Operating Instructions - VEGAPULS 54K enamel

Measuring system with VEGAPULS 54K via separator (Smart-Transmitter)
on passive PLC
Two-wire technology (loop powered), intrinsically safe ia supply via the signal cable of the
separator for operation of the sensor in Ex zone 1
Output signal sensor 4 … 20 mA passive.
Output signal separator 4 … 20 mA active
Optional external indicating instrument with analogue and digital display (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 into the external indicating instrument VEGADIS 50).
VEGADIS 50
4
Zone 0
or
Zone 1
Ex area Non Ex area
EEx ia
Separator (e.g. VEGATRENN 149 Ex see
"3.2 Approvals“)
2
2
2
VEGA-
CONNECT 2
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.
1)
4 … 20 mA
(active) 2)
24 VEGAPULS 54K enamel
+
-
PLC (passive) 3)
HART ® handheld
Electrical connection
2) 4 … 20 mA active means that the separator
delivers a level-dependent current of 4 … 20 mA
The separator reacts electrically to the PLC like a
current source.
3) 4 … 20 mA passive means that the PLC consumes
a level-dependent current of 4 … 20 mA. The PLC
reacts electrically like a varying resistor (consumer).
24 101-EN-041227