KROHNE SU 600 Ex EN - Manual (Page 14)

Information:
Via the slide switch on the rear of the instrument you can
switch over between active and passive operation of the
measuring data input:
l
In active mode,SU 600 Ex provides the power for the
connected sensors. Power supply and measurement data
are transmitted over the same two-wire cable. This mode is
provided for connection of transmitters without separate
power supply (sensors in two-wire version).
l
In passive mode, the sensors are not powered - only the
measured value is transmitted. This input is for transmitters
with their own separate power supply (sensors in four-wire
version). Furthermore,SU 600 Ex can be connected to an
existing circuit like a standard current meter.
The position of the slide switch also influences the precondi-
tions for Ex implementation. Take note of the type approval
certificate or the conformity certificate ofSU 600 Ex.
14 SU 600 Ex - 4 ... 20 mA signal conditioning
Connecting to power supply
30653
-EN
-050803