Endress+Hauser RMA 421 Mise En Service page 50

Process transmitter
3.4 onnecting external sensors
If there is a possibility of electrical transients on the signal
cables we will recommend that an overvoltage protection unit is
used. In order to improve operation and minimise fault
conditions it is recommended that unused terminals are linked
as shown in the following diagrams.
Not required terminal blocks are not shown in the connection
diagrams.
3.4.1.
2-wire transmitter without HART
2-wire transmitter with HART
&
eries loop powered 2-wire transmitter when using the
loop power supply in the unit
-
+
82 83 81 14
13
-
+
250 Ω
83
82 81 14 13
-
+
15
11
11 16
12
I
Y
internal supply
®
11 15
11 16
12
I
Y
internal supply
®