{"id":2549,"date":"2026-05-07T01:54:16","date_gmt":"2026-05-07T01:54:16","guid":{"rendered":"https:\/\/industrialsafetysensor.com\/?p=2549"},"modified":"2026-05-07T01:54:16","modified_gmt":"2026-05-07T01:54:16","slug":"what-is-a-safety-light-curtain","status":"publish","type":"post","link":"https:\/\/industrialsafetysensor.com\/fr\/blog\/what-is-a-safety-light-curtain\/","title":{"rendered":"Qu'est-ce qu'un rideau lumineux de s\u00e9curit\u00e9 ? D\u00e9finition, types et normes"},"content":{"rendered":"
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What is a safety light curtain? Put simply, the light curtains is an electro-sensitive protective equipment (ESPE) with an array infrared light beams that detects a person or part of a person entering, 86 milliseconds under IEC 61496-1: 2020, a hazard zone. As a listed presence-sensing device recognized by OSHA, light curtain are the “pre-eminent” of best practices that for seven decades replaced the rigid fences of factory automation devices from the 1950s (Sick 1951 autocollimator patent).<\/p>\n

This briefing covers definition, working principle, Type 2 to Type 4 mapping, machinery safety applications, OSHA & IEC compliance, selection specifications, alternative devices (laser scanner \/ safety mat \/ interlock), installation under the ISO 13855 distance formula, and the 2026+ market outlook \u2014 drawn from IEC, ISO, OSHA primary sources plus three independent market studies.<\/p>\n

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Quick Specs \u2014 Typical Industrial Safety Light Curtain<\/h3>\n\n\n\n\n\n\n\n\n\n
Resolution range<\/td>\n14 mm (finger) \/ 30 mm (hand) \/ 40 mm (arm) \/ 50\u2013500 mm (body, light grids)<\/td>\n<\/tr>\n
Protective height<\/td>\n150 mm to 1.8 m (6 in to 6 ft)<\/td>\n<\/tr>\n
Operating range<\/td>\n0.3 m to 20 m (light curtains); up to 60 m (light grids)<\/td>\n<\/tr>\n
Response time<\/td>\n5 ms to 30 ms (typical), depending on number of beams<\/td>\n<\/tr>\n
Safety integrity<\/td>\nType 2 \u2192 SIL 2 \/ PL c (IEC 61508 \/ ISO 13849); Type 4 \u2192 SIL 3 \/ PL e<\/td>\n<\/tr>\n
Enclosure rating<\/td>\nIP65 to IP67 (industrial standard)<\/td>\n<\/tr>\n
Standards<\/td>\nIEC 61496-1\/-2:2020, ISO 13855:2010, ISO 13849-1<\/a>, ANSI B11.19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

What Is a Safety Light Curtain? Core Definition<\/h2>\n

\"What<\/p>\n

Safety light curtains are designed as non-contact, self-testing presence-sensing devices that create an invisible plane of synchronised infrared beams between an emitter and a receiver. When a finger, hand, or body breaks one or more beams, the receiver immediately switches its output signal switching devices (OSSDs) to the OFF state, which signals a connected safety relay or safety controller to remove power from the hazardous machine motion. Because nothing physically blocks the operator, the device is classed as a “non-separating” guard under OSHA’s machine-guarding eTool<\/a>, and the use of light curtains as a primary safeguard is recognised across U.S. and international machinery directives.<\/p>\n

Common terminology can cause confusion – the names often used by regulatory and industrial engineers interchangeably – but it is important to understand them when reading datasheets or machinery standards and directives:<\/p>\n

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\ud83d\udca1<\/span> Pro Tip \u2014 Five Names for the Same Device<\/strong><\/div>\n