The E3F-DS15B4-P1: The E3F-DS15B4-: The Omron E3F-DS15B4- is a plastic-housed diffuse reflective photoelectric sensor using an infrared LED. It detects objects up to 100 mm, outputs PNP at 100 mA, and connects via a 4-pin M12 connector. Rated IP66, it operates on 12-24 VDC and can be set to LIGHT-ON or DARK-ON with normally open or normally closed output logic.
Comparison: E3F-DS15B4-P1 vs E3T-SL14M
The E3T-SL14M is an ultracompact convergent-reflective sensor (5–15 mm range, red LED, side‑view) while the E3F-DS15B4- is a barrel‑style diffuse sensor (100 mm, infrared, 18×70 mm). Both are PNP, but the E3T uses a cable connection and the E3F uses an M12 connector. Their sensing principles and form factors differ enough that a panel designed for one would require mechanical and optical rework to accept the other — they are not drop‑in replacements.