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Omron E3FB-DN21 — Photoelectric Sensors

Omron E3FB-DN21 Photoelectric Sensor, NPN, Diffuse, 100 mm,

MPNE3FB-DN21

Omron E3FB Series Photoelectric Sensor, Diffuse, NPN, 4-Pin M12, 10-30V DC, 100 mm Sensing Distance, IP67/IP69K, CE.

$32.51Ref. price · indicative, final on quote
Omron E3FB-DN21 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

E3FB-DN21 — Identification
ParameterValue
SeriesE3FB
E3FB-DN21 — Sensing
ParameterValue
Sensing methodDiffuse
Response time0.5 msec
E3FB-DN21 — Electrical
ParameterValue
Supply voltage10-30V DC
E3FB-DN21 — Environmental
ParameterValue
IP ratingIP67; IP69K
Operating temperature, max.131 °F
E3FB-DN21 — Mechanical
ParameterValue
Body materialBrass
E3FB-DN21 — Approvals
ParameterValue
Standards / approvalsCE

Product details

What’s in the lot – E3FB-DN21

Omron E3FB-DN21: an M18-threaded brass diffuse photoelectric sensor, NPN output, 4-pin M12 connector. Runs on 10-30V DC, switches up to 100 mA, detects opaque objects down to 7 mm at up to 100 mm. Response time 0.5 ms, selectable light-on/dark-on. IP67/IP69K rated – tough enough for washdown zones. Built-in output reverse polarity, short circuit, and supply reverse polarity protection. That means fewer dead sensors on the line – value’s in the sort.

Sibling play: E3FB-DN21 vs E3FB-DN23

E3FB-DN23 is the same sensor with one big difference: sensing distance jumps to 1 m instead of 100 mm. Same M18 brass body, same NPN output, same M12 connector, same IP rating. If your lot needs longer range, grab the DN23 and drop it in the same hole – wiring and mounting identical.

Frequently asked questions

What's the closest functional second-source – E3FB-DN23?

E3FB-DN23 is a direct sibling with a longer sensing distance (1 m vs 100 mm). Same M18 brass housing, NPN output, M12 connector, IP67/IP69K. Physically interchangeable.

Will E3FB-DN21 drop into a panel wired for E3FB-DN23 without rewiring?

Yes – both use the same 4-pin M12 connector, same NPN output wiring (load to +V, output to sinking input). No rewiring needed.

What compliance documentation does this part have?

CE marking is confirmed. RoHS, REACH, and UL are not listed in the available specs.

MPN
E3FB-DN21