VEGA VEGAPULS 54K enamel - Manual (Page 25)

VEGAPULS 54K enamel 25
24 101-EN-041227
- +
4 ... 20 mA
VEGADIS
371 Ex
2
2
2
4
EEx ia
1)
Measuring system with VEGAPULS 54K on VEGADIS 371 Ex indicating
instrument with current and relay output
• Two-wire technology (loop powered), intrinsically safe ia supply via the signal cable of the
VEGADIS 371 Ex indicating instrument for operation of the sensor in Ex zone 1
• 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).
(passive)
VEGADIS 50
0/4 … 20 mA
Relay
(see „3.2 Approvals“)
Ex area Non Ex area
HART ® handheld
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 process-
ing system. Digital communication with the PC
would not be ensured.
Zone 0 or
Zone 1
Electrical connection