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Technical DatasheetTD 00015E/24/EN/01.13

• Two-channel supply for two 2-wire sensors or transmitters

•Galvanic isolation between all circuits

• LED status indicators•Wide range power supply, 20 to

250 V AC/DC, 50/60 Hz• Top hat (35 mm / 1.38”) DIN rail

mounted housing to EN 50 022-35

Complete product information:www.e-direct.us/rns221

Specs at a glance:

•HART® signal: Bidirectional•Diagnostics:

Via HART® status bit or NE43• Relay output:

Optional for HART® diagnostics

Power supply

RNS221

$ 201.00

RNS221 2

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Application / Function

Application The RNS221 power supply supplies two 2-wire sensors or galvanically isolated transmitters. This is only valid for non-hazardous areas. Using the HART® communication sockets allows bi-directional communication to SMART transmitters (for setup, etc.).

Function The power supply has two galvanically isolated outputs for supplying voltage to sensors and transmitters. A built-in communication resistance (R = 250 Ω) enables bi-directional HART® communication with SMART sensors and transmitters.The system includes two channel power supply, 24 V DC, 30 mA, with LED status display for electrical supply of sensors and transmitters. All circuits are galvanically isolated from each other. The unit is constructed of 35 mm top hat DIN rail mounting.

RNS221 3

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DimensionsTechnical data

Technicaldata Dimensions(ininches)

OutputOutput signal Two channels for transmitter power supply,

open circuit voltage 24 V ±10 %, with integrated HART® communication resistance R=250Ωforeachoutput

Output current circuit Maximum 30 mA. Short circuit current, both channels are continuously short circuit protected

Galvanic isolation Between all circuits

Power supplyPower supply Wide range power supply, 20 to 250 V AC/

DC, 50/60 HzPower consumption P≤5WCurrent requirement (Input current limitation) Imax /In < 15Power failure To EN 61 000-4-11

Operating conditionsAmbient temperature -20 to +60 °C (-4 to +140 °F)Storage temperature -30 to +70 °C (-22 to +158 °F)Climatic class To EN 60 654-1 Class B2Ingress protection NEMA 1EMC To IEC 61326, transmission Class A,

immunity to IEC 61326 industrial environment

Over voltage protection

To EN 61 010-1, Category II, installation protectionfuse≤10A

0.89 4.41

1 2

CH 2

ENDRESS+HAUSERRNS 221

CH 1

3.78

4.33

Housing for top hat rail mounting according to IEC 60715

Installation according to instruction manual

Mechanical constructionWeight < 1 lb (approximately 0.140 kg)Housing PC/ABS, UL 94V0Terminals Power and signal connections, keyed plug-on

screw terminal, 16 AWG solid wire; 18 AWG for stranded wire with ferrule. Communication connection sockets, 2 mm (0.79”) on front panel of unit

Display and operating levelDisplay elements 2 yellow illuminated LEDs with connected

outputs; 1 green illuminated LED with main power connection

Installation hints The installation area must be vibration-free; keep within the permitted ambient temperature range; protect the unit from extreme heat sources

ApprovalsCSA approval CSA General Purpose

RNS221 4

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20 to 250 VAC/DC50/60 Hz

Connection HART® 2

Connection HART® 1

HART®X03 X01 X02

L/L+ N/L-

Terminal layout In and outputsL/L+ L for AC, L+ for DC Input for power

supplyN/L- N for AC, L- for DCX01 Power supply to transmitter 1 and 2 (+) Output for

transmitterpower supply

X02 Power supply to transmitter 1 and 2 (+)X03 Power supply to transmitter 1 and 2

with intergrated HART® communication resistance(R=250Ω)(+)

HART® HART® communication to SMART transmitter

Communicationsockets(CH 1, CH 2)

Pricetable

RNS221 Order no. Price/pcs. in USDApproval Power Supply 1 to 5 6 to 10 11 to 35Non-hazardous area 20-250 V DC/AC RNS221-A1 228.00 212.00 201.00Prices valid until 09.30.2013 in U.S. dollars per unit (not including shipping and applicable sales tax).See Endress+Hauser, Inc. Terms and Conditions of Sale for shipping, tax, and payment terms.

Complete product information:www.e-direct.us/rns221

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Contact

E-directEndress+Hauser, Inc.2350 Endress PlaceGreenwood, IN 46143

Direct order

Internet www.e-direct.usby phone 888- EH-DIRECT

(343-4732)per Fax 317-535-8498E-Mail e-direct@us.endress.com