Endress+Hauser RLN22 Isolating Amplifier

Fits NAMUR (EN60947-5-6) proximity, open-contact, or resistive-coupling loops that need a 1- or 2-channel isolating amplifier with relay output, three-way galvanic isolation, and DIN-rail mounting at 12.5 mm width.

Key advantages

NAMUR isolating amplifier — 1-/2-channel for NAMUR proximity sensors and contacts.
Relay outputs — changeover (1-ch) or N/O per channel (2-ch) per TI.
Three-way galvanic isolation — separates sensor, output, and supply domains.
Line-fault monitoring — published LF detection with 19.2–30 V DC supply.

Typical applications

Cabinet isolation of NAMUR proximity switches from PLC relay inputs.
Hazardous-area sensor loops needing galvanic isolation and LF monitoring.
1- vs 2-channel density choices on DIN rail.

Selection guide

Function — 1-/2-channel NAMUR isolating amplifier with relay output.
Input — NAMUR (EN60947-5-6) proximity sensors / open contacts / resistive coupling; thresholds <1.2 mA / >2.1 mA class.
Output — Relay output (1-ch changeover; 2-ch N/O per channel — verify TI).
Supply — 19.2–30 V DC.
Isolation — Three-way galvanic isolation.
Line-fault monitoring — Yes (per TI).
Housing / mount — DIN rail, width 12.5 mm.
Ambient — –40…+60 °C (see TI environmental table).
SIL — SIL 2 suitability (see FY01035).
Approvals — CE; SIL.

Common mistakes

Ordering channel count wrong — 1-ch changeover vs 2-ch N/O per channel; verify the TI wiring table before the order code.
Assuming every unit is SIL-ready for your safety loop without checking FY01035 and the ordered configuration.
Feeding AC supply — this SKU is specified for 19.2–30 V DC only.
Ignoring line-fault monitoring wiring/config when the plant expects open-wire / short detection.
Confusing RLN22 (NAMUR → relay) with active 0/4–20 mA barriers such as RN42 / RN22.
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When to RFQ / what to tell us

Channel count (1 or 2) and sensor type (NAMUR proximity / open contact / resistive).
Available DC supply (must fit 19.2–30 V DC).
Whether line-fault monitoring must be enabled and how it is wired to the DCS/PLC.
SIL 2 / safety-loop needs and any additional marks required.
Quantity and ship-to country.

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Specs

Spec	Value
SKU	141049
Brand	Endress+Hauser
Model	RLN22
Product type	barrier (NAMUR isolating amplifier)
Function	1-/2-channel NAMUR isolating amplifier with relay output
Input	NAMUR (EN60947-5-6) proximity / open contacts / resistive; thresholds <1.2 mA / >2.1 mA class
Output	Relay (1-ch changeover; 2-ch N/O per channel — verify TI)
Supply voltage	19.2–30 V DC
Isolation	Three-way galvanic isolation
Line-fault monitoring	Yes (per TI)
Housing / mount	DIN rail, width 12.5 mm
Ambient temperature	–40…+60 °C (see TI environmental table)
SIL	SIL 2 suitability (see FY01035)
Approvals	CE; SIL
Notes	Specs from Endress+Hauser TI01560K. Related SIL document FY01035 for RLN22/RLN42 family.

Documents

Endress+Hauser RLN22 technical information (PDF)

FAQ

Q: What inputs does the RLN22 accept? A: NAMUR (EN60947-5-6) proximity sensors, open contacts, or resistive coupling, with thresholds in the <1.2 mA / >2.1 mA class per the TI.

Q: Is SIL 2 included? A: OEM documentation lists SIL 2 suitability; confirm against FY01035 and the ordered configuration before claiming it on a safety loop.

Q: What supply does it need? A: 19.2–30 V DC. State available panel DC in the RFQ.

Q: What should I send for a quote? A: Channel count, sensor type, supply, line-fault monitoring need, SIL/marks, quantity, ship-to. Compatible with systems using Endress+Hauser RLN22 if you need a drop-in check — we do not claim authorized-dealer status.