SICK L21 Series Light Beam Receiver, 1 Beam(s), 16 m Max Range

SICK L21 Series Safety Single Beam Sensor, 16m Maximum Scanning Distance, 200μs Maximum Response Time - L21E-21MA1A / 6034875

This safety single-beam sensor provides a Compact receiver solution for presence detection and safeguarding in automated systems. Designed for industrial environments, it detects a single light beam to monitor access or object passage and integrates with control circuits via a screw-terminal interface. It is suitable where a straightforward, single-beam sensing arrangement is required.

Features and Benefits:

• 200μs maximum response time for Rapid detection and reaction
  16m maximum sensing range enabling long-distance monitoring
  660nm Peak Wavelength for visible red-beam operation
  Safety Type 2 classification supporting Basic protective functions
  Screw-terminal connection for robust field wiring

Applications

• Suitable for conveyor end-of-line presence detection over long runs
  Ideal for machine guarding where single-beam monitoring is acceptable
  Used for access detection on automated Gates and doors
  Can be used for object passage counting in packaging lines

What form factor should I expect for mounting in confined spaces?

The receiver uses an M18 cylindrical housing with a 97.7mm overall length, allowing installation within Compact fixtures and standard M18 mounting arrangements.

How quickly will the device respond to an interrupted beam?

The receiver is specified with a maximum response time of 200μs, which supports Rapid system-level interruption detection for safety-related stop functions.

Which electrical termination method is provided for wiring?

Connections are MADE via screw terminals, permitting secure attachment of control and supply conductors during installation and maintenance.

What optical characteristic defines the beam emission the receiver accepts?

The device is designed to detect a beam with a Peak Wavelength of 660 nm, corresponding to a visible red light source used in compatible transmitters.

Are there any limitations on minimum detection distance?

The receiver is rated with a minimum scanning distance of 0 m, allowing sensing directly at the receiver face where alignment and application permit.