CNCR-190 • Two-wire 4-20 mA/HART
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The sensor should be mounted in a location where the radar signal is not interfered with by structure,
such as ladders, braces or fill stream.
Make sure when planning the installation there is a clear, unobstructed view to the material to be
measured. After installation a false signal suppression should be carried out to minimize any reflections
from the mount or nearby structure.
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
• Carry out electrical connection by trained, qualified personnel authorized by the plant operator
• If overvoltage surges are expected, overvoltage arresters should be installed
Warning:
Only connect or disconnect in de-energized state.
Note:
Power the instrument via an energy-limited circuit (power max. 100 W) according to IEC 61010-1, e.g.
• Class 2 power supply unit according to UL1310)
• SELV power supply unit (safety extra-low voltage) with suitable internal or external limitation of the
output current
The device is supplied with a fixed connected cable. If an extension is required, a standard two-wire
cable can be used.
If electromagnetic interference is expected which is above the test values of EN 61326-1 for industrial
areas, shielded cable should be used.
Shielded cable generally necessary in HART multidrop mode.
We recommend to connect the cable screening to ground potential at one end on the supply side when
using shielded cable.
5.2 Wiring plan
Fig. 12: Wire assignment in permanently connected connection cable
