What this part is and what the ratings mean
The Omron E3T-ST14F 2M is a miniature through-beam photoelectric sensor that operates with a PNP output in Dark-ON (D-ON) mode. Its infrared LED light source—versus the visible red used in the base E3T-ST14—provides immunity to ambient visible light, making it suited for environments with stray light from welding arcs, incandescent bulbs, or sunlight. Sensing distance is rated 1 m through-beam, which holds across the 12 to 24 VDC supply range. The pre-wired robot-grade cable, 2 m long, is designed for continuous flexing in cable carriers or moving arms.
How it compares to the E3T-ST14
The E3T-ST14 shares the same rectangular compact body, PNP Dark-ON output, and 1 m through-beam sensing distance but uses a visible red LED. For applications where ambient visible light is high, or where the emitted beam must be invisible to operators, the infrared version (E3T-ST14F 2M) is the correct choice. Mounting, wiring, and response time (1 msec per the E3T-ST14 datasheet) are identical; only the light source and the robotic cable differentiate them.