$ 93.38
Reliable SICK L21S-21KA1A safety single-beam sensor with 16 m range, fast response, and Type 2 protection for industrial machine guarding in tough environments.
The SICK L21S-21KA1A safety single-beam sensor provides a simple yet highly reliable way to secure hazardous machine areas using a compact M18 cylindrical design. It delivers long-distance detection up to 16 meters, supported by a bright red LED beam and a rapid 0.2 ms response time, enabling dependable safeguarding without slowing down production. Built for applications where focused, single-point monitoring is required, the L21S-21KA1A offers certified Type 2 protection with SIL1 and PL c performance levels. This makes it a strong fit for OEMs and factories needing an efficient and space-saving safety solution.
Designed for tough industrial settings, the L21S-21KA1A combines durability with fast, consistent operation. Its IP67-rated housing resists dust, moisture, and harsh handling, while the wide –40°C to +55°C operating range supports reliable use in cold rooms, hot processing areas, or outdoor equipment. The sensor’s axial optical path simplifies alignment during installation, reducing setup time and helping maintain stable performance over long periods. With compatibility for test-cycle monitoring through external safety controllers, the device integrates smoothly into many modern safety systems. Its 20-year mission time rating ensures a long service life, contributing to reduced maintenance and increased machine uptime.
The L21S-21KA1A stands out as a compact safety beam that delivers long-range reliability without complicated setup. Its fast reaction time and rugged build make it ideal for machines that demand dependable protection in tight spaces. It offers certified safety performance while keeping installation simple, helping engineers achieve robust safeguarding with minimal effort.
This model solves the challenge of securing hazardous points where traditional light curtains or scanners are unnecessary or too large. It provides focused, high-accuracy detection that prevents unsafe access while allowing equipment to run efficiently. Whether guarding narrow openings, conveyor gaps, or isolated danger zones, it ensures safety without disrupting workflow.
| Feature | Details | Benefit |
|---|---|---|
| Light Source | Visible red LED | Easy alignment and clear visual beam indication during setup. |
| Scanning Range | Up to 16 m | Allows long-distance safeguarding in large or open machine areas. |
| Response Time | 0.2 ms | Enables rapid machine shutdown to enhance operator safety. |
| Safety Classification | Type 2, SIL1, PL c | Meets essential safety standards for industrial protective applications. |
| Number of Beams | Single-beam, axial alignment | Ideal for narrow access points or focused hazard protection. |
| Operating Voltage | 24 V DC (19.2–28.8 V DC allowed) | Compatible with common industrial power systems. |
| Power Consumption | ≤ 20 mA | Low energy usage reduces overall system load. |
| Housing Design | M18 cylindrical body, PBT plastic | Compact and durable for constrained mounting spaces. |
| Front Screen Material | Glass | Ensures optical clarity and long-term durability. |
| Enclosure Rating | IP67 | Withstands moisture, dust, and washdown environments. |
| Operating Temperature | –40°C to +55°C | Reliable performance in cold storage, outdoor setups, or high-heat zones. |
| Vibration & Shock Resistance | 5 g vibration / 10 g shock | Maintains stability on moving machinery or vibration-heavy systems. |
| Optical Angle | ±5° aperture and receiving angle | Supports consistent detection even with slight misalignment. |
| Dimensions | M18 × 97.7 mm | Slim form factor for tight installation locations. |
| Connection Type | M12, 4-pin, straight | Standard industrial connector simplifies wiring and replacement. |
| Mission Time | 20 years | Long operational lifespan reduces maintenance planning. |
| Certifications | EU, UK, cTUVus, China RoHS, Ex approval | Supports global regulatory compliance and multi-region deployment. |
Download SICK L21S-21KA1A (6034872) Datasheet
| Commercial Data | Details |
|---|---|
| Weight | 95 g |
| Country of Origin | Italy |
In fast-moving production lines, operators often work close to conveyor intersections where boxes or components transfer between belts. These tight areas leave little room for large safety devices, making a compact beam sensor ideal. The L21S-21KA1A creates a precise detection point that immediately halts motion when someone reaches in, reducing the risk of injury during jam clearing. Its long sensing distance allows flexible mounting, while the bright red beam makes alignment simple. The rapid response time ensures that even quick, unintentional movements are detected before machinery continues running, allowing companies to maintain productivity without compromising operator safety.
Industrial sliding doors, especially those used in warehouses or process enclosures, must detect people approaching the path of a closing door. The L21S-21KA1A fits well into narrow frames and provides a reliable beam that stops motion the moment it is interrupted. Its rugged enclosure resists dust and humidity, which is common in loading areas or partially exposed structures. The axial beam design keeps alignment stable even after repeated door cycles. By using a single-beam point instead of wide-area scanning devices, facilities gain a simpler, cost-effective safeguard that prevents pinch injuries while supporting smooth material and personnel flow.
Robotic workstations often require a defined entry point where employees can load components or perform quick inspections. The L21S-21KA1A offers a focused detection line that reacts instantly when crossed, ensuring the robot halts before unsafe interaction occurs. Because these environments often involve vibration from machinery, the sensor’s mechanical robustness helps maintain consistent alignment. Its compact size enables discreet installation without interfering with robot movement or fixture placement. When paired with a safety controller, the sensor forms an effective access-check system that protects operators while allowing equipment to operate at full speed when the zone is clear.
Automated stackers, shuttles, and guided vehicles move quickly along defined paths in warehouses and distribution centers. To prevent staff from entering these active routes unnoticed, single-beam sensors are mounted at key perimeter points. The L21S-21KA1A’s long-range capability allows protection over extended aisle lengths, reducing the number of devices required. Its wide operating temperature range supports use in cold storage as well as warm facilities. When the beam is broken, the system can immediately stop or slow equipment. This creates a simple but highly effective barrier that enhances worker safety without complicating the layout of automated storage systems.
| Category | Model / Name | Part Number | Description / Benefit |
|---|---|---|---|
| Accessory – Sensor/Actuator Cable | YF2A14-050VB3XLEAX | 2096235 | 5 m unshielded PVC cable with M12 4-pin straight connector; suitable for general chemical or clean environments. |
| Accessory – Female Connector (Straight) | DOS-1204-G | 6007302 | Straight M12 4-pin connector with screw terminals; ideal for field wiring and panel integration. |
| Accessory – Female Connector (Angled) | DOS-1204-W | 6007303 | Angled M12 4-pin connector for installations with limited vertical or horizontal clearance. |
| Accessory – Sensor/Actuator Cable (Angled) | YG2A14-050VB3XLEAX | 2095897 | 5 m unshielded PVC cable with angled M12 4-pin connector; improves cable routing in tight spaces. |
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