Vega VEGAPULS 56K, Инструкция по эксплуатации

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18 VEGAPULS 56K
2
-
+
4 ... 20 mA
2
4
2
2
> 250
1)
Measuring system with VEGAPULS 56K in four-wire technology
• Four-wire technology, supply and output signal via two separate two-wire lines
• Output signal 4 … 20 mA active
• Optionally external indicating instrument with analogue and digital indication (can be mounted
up to 25 m separated from the sensor)
• Adjustment with PC, HART ® -handheld or adjustment module MINICOM (can be plugged into
the sensor or into the external indicating instrument VEGADIS 50)
• Load max. 500
Ω
Types and versions
active 2)
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 adjust-
ment.
Otherwise the digital adjustment
signal would be extremely
damped or short-circuited via too
small input resistors of a
connected processing system so
that the digital communication
with the PC would no more be
ensured.
2)
4␣ …␣ 20␣ mA active means that the
sensor delivers a level dependent
current of 4␣ …␣ 20␣ mA (source).
The sensor reacts then electrically
against a processing system (e.g.
indication) like a current source.
HART ® -
handheld
VEGA-
CONNECT 2