The Festo SME-10M-DS-24V-E-2,5-L-OE is a magnetic reed proximity switch designed for detecting piston position in pneumatic cylinders with a round sensor groove (T-slot). It comes with a 10-meter cable, making it suitable for applications where the sensor is mounted far from the controller or where cable routing requires extra length.
This is a magnetic reed switch, so it requires a magnetic field from the cylinder piston to close the contacts. The 10-meter cable (2.5 mm diameter, open end) means you can run it directly to a terminal block or PLC input without an extension — useful for larger machine frames or when the sensor is on a moving carriage. The 24 V DC operating voltage is standard for industrial control circuits, and the switching current is typically in the 500 mA range for reed switches of this class, adequate for driving a PLC input or a small relay directly.
Integration note
Mounts into the round T-slot of Festo cylinders (and compatible third-party cylinders with the same groove profile). The cable exits the sensor body axially; plan cable routing to avoid sharp bends near the cylinder end cap. No bracket required — the sensor locks into the slot with a spring-loaded detent or setscrew (depending on cylinder brand).