RN42 active barrier

Active barrier, 1 channel for 4 to 20 mA, HART® transparent with 24 to 230 V AC/DC as well as active/passive input and output, optionally with SIL and Ex

RN42

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5-year warranty

Engineered for Confidence

Our Fundamental Selection instruments feature an extended 5-year warranty – a clear testament of our trust in their long-term reliability and performance.

Should a warranty case occur, you can count on a fast replacement process and minimal administrative effort – giving you peace of mind when it matters most and helping you keep your operations running smoothly.

Warranty terms apply

The extended warranty is subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

The RN Series interface devices with the RN42 active barrier — RN Series interface devices with the RN42 active barrier for the safe separation of 4 to 20 mA standard signal circuits

RN Series interface modules and RN42 active barrier installed in a control cabinet

RN42 active barrier, wide-range power supply

Specs at a glance

Input

0/4…20 mA / HART
feeding/not feeding
Output

0/4…20 mA / HART
active/passive
Power Supply

24...230 V AC/DC

See all specifications

Field of application

The active barrier is used for transmission and galvanic isolation of 4 to 20 mA/HART signals. The device has an active / passive current input to which a 2- or 4-wire transmitter can be connected directly. The output of the device can be operated actively or passively. The current signal is then available to the PLC / controller or for further instrumentation at pluggable screw or optional push-in terminals.

1-channel active barrier, wide-range power supply
Transmission and galvanic isolation of analog 0/4 to 20 mA signals
Optionally intrinsic safe [Ex-ia] signals from hazardous area
Bidirectional transmission of HART® communication signals
Feeding or not feeding input for 2- or 4-wire instruments
Active or passive signal output
Ambient temperature range: -40 … 60 °C (-40 … 140 °F)

Benefits

Wide range power supply of 19.2 to 253 V _AC/DC
Quick and easy wiring thanks to plug-in terminals
Optional for safety-oriented applications up to SIL 2 (SC3) in accordance with IEC 61508
Optional installation in Ex Zone 2
Compact housing width with 17.5 mm (0.69 in) for efficient use of space
Option for installation rotated by 180° (terminals for power supply at top or bottom)

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Explained in under 3 minutes - RN22 and RN42

Fundamental selection

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

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What is FLEX?

High-end products
Highly functional and convenient

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What is FLEX?

Specialized products
Designed for demanding applications

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What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

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Predecessor

Transmitter Supply RN221N

Success stories

Functional Safety in practice

Investments in functional safety, and thus in measures to avoid accidental and systematic errors, are very moderate if one relies on instruments developed according to IEC 61508.
Read the full story
Remote monitoring via Bluetooth®

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9 documents

Technical Information (TI)

TI RN42

Technical Information (TI)

Spanish version - 06/2024

New version available in English

Barrera activa

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	EN
20/06/2024

Language:	Spanish
Version:	20/06/2024
File size:	687.2 KB
File name:	TI01584KES_0224-00.pdf

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Operating Instruction (BA)

BA RN42

Operating Instruction (BA)

Russian version - 06/2024

New version available in English

Активный барьер, 1-канальный, 4–20 мА, прозрачность для HART®, 24–230 В <sub>перем./пост. тока</sub>, активный/пассивный вход и выхо
д, опционально — с сертификатами SIL и Ex

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	EN
21/06/2024

Language:	Russian
Version:	21/06/2024
File size:	1.2 MB
File name:	BA02090KRU_0224-00.pdf

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Short Instruction (KA)

KA RN42

Short Instruction (KA)

English version - 06/2024

New version available in English

Active barrier, 1-channel for 4 to 20 mA, HART® transparent with 24 to 230 V <sub>AC/DC</sub> and active/passive input and output, o
ptionally available with SIL and Ex

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	EN
21/06/2024

Language:	English
Version:	21/06/2024
File size:	506.7 KB
File name:	KA01509KEN_0424-00.pdf

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Ex Safety Instruction (XA)

XA RN22, RN42

Ex Safety Instruction (XA)

English version - 01/2023

New version available in English

Ex tc IIIC Dc

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	EN
31/01/2023

Language:	English
Version:	31/01/2023
File size:	360.2 KB
File name:	XA03109KEN_0123-00.pdf

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Ex Safety Instruction (XA)

XA RN22, RN42

Ex Safety Instruction (XA)

English version - 10/2023

New version available in English

[Ex ia Ga] IIC
[Ex ia Da] IIIC
Ex ec IIC Gc

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	EN
17/10/2023

Language:	English
Version:	17/10/2023
File size:	367.9 KB
File name:	XA03199KEN_0123-00.pdf

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Functional Safety (FY)

FY RN22, RN42

Functional Safety (FY)

Polish version - 10/2021

New version available in English

Separator zasilający przeznaczony do separacji standardowych obwodów
sygnałowych 4...20 mA, transparentny dla protokołu transmisji H
ART

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Language:	Polish
Version:	29/10/2021
File size:	2.3 MB
File name:	FY01034KPL_0221-00.pdf

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Innovation (IN)

RN Series

Innovation (IN)

French version - 09/2021

New version available in English

Traitement et conditionnement fiable des signaux

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Language:	French
Version:	08/09/2021
File size:	884.3 KB
File name:	IN01216K14FR_01.21-BD.pdf

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Manufacturer Declaration

Product family: Accessories: System components, Contactors/transmitters, Ecograph, Memo-Graph, Over voltage protector, Power supply and barrier, Process displays, Soliswitch

Manufacturer Declaration

English version - 11/2025

New version available in English

Product root: FMA90-, FTE20-, HAW566-, HAW568-, RA33-, RB223-, RH33-, RIA14-, RIA15-, RIA16-, RIA45-, RIA452-, RIA46-, RID14-, RID16
-, RLN22-, RLN42-, RMA42-, RN22-, RN42-, RNF22-, RNO22-, RS33-, RSG35-, RSG45-
Declaration number: HE_02283_01.25
Manufacturer specification: RoHS
Additional information: China RoHS

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	EN
28/11/2025

Language:	English
Version:	28/11/2025
File size:	303 KB
File name:	HE_02283_01.25.pdf

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Explosion Protection

Product family: Power supply and barrier

Explosion Protection

Japanese version - 04/2023

New version available in English

Product root: RN22-, RN42-
Region: Japan
Approval agency: CML
Protection: Ex [i] Zone 0, Ex [i] Zone 20

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Language:	Japanese
Version:	27/04/2023
File size:	233.9 KB
File name:	CML 23JPN2099X JP-EN Iss0.pdf

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RN42 active barrier

Active barrier, 1 channel for 4 to 20 mA, HART® transparent with 24 to 230 V AC/DC as well as active/passive input and output, optionally with SIL and Ex

Specs at a glance

Input

Output

Power Supply

Field of application

Benefits

Videos

Fundamental selection

Predecessor

Success stories

Functional Safety in practice

Remote monitoring via Bluetooth®

Automatic water dosing system of a reverse osmosis system

Prevent grain dust ignition in bulk tanks & silos

Measuring principle

Measuring principle

Function

Loop power supply

Power Supply

Input

Output

Certificates

SIL

Operation

Back

TI RN42

BA RN42

KA RN42

XA RN22, RN42

XA RN22, RN42

FY RN22, RN42

RN Series

Product family: Accessories: System components, Contactors/transmitters, Ecograph, Memo-Graph, Over voltage protector, Power supply and barrier, Process displays, Soliswitch

Product family: Power supply and barrier

Back

Terminal set 3pol. DIN rail screw

Terminal set 3pol. DIN rail push-in

Flap 17.5 W25 DIN rail housing

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