VEGA VEGASON 51K…53K - Manual (Page 10)

10 VEGASON 51K … 53K
2
4 … 20 mA
- +
1)
4
2.2 Configuration of meas. systems
A meas. system consists of a sensor with a
4 … 20 mA signal output and a unit evaluat-
ing or processing the level proportional cur-
rent signal.
On the following pages you will see the in-
strument configurations called meas. system
which are shown in the following partly with a
signal processing.
Meas. systems in two-wire technology:
• 4 … 20 mA drawing without processing
unit, (bottom)
• 4 … 20 mA on active DCS, (page 12)
• 4 … 20 mA on active DCS (Ex-area),
(page 13)
• 4 … 20 mA on passive DCS, (page 14)
• 4 … 20 mA on indicating instrument
VEGADIS 371 Ex, (page 15)
Meas. systems in four-wire technology:
• 4 … 20 mA drawing without signal condi-
tioning instrument, (page 16)
VEGADIS 50
VEGA-
CONNECT 2
HART ® -hand-
held
Types and versions
Meas. systems with VEGASON 51K … 53K
• Two-wire technology (loop powered), supply and output signal via a two-wire line
• Output signal 4 … 20 mA (passive)
• Optional external indicating instrument with analogue and digital indication (can be mounted
up to 25 m away from the sensor)
• Adjustment with PC, HART ® -handheld or adjustment module MINICOM (can be plugged into
the sensor or in the external indicating instrument VEGADIS 50)
1) If the resistors of the processing
systems connected to the
4 … 20 mA-signal output are less
than 200
Ω
, a resistor of 250
Ω
to
350
Ω
must be connected to the
connection line during adjustment.
The digital adjustment signal would
be extremely damped or short-
circuited via too small input
resistors of the connected
processing system which means
that the digital communication with
the PC could no longer be
ensured.