VEGA VEGAPULS 56K - Manual (Page 31)

VEGAPULS 56K 31
22915-EN-041227
4
4 ... 20 mA
2
2
2
2 1)
Measuring system with VEGAPULS 56K Ex, 56K Ex 0 with pressure-tight
encapsulated connection compartment on active PLC
• Two-wire technology, supply via the cable from active PLC to Exd connection compartment
for operation in Ex-Zone 1 (VEGAPULS 56K Ex) or Ex-Zone 0 (VEGAPULS 56K Ex 0)
• Output signal 4 … 20 mA (passive).
• Measured value display integrated in the sensor.
• Optional external indicating instrument with analogue and digital display (can be mounted
up to 25 m away from the sensor in Ex area).
• Adjustment with PC, HART ® handheld or adjustment module MINICOM (can be plugged into
the sensor or into the external indicating instrument VEGADIS 50).
HART ® handheld
VEGA-
CONNECT 2
Electrical connection
1) If the resistance of the processing
systems connected to the
4 … 20 mA signal output is less
than 200
Ω, a resistor must be
connected to the connection cable
during adjustment to get a loop
resistance of 250
Ω up to 350 Ω .
The digital adjustment signal would
otherwise be severely damped or
short-circuited due to insufficient
resistance of the connected
processing system. Digital
communication with the PC would
not be ensured.
2) 4 … 20 mA passive means that
the sensor consumes a level-
dependent current of 4 … 20 mA.
The sensor reacts electrically like
a varying resistor (consumer) to
the PLC.
VEGADIS 50 Ex
passive 2)
EEx d ia
Ex area Non Ex area
PLC
EEx e