Omron E3FB-RP21 — M18 Retro-Reflective, 4 m, PNP
SKU: E3FB-RP21USD 27.00
Omron E3FB-RP21 M18 retro-reflective photoelectric sensor, 4 m, PNP, polarized red LED, M12 connector. In stock, China shipping.
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Product Overview
The Omron E3FB-RP21 is an M18 threaded cylindrical retro-reflective photoelectric sensor from the E3FB series, 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.
The sensor detects objects placed between the head and the E39-R1S reflector at 100 mm to 4 m. The light source is a 624 nm polarized red LED with the M.S.R. function that ignores shiny reflective targets. Output is PNP open-collector with selectable Light-ON or Dark-ON, 100 mA max load at 30 VDC. Response time is 0.5 ms. The M12 4-pin connector lands on a standard patch cord.
The M18 brass nickel-plated body is 48 mm long, IP67 and IP69K rated, with a -25 to +55 C operating range. The single-turn sensitivity adjuster sits under the rear cap. The E3FA-RP21 2M sibling is the pre-wired 2 m PVC version of the same M18 body; the E3Z-R86 is the slimmer plastic-body alternative.
Key Features
- E3FB-series M18 threaded cylindrical retro-reflective sensor, 4 m range with E39-R1S reflector, M12 4-pin connector
- 624 nm polarized red LED with MSR function ignores shiny reflective targets, PNP open-collector Light-ON / Dark-ON
- 10 to 30 VDC supply, 100 mA max load at 30 VDC, 0.5 ms response, brass nickel-plated M18 body, 48 mm length
- IP67 / IP69K ingress protection, -25 to +55 C operating, single-turn sensitivity adjuster under the rear cap
- SKU: E3FB-RP21
- Series: Omron E3FB-series cylindrical photoelectric sensor
- Voltage: 10 TO 30 VDC
Best-Fit Applications
- Bottle detection on a beverage conveyor where the polarized red LED rejects false triggers from shiny stainless panels next to the line
- Pallet-height check on an AGV transfer station where the 4 m range and M12 connector mount cleanly at the end of a swinging arm
- Spare replacement on a parts washer where the previous M18 retro-reflective sensor failed and the same M12 pinout must remain
Buying Checklist
- Pick the E3FB-RP21 for a brass-bodied M18 retro-reflective sensor with 4 m range, polarized red LED, and PNP output on an M12 connector.
- Pick the E3FA-RP21 2M instead when the same M18 PNP retro-reflective body is needed with a pre-wired 2 m PVC cable instead of the M12 connector.
- Pick the E3Z-R86 instead when the cabinet needs the slimmer E3Z plastic-body M18 retro-reflective at lower cost.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron E3FB-series cylindrical photoelectric sensor |
| Model / SKU | E3FB-RP21 |
| Sensing Method | Retro-reflective with polarized red LED (M.S.R. function) |
| Sensing Distance | 100 mm to 4 m with E39-R1S reflector (40 x 60 x 7.5 mm ABS + acrylic) |
| Light Source | 624 nm polarized red LED, peak emission wavelength |
| Output Type | PNP open-collector, Light-ON / Dark-ON selectable, 100 mA max load at 30 VDC |
| Response Time | 0.5 ms |
| Supply Voltage | 10 to 30 VDC |
| Connection / Body | M12 4-pin connector; M18 brass nickel-plated housing, 48 mm length |
| Ingress / Temperature | IP67 / IP69K (IEC), -25 to +55 C operating |
Manufacturer documentation
Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.
FAQ for E3FB-RP21
What is the Omron E3FB-RP21 used for?
It is the E3FB-series M18 threaded retro-reflective photoelectric sensor for detecting objects at 100 mm to 4 m with the E39-R1S reflector. The PNP open-collector output suits most modern PLC inputs, and the polarized red LED avoids false triggers from shiny stainless-steel panels.
E3FB-RP21 vs E3FA-RP21 2M - what is the difference?
Both are M18 PNP retro-reflective sensors with 4 m range. The E3FB has a brass nickel-plated body and an M12 4-pin connector; the E3FA-RP21 2M has a plastic body and a 2 m pre-wired PVC cable. Pick the E3FB for harsher washdown environments and the E3FA for quick cord-set installations.
Does the E3FB-RP21 detect shiny objects?
Yes, with the M.S.R. (Mirror Surface Rejection) function the polarized red LED blocks the specular reflection from shiny targets such as PET bottles, polished steel, and reflective tape. The sensor still triggers on the diffuse return from the object itself.
Which reflector pairs with the E3FB-RP21?
The E39-R1S is the standard 40 x 60 mm ABS reflector for the 100 mm to 4 m range. The larger E39-R7 round 84 mm reflector extends the range on long conveyors. The E39-R40 square reflector suits reflective tape mounting.
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