E+H RN22 Active Barrier

Fits 0/4–20 mA signal isolation and loop power in control cabinets where you need a slim DIN-rail active barrier or signal doubler that stays HART-transparent.

Key advantages

HART-transparent active barrier — 1-/2-channel isolator / signal doubler for 0/4–20 mA.
Slim 12.5 mm DIN rail — Compact cabinet density at 24 V DC supply.
Loop power >16.5 V — Typ. 17.5 V ±1 V at 20 mA to the field transmitter.
Optional SIL 2 / Ex zone 2 ec — Marks by order code; ambient −40…+60 °C.

Typical applications

Control-cabinet 0/4–20 mA isolation and loop power.
Signal doubling when two hosts need the same analogue process value.
HART loops that must stay transparent through the barrier.

Selection guide

Function — 1-/2-channel active barrier / signal doubler, HART-transparent.
Input — 0/4–20 mA, powered or non-powered.
Output — 0/4–20 mA, active or passive.
Supply — 24 V DC.
Loop power — >16.5 V (typ. 17.5 V ±1 V at 20 mA).
Housing — DIN rail, width 12.5 mm.
Ambient — −40…+60 °C.
SIL / Ex (options) — Optional SIL 2 (SC 3) per IEC 61508; optional Ex zone 2 ec.
Approvals (datasheet) — CE; ATEX; IECEx; CSA; UL; DNV; EAC; SIL optional.

Common mistakes

Ordering 1-channel when the loop needs signal doubling (2-channel) — channel count is a configuration choice.
Assuming every unit is SIL or Ex — SIL 2 (SC 3) and Ex zone 2 ec are optional; lock them on the order code if required.
Ignoring loop-power headroom: available >16.5 V (typ. 17.5 V ±1 V at 20 mA) must cover transmitter + cable drop.
Treating this as a field transmitter — it is a cabinet DIN-rail barrier / isolator for 0/4–20 mA signals.
Claiming HART transparency without confirming the host and field device both use HART on the same 4–20 mA pair.

When to RFQ / what to tell us

1- or 2-channel; barrier vs signal-doubler use.
Input mode (powered vs non-powered 0/4–20 mA) and output mode (active vs passive).
Available 24 V DC supply and required loop voltage at the transmitter.
Whether optional SIL 2 (SC 3) and/or Ex zone 2 ec are required.
Ambient in the cabinet (−40…+60 °C envelope), quantity, ship-to country.
Required marks (CE, ATEX, IECEx, CSA, UL, DNV, EAC as applicable).

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Specs

Spec	Value
SKU	65181
Brand	Endress+Hauser
Model	RN22
Product type	barrier
Function	1-/2-channel active barrier / signal doubler, HART-transparent
Input	0/4–20 mA, powered or non-powered
Output	0/4–20 mA, active or passive
Supply voltage	24 V DC
Loop power	>16.5 V (typ. 17.5 V ±1 V at 20 mA)
Housing	DIN rail, width 12.5 mm
Ambient temperature	−40…+60 °C
SIL	Optional SIL 2 (SC 3) per IEC 61508
Ex	Optional Ex zone 2 ec
Approvals	CE; ATEX; IECEx; CSA; UL; DNV; EAC; SIL optional

Documents

Endress+Hauser RN22 datasheet (PDF)

FAQ

Q: Isolator, barrier, or doubler? A: Product data describes a 1-/2-channel active barrier / signal doubler that is HART-transparent. State whether you need isolation only or a second identical 0/4–20 mA output.

Q: Is SIL or Ex included by default? A: No. SIL 2 (SC 3) per IEC 61508 and Ex zone 2 ec are optional. Say which marks you need in the RFQ.

Q: What supply and loop voltage should I plan for? A: Supply is 24 V DC. Loop power to the field is >16.5 V (typ. 17.5 V ±1 V at 20 mA) — check cable and transmitter burden.

Q: What should I send for a quote? A: Channel count, in/out modes, SIL/Ex need, ambient, quantity. Compatible with systems using Endress+Hauser RN22 if you need a drop-in check — we do not claim authorized-dealer status.