The Festo SIEN-M8B-PO-S-L is an inductive proximity sensor with a flush-mountable 8 mm diameter stainless steel housing and a 1.5 mm sensing range — that 1.5 mm is the actual detection distance to a standard steel target, so the sensor must be positioned within that gap from the target face. Flush mounting means it can be embedded in metal without false triggers from the surrounding material, which is the usual requirement for tool changers, gripper jaws, or end-of-stroke detection in tight bores. Rated for 10-30 VDC with a PNP normally-closed (NC) switching output rated to 200 mA — the NC logic means the output is ON when no target is present, so a broken wire or sensor failure reads as a target-present condition, which is the fail-safe choice for safety-monitored position feedback. The 1500 Hz switching frequency handles fast-moving targets on pick-and-place cycles or spindle speeds without missed pulses. IP65/IP67 enclosure rating means the stainless steel body and PA sensing face tolerate washdown spray and temporary submersion — suitable for food-and-bev lines, coolant splash on machining centers, or outdoor conveyor stations. The M8 3-pin connector keeps field replacement quick without opening the panel gland.
This class of inductive proximity sensor is used for non-contact position detection of metal targets in automated machinery — end-of-stroke on pneumatic cylinders, part-presence on transfer lines, or tool-position feedback in machining centers. The flush 8 mm body fits into drilled pockets in steel manifolds or fixture plates without stand-off brackets.