Maintenance - Endress+Hauser RN221N Instructions

Terminal layout
L+ L for AC; + for DC
N- N for AC; - for DC
*
Ground (PE)
O+ Measurement signal +
O- Measurement signal -
O+H Measurement signal + with integrated
HART
(250 Ω)
I+ Measurement signal +
I- Measurement signal -
®
HART HART
transmitter

6 Maintenance

®
communication resistance
®
communication to SMART
In general, no specific maintenance is required for this device.
In- / Output
Power supply
Measurement signal output (non-hazar-
dous area)
Measurement signal input (Ex-area)
Communication sockets
21