Connecting External Sensors; Loop Powered 2 Wire Transmitter Using An External Power Supply - Endress+Hauser Ria 250 Bedienungsanleitung

Process display

3.4 Connecting external sensors

If there is a possibility of electrical transients on the signal
cables we would recommend that an overvoltage protection
unit is used.
Terminals that are not required are not shown in the connection
diagrams.
3.4.1 Loop powered 2 wire transmitter using the internally
2-wire current connection 2-wire current connection
(loop powered) (loop powered)
3.4.2 Loop powered 2 wire transmitter using an
2-wire current connection
(external powered)
46
available loop power supply
external power supply