Endress+Hauser RN 221N, Руководство по эксплуатации, Страница: 20 / 76

3.2 Power supply connection
- Before installing the unit please check that the power supply
corresponds with that shown on the unit legend plate.
- When operating with a 90...253 V AC unit a power isolator must
be situated within easy reach of the unit, this should also be fused
with at least 10 A.
Teminal layout In- and outputs
L/+ L for AC + for DC
Power supply
N/- N for AC - for DC
Ground (PE)
O+ Measurement
Measurement signal
output (Non-Ex -area)
O- Measurement signal -
O+H
Measurement with integrated HART
®
communication resistance (250
Ω
)
I+
I- Measurement
Measurement signal -
Measurement signal
input (Ex- area)
HART

HART

- communication to
SMART transmitter
Communication
sockets
3. Electrical connection
3.1 Terminal layout
HART
®
-
connection sockets
Active barrier
18