KROHNE BW 25 EN - Manual (Page 19)

ELECTRICAL CONNECTIONS
4
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BW25
www.krohne.com 09/2010 - 4000432302 MA BW25 R05 en
4.2.2 Electrical signal output ESK
The connecting terminals of the ESK have a pluggable design and can be removed in order to
connect the cables.
The circuitry for connection to other devices such as digital evaluator units or process control
equipment must be designed with special care. In some circumstances, internal connections in
these devices (e.g. GND with PE, ground loops) may lead to impermissible voltage potentials,
which can compromise the function of the device itself or a connected device. In such cases a
protected extra-low voltage (PELV) is recommended.
HART ® communication
When HART ® communication is carried out with the ESK, this will not in any way impair analog
measured-data transmission (4...20 mA). Exception: multidrop operation. In multidrop operation
a maximum of 15 devices with HART
® function can be operated in parallel, whereby their analog
outputs are switched inactive. (I approx. 4 mA per device).
1 ESK2A current transmitter
2 Power supply 12...30VDC
3 Measurement signal 4...20 mA
4 External load, HART
® communication
1 Terminal connection
2 Converter supply isolator with electrical isolation
3 Power supply (see supply isolator information)
4 Measurement signal 4...20mA
5 External load, HART
® communication
MA_BW25_R05_en_432302_PRT.book Page 19 Tuesday, September 28, 2010 8:17 AM