IEC 61496-2:2020

Overview

IEC 61496-2:2020 - "Safety of machinery - Electro‑sensitive protective equipment - Part 2" provides particular requirements for electro‑sensitive protective equipment (ESPE) that use active opto‑electronic protective devices (AOPDs) (for example, light curtains, single‑beam and multi‑beam optical sensors). This 4th edition is a technical revision of the 2013 edition and is intended to be used together with IEC 61496‑1:2020 (general requirements and tests).

Key scope points:

• Specifies design, construction and testing requirements for ESPEs whose sensing function relies on internal opto‑electronic emitting and receiving elements.
• Focuses on features that ensure appropriate safety‑related performance.
• Excludes AOPDs operating at wavelengths outside 400 nm to 1500 nm.
• Does not define detection zone layouts for specific machines, nor EMC emission requirements.

Key Topics and Technical Requirements

IEC 61496‑2 concentrates on technology‑dependent aspects of AOPDs. Major technical topics include:

• Functional, design and environmental requirements for AOPD hardware and sensing subsystems.
• Testing procedures specific to opto‑electronic sensing (alignment, detection capability, extraneous light/reflection tests, periodic test configurations).
• Marking and accompanying documents required for identification and safe use.
• Optional safety‑related functions (referenced in Annex A of Part 1 and Part 2).
• Informative annexes (e.g., Type 2 AOPD periodic test configurations).
• Note: common ESPE requirements and tests moved to Part 1; Part 2 retains tests that depend on sensing technology.

Practical Applications

IEC 61496‑2 is practical for:

• Designing and certifying light curtains, laser/infrared beams, and opto‑electronic safety sensors used to protect personnel from hazardous machine parts.
• Applications beyond personnel protection such as safeguarding equipment or products from mechanical damage (where detection targets differ from humans).
• Defining test methods for manufacturers, test labs and conformity assessors to validate AOPD behavior under misalignment, extraneous light, and environmental conditions.

Who should use this standard

• Machine manufacturers and safety engineers specifying safeguarding systems.
• Sensor and ESPE product designers and R&D teams.
• Integrators and system installers of machine safety solutions.
• Certification bodies, testing laboratories and compliance officers responsible for safety validation.

Related standards

• IEC 61496‑1:2020 - General requirements and tests for ESPEs (mandatory companion).
• IEC 60825‑1 - Safety of laser products (equipment classification).
• IEC 62471 - Photobiological safety of lamps and lamp systems.
• ISO 13855 - Positioning of safeguards relative to approach speeds.
• ISO 20471 - High‑visibility clothing (test methods/requirements).

Keywords: IEC 61496‑2:2020, AOPD, ESPE, safety of machinery, light curtain, opto‑electronic protective device, machine safeguarding, testing procedures, IEC 61496‑1.