KROHNE MAC 100 EN - Manual (Page 27)

ELECTRICAL CONNECTIONS
4
27
OPTISENS MAC 100
www.krohne.com 04/2011 - MA OPTISENS MAC 100 R01 en
4.9 Connection diagrams of the outputs and the input
4.9.1 Important notes
4.9.2 Description of electrical symbols
DANGER!
Never install or operate the device in potentially explosive areas, it might cause an explosion that
can result in fatal injuries.
INFORMATION!
•
All groups are electrically isolated from each other and from all other input and output
circuits.
• Depending on the version, the inputs/outputs must be connected passively or actively or acc.
to NAMUR EN 60947-5-6 (refer to the sticker in the cover of the terminal compartment for
information about the I/O version and inputs/outputs of your device).
• Passive operating mode: an external power supply is necessary to operate (activation) the
subsequent devices (U
ext
).
• Active operating mode: the signal converter supplies the power for operation (activation) of
the subsequent devices, observe max. operating data.
• Terminals that are not used must not have any conductive connection to other electrically
conductive parts.
Symbol Description
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
Button, NO contact or similar
.book Page 27 Friday, April 1, 2011 4:59 PM