Nivus NFP, Инструкция по эксплуатации

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Instruction Manual
NIVUS Full Pipe
page 30 NFP - rev. 04 / 23.05.2018
Fig. 20-7 AC model power supply
Fig. 20-8 DC model power supply
20.7 Overvoltage Protection Precautions
Reduction of the possible cable length with overvoltage protection
The use of overvoltage protection elements for sensors in Non-Ex areas will reduce the
maximum possible cable length.
The line resistance is 0.3 Ohm/wire. This resistance must be taken into account consider-
ing the allowed total resistance. Observe the “Technical Instructions for Correlation Sen-
sors and external Electronic Box”.
Overvoltage protection elements are subject to natural wear and tear and therefore shall be
inspected regularly and replaced if necessary in the course of maintenance measures as
well as after electric malfunctions.
For effective protection of the NFP transmitter it is necessary to protect power supply and
mA-output.
NIVUS recommends
•
for the mains supply the types
>EnerPro 220 Tr< for 230 V AC
and/or
>EnerPro 24 V< for 24 V DC