Festo SMTO-4U-PS-K-LED-24 152836 Magneto-Inductive Proximity Sensor

Festo SMTO-4U-PS-K-LED-24 is a round, magneto‑inductive proximity sensor for non‑contact piston position detection on pneumatic cylinders with a T‑slot. The 3‑wire PNP output provides a standard N/O switching signal (N/O contact) for direct connection to a PLC digital input. A 2.5 m PVC cable with open end enables flexible wiring and integration into control cabinets with the IP67 enclosure offering reliable sealing against dust and moisture ingress. A yellow LED visual status indicator located on the sensor body aids quick commissioning and diagnostics.

Applications:

• End‑position detection on pneumatic T‑slot cylinders (Festo DSNU, DNC, ADN series)

• Pick‑and‑place systems and material handling equipment

• Gripper position feedback in assembly and packaging machinery

• Machine automation requiring non‑contact magnetic sensing

Core Specifications:

• Product series: SMTO‑4U

• Measurand: Position

• Operating voltage range: 10…30 V DC

• Switching output: PNP, 3‑wire, N/O contact (normally open)

• Max. output current: 200 mA

• Max. switching capacity DC: 6 W

• Switching times: ≤ 5 ms (on and off)

• Electrical connection: Open‑end cable, 3‑wire, length 2.5 m

• Cable sheath material: PVC, grey

• Sensing principle: Magneto‑inductive (non‑contact)

• Ambient temperature: –25…+70 °C

Advanced Specifications:

• Repetition accuracy: ≤ 0.2 mm

• Reverse polarity protection for all electrical connections

• Short‑circuit protection (pulsed)

• Overload protection available

• Residual current: ≤ 0.01 mA

• Minimum load current: ≥ 0.1 mA

• Voltage drop: ≤ 2 V

• Inductive protective circuit installed

• Mounting position: any (via accessory clamp)

• Max. tightening torque (mounting screw): 0.8 Nm

• Housing material: PET (polyethylene terephthalate), black

• Switching status indication: Yellow LED

• LABS (PWIS) conformity: VDMA24364‑B2‑L

System Integration:

• The sensor is inserted into the T‑slot of a compatible pneumatic cylinder and secured with an external mounting accessory.

• The yellow LED lights when the piston magnet is within the sensing range, confirming correct piston position.

• Fast switching times (≤ 5 ms) support rapid piston cycles in high‑speed automation equipment.

Standards & Compliance:
Refer to manufacturer official documentation for certification and compliance details.

Related Products:

• SMTO‑4U‑PS‑S‑LED‑24 (152742) – M8 connector version for quicker replacement

• SMTO‑4U‑NS‑S‑LED‑24 (152743) – NPN output variant with M8 connector

• SMTO‑4U‑NS‑K‑LED‑24 (152744) – NPN output variant with 2.5 m cable

• SME‑8‑S‑LED‑24 (150857) – standard T‑slot magnetic reed sensor for less demanding switching applications