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Part of the Omron Photoelectric Sensors series — see the full model table, lifecycle status and replacement parts.

Omron E3FA-RN11 Retro-Reflective Photoelectric Sensor NPN 3m IP69K — front face showing red LED, sensitivity adjuster, and 4-wire cable gland

Omron E3FA-RN11 — Retro Reflective Sensor, NPN, Pre Wired

SKU: E3FA-RN11

USD 18.00

E3FA M18 retro-reflective sensor, 0.1–4 m with E39-R1 reflector, NPN open-collector, ABS barrel, pre-wired 2 m cable.

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Product Overview

The Omron E3FA-RN11 is a compact M18 cylindrical retro-reflective photoelectric sensor in the E3FA series — ABS plastic barrel, 25 mA NPN open-collector output, pre-wired 2 m cable. manufactured by Omron Corporation. Hengyixin Automation ships this sensor from our Xiamen warehouse with a 30-day DOA return window and a datasheet PDF included in the box.

It detects a target by sensing the beam it returns from a separate reflector, so a single sensor-head / reflector pair watches for the presence or pass of almost any opaque object — boxes, bottles, trays, machine parts — at ranges up to 0.1–4 m with the standard E39-R1 reflector. The E3FA family was designed as a direct upgrade to the older E3F2/E3F3 line: same M18 mount, brighter red LED for fast alignment, IP67/IP69K sealing for food-and-beverage and washdown areas, and visible status LED from long distances and wide angles.

Wire dark-on or light-on by choosing which lead goes to the load — the wiring diagram is in the datasheet.

Key Features

  • DC 12–24 V supply
  • 0.5 ms response time
  • IP67 and IP69K sealing
  • Pre-wired 2 m cable (4-wire)
  • SKU: E3FA-RN11
  • Series: E3FA-RN11
  • Voltage: 24 V

Best-Fit Applications

  • End-of-travel confirmation on a sliding door or guard, paired with an E39-R1 reflector
  • Pallet-overrun check at end-of-line stretch wrap stations
  • Conveyor pass-detection on packaging, sorting, or bottling lines

Buying Checklist

  • Pick the E3FA-RN11 for an NPN PLC or relay input; switch to the E3FA-RP11 if your controller expects a PNP sourcing signal.
  • Allow 1 m of straight cable plus service loop on the 2 m pigtail; if a connector is needed, order the RN21 (M12) instead and pair it with a standard XS3 cordset.
  • Use the BN11 + E39-RP1 polarised pair if your line runs clear bottles, PET, or shrink-wrap — non-polarised retro fails on shiny surfaces.

Technical Specifications

Model E3FA-RN11 (E3FA series, M18 cylindrical)
Sensing Method Retro-reflective (non-polarised)
Sensing Range 0.1–4 m with E39-R1 reflector
Output NPN open collector, dark/light-on selectable
Supply Voltage DC 12–24 V
Connection Pre-wired 2 m PVC cable, 4-wire
Response Time 0.5 ms
Light Source Red LED (visible)
Protection Rating IP67, IP69K
Housing Material ABS plastic
Operating Temperature -25 to +55 °C

FAQ for E3FA-RN11

Does the E3FA-RN11 include a reflector?
No. Order an E39-R1 separately — it is the standard reflector for this head and gives the headline 0.1–4 m range. The retro-reflective head cannot detect without a reflector in the beam path.
E3FA-RN11 or E3FA-DN11 — which do I need?
The RN11 (retro-reflective) works across an open area and watches for anything that breaks the beam between the head and a reflector — typical 1–3 m working distance. The DN11 (diffuse) detects off the target itself with no reflector, useful at very short range (≤100 mm) and on machines where mounting a reflector is awkward.
Can the E3FA-RN11 detect clear bottles or PET?
Not reliably. For PET, clear glass, or shrink-wrapped trays use the polarised E3FA-BN11 2M with the E39-RP1 reflector — its polarising filter rejects the specular reflection from shiny surfaces that fools non-polarised retro sensors like the RN11.
What PLC does the NPN output work with?
Any controller with NPN sinking inputs — most Omron CP1, CJ, and NX-series digital inputs are NPN by default. If your PLC expects PNP sourcing input, order the E3FA-RP11 2M instead; do not wire an NPN sensor into a PNP input.

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