KROHNE IFC 100 Converter EN - Manual (Page 40)

4
ELECTRICAL CONNECTIONS
40
IFC 100
www.krohne.com 07/2010 - 4000041004 - MA IFC 100 R04 en
4.11.2 Description of the electrical symbols
mA meter
0...20 mA or 4...20 mA and other
R
L
is the internal resistance of the measuring point including the cable
resistance
DC voltage source (U
ext
), external power supply, any connection polarity
DC voltage source (U
ext
), observe connection polarity according to
connection diagrams
Internal DC voltage source
Controlled internal power source in the device
Electronic or electromagnetic counter
At frequencies above 100 Hz, shielded cables must be used to connect the
counters.
R
i
Internal resistance of the counter
Button, NO contact or similar
Table 4-1: Description of symbols
.book Page 40 Friday, July 9, 2010 12:29 PM