Endress+Hauser Hart RN221N Manual Del Usuario página 32

Terminal assignment
L+ L for AC; + for DC
N- N for AC; - for DC
41
Terminals for relay
42
Reset relay
O+ Measuring signal + with integrated
O- Measuring signal -
I+ Measuring signal +
I- Measuring signal -
®
HART HART
transmitter
!
32
®
communication to SMART
Note!
For correct operation of the device, input as well as output circuit must be
closed. Therefore, the output terminals (O+ and O-) must always be connec-
ted with low-resistance connection (ohmic resistance < 700 Ohm), even if no
evaluation of the output signal is required.
Input/output
Power supply
Relay
Input for status acknowledgment
Measuring signal output side (non-Ex
area)
Measuring signal input side (Ex area)
(sensor connection)
Communication jacks