SICK L40S-21MA1A Safety Single-Beam Sensor – High-Performance Protection with Axial Detection

The SICK L40S-21MA1A safety single-beam sensor delivers dependable point-to-point safeguarding for machines and hazardous areas where precise detection is required. Using a visible red LED and a 16 m operating range, it ensures stable interruption monitoring even across long distances. Its axial optical path and fast 0.4 ms response time make it suitable for applications demanding rapid stop signals. Housed in a rugged M18 nickel-plated brass body with IP67 protection, the L40S-21MA1A is built to withstand industrial environments while providing consistent and secure performance within SIL3, PL e safety architectures.

The L40S-21MA1A combines durability, precision, and long-term safety compliance to support continuous machine operation. Its 30 mm detection capability allows it to recognize narrow objects or body parts entering a risk zone, contributing to high-level safety control. The sensor aligns quickly thanks to its clear LED indicators, helping reduce commissioning effort. When paired with a compatible evaluation unit, it forms a reliable safety circuit capable of meeting demanding industrial standards. Designed to endure vibration, temperature shifts, and humidity, this model provides a long service life and a very low failure probability, supporting productivity and minimizing unexpected downtime.

Why L40S-21MA1A?

The L40S-21MA1A stands out because it transforms a simple single-beam concept into a highly reliable safety barrier with long-range precision and exceptional durability. Its fast response, stable axial beam, and industrial-grade construction make it a trusted safeguard for machines that cannot afford inconsistent detection or downtime. It’s compact, robust, and engineered to deliver confidence in every cycle.

What Problem Does It Solve?

This sensor eliminates uncertainty in protecting narrow access points, conveyor gaps, or machine openings where even small intrusions must be detected instantly. It solves the challenge of maintaining dependable safety performance across long distances and harsh factory conditions. By providing consistent beam monitoring and rapid stop triggering, it prevents hazardous access and ensures operators and equipment remain protected.

Key Features & Specifications – SICK L40S-21MA1A: 6027339

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The Applications of the SICK L40S-21MA1A Safety Beam Sensor

1. Intrusion Detection on High-Speed Conveyor Lines

In fast-moving conveyor environments, operators occasionally reach near rollers or transfer points, creating potential hazards. The L40S-21MA1A enhances safety by establishing a clean, uninterrupted beam that instantly detects any intrusion across the conveyor’s width. Its 30 mm sensitivity allows it to register small objects such as hands or tools, making it ideal where full light curtain installations may be excessive. The sensor’s long 16 m reach supports use on wide or elevated conveyors, while the rapid response time helps trigger shutdowns before contact occurs. Its IP67 housing ensures stable function despite dust, vibration, and continuous operational cycles.

2. Safeguarding Small Machine Access Ports in CNC and Press Systems

Many CNC machines and compact presses include narrow inspection windows or loading slots that still require dependable operator protection. The L40S-21MA1A fits these tight openings where larger safety devices cannot be mounted. Its focused axial beam stays precisely aligned even when mounted on rigid machine frames that experience vibration. When a hand or object breaks the beam, the fast response prompts the control system to halt movement before a hazardous condition develops. Its visible LED greatly simplifies setup in reflective metalworking areas. With its durable brass housing and shock resistance, the sensor maintains reliability in harsh machining environments.

3. Compact Perimeter Monitoring for Robotic Work Cells

Small robotic stations often lack the space for full guarding solutions, especially when operators interact frequently with the workstation. The L40S-21MA1A enables a minimalistic but effective safety boundary by detecting when someone steps into the robot’s path. Its slim M18 form allows installation on lightweight frames or modular guards. The stable axial beam helps maintain alignment across distances typical of compact robot cells, and the 16 m range accommodates flexible layouts. The sensor’s quick reaction supports safe stoppage before the robot completes hazardous movements. Its IP67 rating ensures continuous operation even when oils, dust, or cleaning fluids are present.

4. Access Control at AGV Loading Zones and Shuttle Transfer Points

Automated material-handling systems often include transition points where humans and mobile equipment interact. The L40S-21MA1A provides a straightforward method to detect unauthorized access or unexpected human presence before automated vehicles move through. Its long-range beam easily spans aisle openings, while the axial design reduces misalignment caused by reflections from storage racks. The sensor’s low power usage makes it suitable for large-scale systems with many detection nodes. When the beam is interrupted, the rapid response gives the control system enough time to halt AGVs or shuttles, preventing collisions and maintaining smooth logistics flow even in busy industrial areas.

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