SME-8M-DS-24V-K-2,5-OE Festo Proximity Sensor | T-Slot Reed Switch

SME-8M-DS-24V-K-2,5-OE Festo Proximity Sensor – Reliable T-Slot Position Detection

The SME-8M-DS-24V-K-2,5-OE from Festo is a magnetic reed proximity sensor. It fits all Festo cylinders with T-slots. This sensor delivers stable position feedback in pneumatic systems. Its oil-resistant design suits harsh industrial environments. The 2.5 m cable works well in energy chains and robot applications.

This sensor uses a magnetic reed measuring principle. It offers a contacting, bipolar switching output. The N/O contact ensures simple integration. A yellow LED shows switching status clearly. The sensor mounts securely into the slot from above. Vibration, shock, or cable pull will not loosen it.

Core Technical Data

• Brand: Festo
• Model: SME-8M-DS-24V-K-2,5-OE
• Series: SME Series
• Measuring principle: Magnetic reed
• Switching output: Contacting, bipolar
• Switching element function: N/O contact
• Operational voltage range AC: 5 V … 30 V
• Operational voltage range DC: 5 V … 30 V
• Max. output current: 500 mA
• Max. output current with mounting kits: 80 mA
• Max. switching capacity AC: 10 VA
• Max. switching capacity DC: 10 W
• Max. switching capacity DC with mounting kits: 2.4 W
• Max. switching capacity AC with mounting kits: 2.4 VA
• Voltage drop: 1.5 V
• Short circuit current rating: No
• Overload protection: Not provided
• Reverse polarity protection: No
• Ambient temperature: -40 °C … 70 °C
• Ambient temperature with moving cable: -5 °C … 70 °C
• Degree of protection: IP65, IP68
• Switching status indication: Yellow LED
• Electrical connection: Cable, open end, 3 cores
• Cable length: 2.5 m
• Cable characteristic: Standard, suitable for energy chains
• Cable sheath material: TPE-U(PUR)
• Material housing: PA, high-alloy stainless steel
• Type of mounting: Screw-clamped, insertable in slot from above
• Product weight: 29.8 g
• Accuracy: ± 0.1 mA
• Body style: T-slot
• Design: T-slot
• Type: Magnetic cylinder
• Supply voltage: 24 V DC
• Output: NO
• Transistor type: NO
• UNSPSC Code: 41110000
• Unit of Measure: EA
• Alternate Mfr Part Number: 543862

Key Features and Benefits

• Oil-resistant for tough environments
• RoHS compliant materials
• IP65 and IP68 rated for dust and water
• Energy chain ready cable, > 5 million cycles
• Bending radius: 75 mm
• VDMA24364-B2-L LABS (PWIS) conformity
• Sturdy central mounting prevents loosening
• Vibration and shock resistant
• Clear yellow LED for easy status check
• Simple screw-clamped installation

Installation Guide

• Insert the sensor into the T-slot from above.
• Screw-clamp it securely into the slot.
• Ensure the cable runs freely without tension.
• For energy chains, respect a 75 mm bend radius.
• Do not exceed 80 mA with mounting kits.
• Connect the 3-core open cable to your circuit.
• Check the yellow LED for switching status.

Setup and Maintenance

• No special tools needed for mounting.
• Clean the sensor with a dry cloth only.
• Check cable condition regularly in moving applications.
• Verify LED function during routine checks.
• Replace if the housing shows damage.
• No overload or reverse polarity protection built in.

Compatibility Notes

• Fits all Festo cylinders with T-slots.
• DHDS: SME-8M can only be used on 50.
• DHPS: SME-8M can only be used on 2 to 35.
• HGDD-63-A: SMT-8M-A cannot be used.
• HGPT-B: SMT-8G can only be used from size 40 upwards.
• SDBT-BSW-PU/NU can only be used on limited drive series.
• DFM-B: SMTO-8E, SMTSO-8E, SMEO-8E, SMPO-8E cannot be used.
• Not for C-slot cylinders without a mounting kit.

Certifications and Approvals

• RCM approved
• c UL us Listed (Oil)
• CE mark to EU EMC Directive
• EU RoHS Directive compliant
• UKCA marking to UK EMC and RoHS instructions
• LABS (PWIS) conformity VDMA24364-B2-L

Expert Review

The SME-8M-DS-24V-K-2,5-OE stands out for its rugged T-slot fit. The magnetic reed principle gives reliable bipolar switching. The oil-resistant PUR cable lasts long in energy chains. However, it lacks short circuit and reverse polarity protection. Users must add external safeguards. The 1.5 V voltage drop is moderate. The 500 mA max current handles most PLC inputs. The IP68 rating makes it suitable for washdown areas. This sensor is a solid choice for standard pneumatic position sensing.

Manager’s Insight

This Festo sensor offers a strong balance of cost and durability. The SME series is well known for stable T-slot mounting. The 2.5 m cable reduces wiring needs. The yellow LED saves troubleshooting time. For high-vibration machines, this sensor stays put. The lack of overload protection means you should size fuses carefully. The 80 mA limit with mounting kits is a key constraint. Order this part for reliable, long-term cylinder feedback.

Best Applications and Equipment

• Festo pneumatic cylinders with T-slots
• Energy chain systems and robotic arms
• Oil-heavy industrial environments
• Washdown areas needing IP68
• Assembly lines with vibration
• Packaging machines
• Material handling equipment
• Automotive production lines

FAQ

Q: What is the switching function of this sensor?

A: It has a normally open (N/O) contact.

Q: Can I use this sensor in water?

A: Yes, it has IP68 protection for water immersion.

Q: Does it work with all Festo cylinders?

A: It works with all Festo T-slot cylinders. Check compatibility notes for special models.

Q: What is the maximum output current?

A: 500 mA without mounting kits. 80 mA with mounting kits.

Q: Is reverse polarity protection included?

A: No, you must wire it correctly.

Q: How long is the cable?

A: The cable is 2.5 meters long.

Q: What is the ambient temperature range?

A: -40 °C to 70 °C. For moving cable, -5 °C to 70 °C.

Q: Does it come with mounting hardware?

A: No, mounting kits are sold separately.

Q: What is the voltage drop?

A: The voltage drop is 1.5 V.

Q: Can I use this in an energy chain?

A: Yes, it is rated for > 5 million cycles at 75 mm bend radius.

Buying Guide

• Check your cylinder slot type: T-slot only.
• Confirm your voltage: 5 V to 30 V AC/DC.
• Verify current needs: 500 mA max, 80 mA with kits.
• Consider oil resistance: Yes, this model is oil-resistant.
• Check IP rating: IP65 and IP68 for harsh areas.
• Review cable length: 2.5 m may need extension.
• For high vibration, this screw-clamped design works well.
• If you need overload protection, add an external fuse.
• For C-slot cylinders, choose a different model.
• Order mounting kits separately if needed.

Shipping and Warranty

• Warranty: 12 months
• Dispatch time: 12 to 24 hours
• Courier options: FedEx, UPS, DHL
• Packaging: 1 x SME-8M-DS-24V-K-2,5-OE sensor
• Contact: sales@powergearx.com
• WhatsApp: +86 18030005825

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