VEGAPULS 51K … 54K 37
21750-EN-031222
Electrical connection
2
2
4
2
-
+
4 ... 20 mA
VEGADIS
371 Ex
Measuring system with VEGAPULS 51K … 54K on VEGADIS 371 Ex indicat-
ing instrument with current and relay output (Ex ia)
• 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 or Ex
zone 0.
• 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
(active)
Relay
(see „7.2 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 250 Ω, a resistor must be connected to the
connection cable during adjustment to get a loop
resistance of 250 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)
Zone 0 or
Zone 1
EEx ia
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