The SIEN-M5B-NS-S-L is an M5 inductive proximity sensor in the SIEN series, flush-mountable in stainless steel. Its 800 µm sensing distance means it detects ferrous targets at sub-millimeter proximity — typical for end-of-stroke or presence on small pneumatic actuators or grippers. The 3 kHz switching frequency supports fast cycling on pick-and-place or cam-driven lines without missing a target. IP67 seals the stainless steel housing against coolant splash and washdown, so it holds up on machining centers or packaging lines where fine metal chips and moisture are present. Output is NPN normally open, sinking up to 200 mA — a standard PLC digital input load. The M5 plug connector mates with a standard M5 cordset, so panel wiring stays clean and replacement takes seconds without opening the junction box.
Drop-in vs the cable variant
The closest sibling is the SIEN-M5B-NS-K-L, which shares every functional spec — M5 flush mount, NPN NO, 800 µm range, 3 kHz, IP67, stainless steel — but terminates in a 2.5 m PUR cable instead of an M5 plug. If your panel was wired around the cable version, the plug variant (SIEN-M5B-NS-S-L) will not drop in without changing the cordset or adding a pigtail. The electrical characteristics are identical, so a field swap is possible with a short M5-to-flying-lead adapter.
Integration notes
At 8 × 8 × 38 mm, the sensor fits into tight machine frames or tooling nests where a larger M8 or M12 barrel would not clear. Flush mounting lets it sit level with the mounting surface, reducing snag risk on moving tooling. The 10–30 V DC supply range covers standard 24 V control loops; current draw is only 10 mA, negligible on the power budget. Repeat accuracy of 40 µm gives consistent trip points for precision indexing.