Safety Single-Beam Sensors – L21S-21MA1A

The L21S-21MA1A from the L21 series is a safety-rated single-beam photoelectric sensor designed to protect personnel and machinery in compliance with international safety standards. With an axial optical axis and a scanning range up to 16 meters, it offers flexible installation and long-range coverage for critical safety applications.

The Type 2 sensors conform to IEC 61496-1 and meet SIL 1 (IEC 61508) and PL c (EN ISO 13849) safety levels, making the sensor suitable for Category 2 safety applications. It fast 0.2 ms response time enhances reaction speed, ensuring reliable protection for high-speed operations.

With a rugged nickel-plated brass M18 cylindrical housing and a durable glass lens, the sensor provides IP-rated robustness for use in harsh industrial settings. The low power consumption (≤ 30 mA) and standard 24 V DC supply voltage support easy integration into safety circuits.

Specifications

• Product type: Safety single-beam photoelectric sensors

• Series: L21

• Model: L21S-21MA1A / L21E-21MA1A

• Scanning range: 16 meters

• Number of beams: 1

• Optical axis: Axial

• Response time: 0.2 ms (+ test device response time)

• Design: Cylindrical

• Housing dimensions: M18 x 97.7 mm

• Housing material: Nickel-plated brass

• Lens material: Glass

• Weight: 67 g

• Power consumption: ≤ 30 mA (depending on type)

• Supply voltage: 24 V DC (19.2 V to 28.8 V DC)

• Protection class: III (IEC 61140)

• Safety type: Type 2 (IEC 61496-1)

• SIL: SIL 1 (IEC 61508)

• Performance level: PL c (EN ISO 13849)

• Category: 2 (EN ISO 13849)

• Test rate (external test): 100/s

• Max. demand rate: 60 operations/min

• PFHD: 1.0 x 10⁻⁶ per hour (mean probability of dangerous failure)