Endress+Hauser RN221N Instructions page 20

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Terminal layout
Fig. 2:
Terminal layout
Connecting a sensor
There is no need for any external components to supply any transmit-
ters connected. If there is a possibility of electrical transients on long
signal cable runs we would recommend that an overvoltage protec-
tion unit is used.
Output - Connection to further instrumentation
Please take note of the respective volt drop when including the com-
munication resistance in the current circuit!
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