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Power, condition, isolate and protect your analog signal loop​

RN Series
Reliable signal processing
and conditioningServices

2RN Series

Power, condition,isolate and protect
your analog signal loop
The RN Series interface, signal
processing and conditioning modules
power the foundation of your analog
measurement instruments loop andintrinsic safety infrastructure

Perfectly alignedwith Endress+Hauser instruments

Fit-for-purpose
Focus on essential features

Easy operation
User-centric featurese.g. easily accessible front HART® taps

Simple selection
Low variant complexity

Saves spacein the control cabinet(2 channels on 12.5 mm)

RNB22
Power supply
24 V / 2,5 A

Power, condition, isolate and protect your analog signal loop

RN22
Active barrier/signal doubler
24 V DC(1-/2-ch.)

RNO22
Output isolating
amplifier24 V DC
(1-/2-ch.)T-connector
24 V DC +failure signal
No wiring, fast commissioning:
T-connector to power the RN
Series modules

RNF22
Feed-in & error
message module

RLN22
NAMUR
Isolating amplifier
24 V DC
(1-/2-ch.)

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4RN Series

Intrinsically safe, SIL-certified interface components

About the RN Series
The RN Series interface modules power thefoundation of measurement instrument
loops and safety instrumented systems built
on the widely used analog process control
infrastructure.
The intrinsically safe signal processing andconditioning devices (up to SIL 2 (SC 3) inaccordance with IEC 61508) ensure reliable
power supply and safe operations in hazardous areas, establishing a trusted signal link
between field instruments and the processcontrol level.

Smart power
Smart functions such as NAMUR signal
conversion, line fault monitoring, galvanic
signal isolation, signal doubling, output signal
amplification with bidirectional HART® transparency give operators control and flexibility
in systems of any scale, protecting assets
and safeguarding data signal integrity in theprocess.

Power, condition, isolate and protect your analog signal loop

Application examples• Safely power and separate your 2- and 4-wire devices in hazardous areas (galvanic isolation)• Double your measurement instrument signal to feed a display or a data manager(open a second channel for the process optimization domain without affecting the traditional automationsystem)• Safely actuate your active components (control valves, pumps) in hazardous areas• Monitor system faults (wire breaks, short circuits)• Establish redundant power supply with intelligent error diagnostics• Enhance basic switching instruments with NAMUR capabilities• Translate NAMUR signals into switching signals

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6RN Series

RNB22

RNF22

RN22

system power supply unit
Features and benefits

Applications• Safe and reliable, single-phase output in thepower range up to 100 W• Smart system function monitoring for fault
prevention for high system availability• Powerful reserve capacity for lower powerranges• Transient surge protection, short-circuit proof,
no-load proof• Tool-free installation, suited for vertical or
horizontal mounting• High-efficiency 24 VDC / 2.5 A power supply
with low power dissipation• Parallel mode with RNF22 for redundancy• Suited for decentralized applications orremote cabinets• Compact housing efficient use of spacein control cabinets• Low heat dissipation, no lateral clearance
required• Ambient temperature range:-25 to 70 °C (-13 to 158 °F)

power feed-in and error message moduleFeatures and benefits

Applications• Safe and reliable 24 V DC interface power
supply, single or redundant• Intelligent diagnostics built-in: power supply
failure or fuse error• Quick and easy wiring with plug-in terminals• Compact housing: 17.5 mm (0.69 in) for
efficient use of space in control cabinets• Power and error message module for safeand reliable operations in hazardous areas• Single or redundant 24 V DC supply voltage,
up to 3.75 A supply current• Relay output for error message• Group error evaluation of connected NAMURisolating amplifiers (RLN22)• Activation/deactivation of group error
detection via DIP switch• Ambient temperature range:-20 to 60 °C (-4 to 140 °F)

active barrier, power supply, analog signal doubler
Features and benefits

Applications• Intrinsically safe interface device suited for use
in safety instrumented systems up to SIL 2(SC 3) in accordance with IEC 61508• Quick and easy wiring with screw or pushin terminals or power supply via power rail
T-connector• Easy access to frontside HART® connection taps
• Compact housing: up to two channels on
12.5 mm (0.49 in) for efficient use of spacein control cabinets• 1- or 2-channel active barrier,power supply or signal doubler• 0/4 to 20 mA analog signal transmission
and galvanic isolation• Intrinsic safety for operation in hazardous
areas (Zone 2)• Bidirectional HART® communication(transparent)• 2- and 4-wire capability for instruments
in hazardous areas (Zones 0/20)• Ambient temperature range:-40 to 60 °C (-40 to 140 °F)

Power, condition, isolate and protect your analog signal loop

RLN22

RNO22

NAMUR isolating amplifier
Features and benefits

Applications• Safe and reliable switching operations: trust
your critical applications• Compact housing: up to 2-channels on 12.5mm (0.49 in) for efficient use of space incontrol cabinets• Installation in hazardous areas; Ex approval
for Ex zone 2• Up to SIL 2 in accordance with IEC 61508• Quick and easy wiring and commissioning:plug-in terminals, power supply and grouperror message via DIN rail bus connector• NAMUR isolating amplifier for the transmission of binary switching signals• Input for proximity sensors, open contacts orcontacts with resistive coupling elements• Galvanic isolation (3-way)• Line fault monitoring of input circuits ormechanical switching contacts• Group error message via DIN rail bus connector• Output-side relay contacts, direction of action(operating or quiescent current behavior) via
DIP switch selection• Ambient temperature range:-40 to 60 °C (-40 to 140 °F)

output amplifier
Features and benefits

Applications• Safe and reliable control of active components
in hazardous areas• Quick and easy wiring and commissioning:plug-in terminals, power supply via DIN railbus connector• Compact housing: up to 2 channels on 12.5mm (0.49 in) for efficient use of space incontrol cabinets• Accurate and reliable signal transmission• Line break and short-circuit monitoring• 1- or 2-channel output isolating amplifier• Reliable control of active components suchas control valves, current-to-pressuretransducers• Transmission and galvanic isolation of0/4 to 20 mA signals• Intrinsically safe [Ex-ia], installation in Ex Zone2• Suited for use in safety instrumented systems
up to SIL 2 (SC 3) in accordance with IEC 61508• Bidirectional transmission of digital HART
communication signals• Ambient temperature range:-40 to 70 °C (-40 to 158 °F)

For more information, please visit:

Quicklinks to products:

endress.com/rn-series

endress.com/rn22
endress.com/rln22
endress.com/rno22

endress.com/rnf22
endress.com/rnb22

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8RN Series

Selection Guide
Application

Examples2-wire (4 to 20 mA / HART®) instruments

Levelflex FMP51, Cerabar PMP71, ModuLine TM131,
Liquiline M CM42, Proline 200

4-wire (4 to 20 mA / HART®) instruments

Proline 300

Data managers

Memograph M RSG45
Ecograph T RSG35

Point level switches

Liquiphant FTL51, Liquipoint FTW31,
Soliswitch FTE20

Active components controlled via 4 to 20 mA / HART®

Control valves, actuators

Isolating amplifier / barrier

RN22 / RLN22 / RNO22

System power supply and isolating amplifier / barrier

RNB22 & RN22 / RLN22 / RNO22

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Power, condition, isolate and protect your analog signal loop

RNB22

RNF22

RN22

RN22

RN22

RLN22

RLN22

RNF22

RN22

RN22

RN22RLN22

RLN22

RNB22

1-ch 2-chInterface

Function

RN221

4 to 20 mA / HART®
Isolating amplifier/barrier (active)
Sensor supply

RN22 14 to 20 mA / HART®
Isolating barrier (passive)(alternative signal terminal assign)

RN22-++3+

4 to 20 mA / HART®
Isolating amplifier/barrier (active/passive)
Signal doubler

RLN22 2

NAMUR isolating amplifier
Signal line fault monitoring(break or short circuit)

RNO22

4 to 20 mA / HART®
Output isolation amplifier (active)

RNB22230V/110V AC to 24 V DC
System power supply

RNF22

Feed-in & error message module for
redundant power supply (incl. T-connector)

1

available also with wide-range power supply: 24-230V AC/DC (RN42)

2

available also with wide-range power supply: 24-230V AC/DC (RLN42)

RN Series
Add power and safety to analog signal loops

910RN Series

Delivering process values without compromising safety

LTE

FieldEdge
SGC500FieldEdge
SGC200

SWG70

Bluetooth®

SFG250

SFG500

WirelessHART®

RSG45HART®

PROFINET®

®

Power, condition, isolate and protect your analog signal loop

Applications / Cloud

Edge devices, DCS

DCS

Gateways /signal interfaces

RN Series
0/4 to 20 mA / HART®
NAMUR isolating amplifier

RNB22

RNF22

RN22

RN22

RN22

RLN22

RLN22

PROFIBUS®

EtherNet/IP™

0/4 to 20 mA

Field devices11

IN01216K/09/EN/02.23

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