-
+
-
2
2
2 2
VEGADIS 50
VEGAFLEX
4 … 20 mA
VEGADIS 11
PLC
VEGADIS 371 Ex
Relay (4 x)
0/4 … 20 mA
4 … 20 mA
passive
4 … 20 mA
passive
1
2
3
separate power supply with
four-wire technology
Product description
Configuration
A measuring system with a VEGAFLEX can
be realised in different ways (see following
figure).
The external indicating instrument VEGADIS
50 can be separated up to 25 m from the
sensor.
Two-wire technology
1 4 ... 20 mA sensor, supply and measuring
signal via one two-wire cable (loop-pow-
ered), indicating instrument VEGADIS 11
only possible in four-wire technology.
2 Connection to a PLC (active).
3 Connection to an indicating instrument
VEGADIS 371 with up to 4 relay outputs.
Four-wire technology
In addition to a two-wire signal cable, these
measuring systems have a separate supply
cable.
E.g. this is necessary when using a passive
PLC, the inputs of which cannot power the
connected sensors.
This cable is shown in the drawing as a bro-
ken line.
1)
1)
1) only with HART ®