Technical Overview

The Omron EE-SX870 2M is a highly reliable, slim compact photomicro sensor designed for precision transmissive sensing in confined industrial and automation spaces. Featuring a 5mm slot width and an NPN open-collector output with Light-ON operation, this sensor utilizes a GaAs infrared LED (940 nm) to precisely detect minute opaque objects as small as 2 x 0.8 mm. With a high-speed response frequency of 1 kHz and a versatile operating voltage range of 5 to 24 VDC, it is optimized for seamless integration with TTL circuits, relays, and programmable logic controllers (PLCs). Encased in a durable Polybutylene Terephthalate (PBT) housing and pre-wired with a 2-meter cable for immediate deployment, it ensures consistent operational repeatability (0.025 mm differential travel) across ambient temperatures ranging from -25°C to 55°C.

Key Features

5mm through-beam slot design for accurate, non-contact transmissive object detection [2.17].
NPN open-collector output logic specifically configured for Light-ON operation.
Broad 5 to 24 VDC operating voltage range, ensuring compatibility with standard PLCs and TTL-level inputs.
High-speed 1 kHz response frequency ideal for rapid index and motion control applications.
Pre-wired with a generous 2-meter cable for flexible and convenient routing to control panels.
Ultra-precise detection capability capable of sensing opaque objects as small as 2 mm x 0.8 mm.
Visible operation indicator allows for fast on-site visual monitoring and troubleshooting.
Robust PBT thermoplastic housing rated for industrial temperature ranges between -25°C and 55°C.

Technical Specification Matrix

Parameter	Value
Sensing Distance (Slot Width)	5 mm
Output Type	NPN Open-Collector
Operation Mode	Light-ON
Power Supply Voltage	5 to 24 VDC (ripple 10% max)
Current Consumption	35 mA max.
Control Output Load Current	100 mA max. (at 5 to 24 VDC); 40 mA max. (when driving TTL)
Response Frequency	1 kHz
Standard Detectable Object	Opaque, 2 x 0.8 mm minimum
Differential Travel	0.025 mm max.
Light Source	GaAs Infrared LED (940 nm peak wavelength)
Connection Method	Pre-wired, 2-meter cable
Housing Material	Polybutylene Terephthalate (PBT)
IP Rating	IP60
Operating Temperature	-25°C to 55°C

Industrial Applications

1. High-Speed Indexing Dial Detection

In automated assembly machinery, verifying the exact position of indexing dials or timing disks without physical contact is critical to prevent mechanical wear. The Omron EE-SX870 2M is strategically positioned to sense index marks or teeth on a rotating dial. Its high-speed 1 kHz response frequency captures fast rotations effortlessly, while the 5mm slot allows the dial's edge to pass through unhindered. The sensor outputs a clean NPN signal to a high-speed PLC input module.

Problem Solved

Provides highly repeatable, wear-free positioning validation for fast-moving mechanical indexing systems.

1 kHz Response FrequencyNPN Open-Collector5mm Slot WidthHigh-Speed Indexing

2. Limit Switching for Linear Actuators in Clean Environments

Precision linear slides and miniature actuators require highly repeatable, non-contact end-of-travel limits to prevent over-travel while adhering to strict spatial constraints. Utilizing its slim profile and precise 0.025 mm differential travel, the EE-SX870 acts as a solid-state home position sensor. A thin metallic flag mounted to the linear carriage breaks the infrared beam in the slot, providing a reliable Light-ON (active low) limit signal that instantly stops the motion controller.

Problem Solved

Replaces bulky mechanical limit switches in space-constrained servo and stepper actuator setups, eliminating mechanical bounce and wear.

0.025 mm Differential TravelTransmissive SensingLight-ONNon-Contact Limit Switch

3. Media Detection in Automated Printing and Packaging Systems

Paper jams or missed feeds in high-speed ticket printers or packaging label dispensers can ruin production batches. The sensor is mounted directly along the media feed path where tickets or labels pass straight through the 5mm transmissive slot. It reliably detects ultra-thin opaque objects down to 2 x 0.8 mm, sending an immediate TTL-compatible fault signal if a label fails to feed or a jam obscures the continuous beam.

Problem Solved

Accurately detects paper and thin labeling media in real-time to avoid costly machine jams and misalignments.

2 x 0.8 mm Minimum ObjectGaAs Infrared LEDTTL CompatibleTransmissive Slot

Omron EE-SX870 2M Slim Compact Photomicro Sensor

Omron EE-SX870 2M Slim Compact Photomicro sensor

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. High-Speed Indexing Dial Detection

2. Limit Switching for Linear Actuators in Clean Environments

3. Media Detection in Automated Printing and Packaging Systems