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Transmitter supply for DIN rail

Power supply for two 2 wire sensors or transmitters

  • Power supply RNS221 ©Endress+Hauser

The power supply has two galvanically isolated outputs for supplying voltage to sensors and transmitters. A built-in communication resistance enables bidirectional HART® communication with SMART sensors and transmitters.


  • Galvanic isolation between all circuits

  • Sockets and built in 250 Ohm resistor for HART® communication

  • Wide-range power supply 20 to 250 V AC/DC, 50/60 Hz

  • Top hat DIN rail mounted housing to IEC 60715

Field of application

The unit supplies two 2 wire sensors or transmitters galvanically isolated. This is only valid for non-Ex areas.
Using the HART® communication sockets bi-directional communication to SMART transmitters, (for setting up etc.).

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Predecessor / Successor

Predecessor: NX9120, NX9121

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Endress+Hauser Inc.
2350 Endress Place Greenwood , IN 46143 United States
Tel.: 888-363-7377
Fax: 317-535-8498
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