SME-8M-DS-24V-K-7,5-OE Festo Proximity Sensor

Technical Overview

The Festo SME-8M-DS-24V-K-7,5-OE is a high-performance proximity sensor utilizing the magnetic reed measuring principle for T-slot cylinder applications. This sensor features a bipolar contacting switching output with an N/O contact function and is capable of handling a maximum output current of 500 mA. Designed for durability in industrial environments, it is oil-resistant and offers IP65 and IP68 protection. The unit includes a 7.5-meter TPE-U(PUR) cable suitable for use in energy chains and is constructed with a high-alloy stainless steel housing for robust performance.

Key Features

Oil resistant
Magnetic reed measuring principle
Bipolar contacting switching output
N/O contact switching element function
Standard/suitable for energy chains (> 5 million cycles)
Insertable in the slot from above
Yellow LED switching status indication
IP65 and IP68 degree of protection
RoHS-compliant materials
High-alloy stainless steel housing

Technical Specification Matrix

Parameter	Value
Symbol	00991620
Approval	RCM trademark c UL us listed (OL)
CE mark (see declaration of conformity)	To EU EMC Directive In accordance with EU RoHS Directive
UKCA marking (see declaration of conformity)	To UK RoHS instructions
Special characteristics	Oil resistant
Note on materials	RoHS-compliant
Instructions on use	https://www.festo.com/Drive-Sensor-Overview
Measuring principle	Magnetic reed
Ambient temperature	-40 °C ... 70 °C
Switching output	Contacting, bipolar
Switching element function	N/O contact
Max. output current	500 mA
Max. output current using mounting kits	80 mA
Max. switching capacity AC	10 VA
Max. switching capacity DC	10 W
Max. switching capacity DC using mounting kits	2.4 W
Max. switching capacity AC using mounting kits	2.4 VA
Voltage drop	2.25 V
Short circuit current rating	no
Overload protection	Not available
Operational voltage range AC	5 V ... 30 V
Operational voltage range DC	5 V ... 30 V
Reverse polarity protection	no
Electrical connection 1, connection type	Cable
Electrical connection 1, connector system	Open end
Electrical connection 1, number of connections/cores	3
Connection outlet orientation	In-line
Test conditions cable	Bending strength: to Festo standard Test conditions on request Energy chain: > 5 million cycles, bending radius 75 mm
Cable length	7.5 m
Cable characteristic	Standard/suitable for energy chains
Material cable sheath	TPE-U(PUR)
Type of mounting	Screw-clamped Insertable in the slot from above
Product weight	86.8 g
Material housing	High-alloy stainless steel
Switching status indication	Yellow LED
Ambient temperature with moving cable	-5 °C ... 70 °C
Degree of protection	IP65 IP68
LABS (PWIS) conformity	VDMA24364-B2-L

Industrial Applications

1. Pneumatic Clamping Position Detection in CNC Machining Centers

Utilization of the SME-8M sensor to monitor the end positions of pneumatic T-slot cylinders used for workpiece clamping inside automated CNC mills and lathes.

Problem Solved

Standard sensors often fail or short-circuit when exposed to synthetic cutting fluids and oil splashes. This sensor resolves the issue with its IP65/IP68 rating, high-alloy stainless steel housing, and specific oil-resistant TPE-U(PUR) cable sheath, ensuring reliable position feedback in harsh, oily machining zones.

CNC MachiningPneumatic ClampingIP65/IP68Oil ResistantTPE-U(PUR) Cable

2. Robotic End-of-Arm Tooling (EOAT) Gripper Monitoring

Deploying the sensor on robotic arms in high-volume packaging lines to confirm the open/close status of pneumatic gripper jaws.

Problem Solved

Constant movement of the robotic arm leads to premature cable fatigue and breakage in standard sensors. The SME-8M solves this by featuring a long 7.5m cable rated for energy chains (tested for over 5 million cycles at a 75 mm bending radius), preventing downtime from cable wear during continuous flexing.

Robotic GripperEnergy ChainsHigh-Flex Cable5 Million CyclesPackaging Automation

3. Pneumatic Diverter Tracking in Deep Freeze Cold Storage

Integration of the proximity switch into automated sorting conveyors and pneumatic diverters operating in commercial blast freezers or outdoor environments.

Problem Solved

Typical magnetic sensors fail or become sluggish in sub-zero temperatures. This reed sensor maintains reliable bipolar switching at an extreme ambient temperature range down to -40 °C, while the IP68 rating protects against moisture and condensation ingress during automated facility defrost cycles.

Cold Storage LogisticsLow Temperature (-40 °C)Pneumatic DivertersMagnetic ReedCondensation Protection