SICK L21E-21KA1A Safety Single-Beam Sensor for Machine Guarding

SICK L21E-21KA1A Safety Single-Beam Sensor – Compact, Fast, and Reliable Machine Protection

The SICK L21E-21KA1A safety single-beam sensor is designed to provide dependable point-level protection for machinery where space is limited and fast detection is required. The device projects a precise protective beam that reaches up to 16 meters, allowing it to cover wide or hard-to-reach guarding areas. Its rapid 0.2 ms response time helps reduce risk during machine operation, while its M18 cylindrical body and axial beam alignment make installation straightforward. With a sealed housing rated for harsh industrial conditions and compatibility with standard 24 VDC systems, the L21E-21KA1A offers a practical safety solution for factories seeking consistent and easy-to-maintain protection.

Engineered for reliable safeguarding, the SICK L21E-21KA1A provides a single, focused beam that helps monitor access points, narrow openings, or small areas where traditional light curtains may be unnecessary. Its safety classification—Type 2 with SIL1 and PL c capability—supports compliance with machine safety requirements while enabling flexible integration into existing control architectures. The sturdy PBT housing, glass front, and IP67 sealing help maintain stable performance despite vibration, dust, or temperature changes. This makes it a strong choice for conveyors, automated stations, packaging lines, or equipment where uninterrupted detection reduces downtime and supports smooth, predictable operation.

Why SICK L21E-21KA1A?

The L21E-21KA1A is the ideal choice when you need powerful safety performance in a compact form. It delivers long-range single-beam protection without complex setup, helping machines operate smoothly while keeping operators safe. Its rugged construction and fast reaction time make it a standout option for environments where reliability and simplicity must work hand in hand.

What Problem Does It Solve?

This model solves the challenge of protecting narrow or targeted access points where larger safety systems are unnecessary or difficult to install. It provides a precise detection beam that prevents unsafe entry, reduces machine downtime, and eliminates guesswork in confined guarding scenarios. The result is efficient, cost-effective safety without sacrificing performance or durability.

Key Features & Specifications – SICK L21E-21KA1A (Part No. 6034873)

Download SICK L21E-21KA1A (6034873) Datasheet

Commercial Information – SICK L21E-21KA1A (6034873)

The Applications

1. Guarding Conveyor Entry Points in Packaging Lines

Packaging systems often include narrow conveyor openings where operators stand close to moving parts. The L21E-21KA1A helps create a defined safety point that stops the machine the moment someone crosses into the danger area. Its long sensing distance allows it to monitor extended conveyor paths without needing multiple devices. Because the sensor reacts extremely quickly, stoppages occur before hands or tools reach hazardous mechanisms. Its rugged enclosure resists dust, vibration, and cleaning fluids commonly found around packaging lines. This combination of speed, range, and durability makes it a practical solution for maintaining operator safety while keeping the production flow uninterrupted.

2. Securing Robot Workcells with Compact Access Monitoring

Robotic cells frequently have small entry points where technicians enter for adjustments or inspection. The L21E-21KA1A offers a straightforward way to monitor these access zones without installing large arrays of sensors. When the beam is interrupted, the robot can be brought to a safe stop, preventing accidental contact with moving arms or tools. The compact cylindrical design fits well on crowded frames or posts inside the cell. Its stable performance under vibration ensures the beam alignment remains solid over long periods of operation. By providing precise detection in targeted areas, it supports safer human–robot interaction without restricting workspace or workflow.

3. Protecting Palletizer and Depalletizer Zones

Palletizing equipment handles heavy loads that move quickly, making controlled access essential. The L21E-21KA1A can be positioned across pallet entry paths to detect when an object or person enters the stacking area. Its fast response time helps stop equipment before a shifting pallet or operator movement leads to an incident. The long-range capability makes it suitable for high frames or wider material flows typically found in palletizing stations. Its sturdy housing withstands constant vibration and exposure to packing debris. This targeted safety barrier supports smooth, continuous throughput while reducing risks in warehouse and distribution environments.

4. Monitoring Access to Machinery During Maintenance Operations

Maintenance tasks often bring personnel close to moving components, making dependable access control important. The L21E-21KA1A provides a simple method to ensure machines remain safely disabled whenever someone enters a service zone. The beam can be aligned across doors, removable guards, or temporary openings to detect technician presence instantly. Its wide temperature tolerance allows use in both chilled processing rooms and heated mechanical areas. The straightforward wiring and compact structure also make it suitable for retrofitting older equipment. This approach ensures machinery cannot restart unexpectedly during repairs, improving safety and reducing the likelihood of accidental activation.

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