VEGA VEGASON 54K…56K - Manual (Page 9)

VEGASON 54K … 56K 9
- +
4 … 20 mA
2 2
2
4
3
≥
200
Ω
Measuring system consisting of VEGASON 54K … 56K with any 4 … 20 mA
processing unit
• Four-wire technology, supply and output signal via two separate two-wire cables
• Output signal 4 … 20 mA active
• Optional external indicating instrument with analogue and digital indication (can be mounted
up to 25 m from the sensor)
• Adjustment with PC, HART ® handheld or adjustment module MINICOM (pluggable in the
sensor or in the external VEGADIS 50 indicating instrument)
• Max. resistance on the signal output (load) 500
Ω
VEGADIS 50
1 )
1) If the resistance of the processing systems con-
nected to the 4 … 20 mA signal output is less than
200
Ω
, a resistor must be connected to the con-
nection cable during adjustment, to reach an ad-
justment load of 200
Ω
to 350
Ω
.
The digital adjustment signal would otherwise be
extremely damped or short circuited because of in-
sufficient resistance of the connected processing
system. Communication with the PC would no
longer be ensured.
HART ® handheld
VEGA-
CONNECT 2
2) 4 … 20 mA active means, that the sensor delivers
a level-dependent current of 4 … 20 mA (source).
With respect to the processing system (e.g. dis-
play), the sensor acts electrically as a current
source.
(active) 2)
Types and versions