{"id":1335,"date":"2026-04-10T08:56:04","date_gmt":"2026-04-10T08:56:04","guid":{"rendered":"https:\/\/industrialsafetysensor.com\/?p=1335"},"modified":"2026-09-10T16:11:28","modified_gmt":"2026-09-10T16:11:28","slug":"type-4-safety-light-curtain-guide","status":"publish","type":"post","link":"https:\/\/industrialsafetysensor.com\/pt\/blog\/type-4-safety-light-curtain-guide\/","title":{"rendered":"Cortina de luz de seguran\u00e7a tipo 4: guia de sele\u00e7\u00e3o e padr\u00f5es"},"content":{"rendered":"\n<style>\r\n.cch-blog-hero {\r\n  box-sizing: border-box;\r\n  background: #f7f9fa;\r\n  border-bottom: 1px solid #e1e8ec;\r\n  padding: 78px 28px 72px;\r\n}\r\n\r\n.cch-blog-hero * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-hero-inner {\r\n  max-width: 980px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-hero-meta {\r\n  display: flex;\r\n  flex-wrap: wrap;\r\n  gap: 10px 18px;\r\n  align-items: center;\r\n  margin-bottom: 24px;\r\n  color: #6b7e89;\r\n  font-size: 12px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-hero-category {\r\n  color: #128fce;\r\n  font-weight: 800;\r\n  letter-spacing: .08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-hero-dot {\r\n  width: 3px;\r\n  height: 3px;\r\n  border-radius: 50%;\r\n  background: #9cafb9;\r\n}\r\n\r\n.cch-blog-hero h1 {\r\n  max-width: 920px;\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(42px, 5.2vw, 68px);\r\n  line-height: 1.08;\r\n  font-weight: 800;\r\n  letter-spacing: -.035em;\r\n}\r\n\r\n.cch-blog-hero-dek {\r\n  max-width: 840px;\r\n  margin: 26px 0 0;\r\n  color: #4f6572;\r\n  font-size: 19px;\r\n  line-height: 1.75;\r\n}\r\n\r\n.cch-blog-hero-summary {\r\n  max-width: 840px;\r\n  margin-top: 34px;\r\n  padding: 22px 24px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #ffffff;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-hero-summary strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-hero-links {\r\n  display: flex;\r\n  flex-wrap: wrap;\r\n  gap: 12px 20px;\r\n  margin-top: 28px;\r\n}\r\n\r\n.cch-blog-hero-link {\r\n  color: #167ba8 !important;\r\n  font-size: 13px;\r\n  line-height: 1.5;\r\n  font-weight: 750;\r\n  text-decoration: none !important;\r\n  border-bottom: 1px solid rgba(22,123,168,.3);\r\n}\r\n\r\n.cch-blog-hero-link:hover {\r\n  border-bottom-color: #167ba8;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-hero {\r\n    padding: 58px 20px 56px;\r\n  }\r\n\r\n  .cch-blog-hero h1 {\r\n    font-size: 40px;\r\n  }\r\n\r\n  .cch-blog-hero-dek {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-hero-summary {\r\n    padding: 18px 19px;\r\n  }\r\n\r\n  .cch-blog-hero-links {\r\n    flex-direction: column;\r\n    align-items: flex-start;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-hero\">\r\n\r\n  <div class=\"cch-blog-hero-inner\">\r\n\r\n    <div class=\"cch-blog-hero-meta\">\r\n\r\n      <span class=\"cch-blog-hero-category\">\r\n        Engineering Guide\r\n      <\/span>\r\n\r\n      <span class=\"cch-blog-hero-dot\"><\/span>\r\n\r\n      <span>\r\n        Safety Light Curtains\r\n      <\/span>\r\n\r\n      <span class=\"cch-blog-hero-dot\"><\/span>\r\n\r\n      <span>\r\n        Updated September 2026\r\n      <\/span>\r\n\r\n    <\/div>\r\n\r\n    <h1>\r\n      Type 4 Safety Light Curtain Guide:\r\n      Standards, Selection &amp; Integration\r\n    <\/h1>\r\n\r\n    <p class=\"cch-blog-hero-dek\">\r\n      Type 4 is a functional-safety classification for active\r\n      opto-electronic protective devices, but selecting a Type 4 safety\r\n      light curtain requires more than choosing the highest device type.\r\n      Detection capability, machine risk, safety distance and the complete\r\n      safety function all need to work together.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-hero-summary\">\r\n      <strong>In this guide:<\/strong>\r\n      what Type 4 means under the IEC 61496 framework, how it relates to\r\n      machine safety performance, how 14, 25 and 45 mm detection resolution\r\n      affects selection, and how ISO 13855:2024 influences safeguard\r\n      positioning.\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-hero-links\">\r\n\r\n      <a\r\n        class=\"cch-blog-hero-link\"\r\n        href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/\">\r\n        View the ENT Type 4 product page \u2192\r\n      <\/a>\r\n\r\n      <a\r\n        class=\"cch-blog-hero-link\"\r\n        href=\"\/blog\/type-2-vs-type-4-risk-based-selection\/\">\r\n        Type 2 vs Type 4 comparison \u2192\r\n      <\/a>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-section {\r\n  box-sizing: border-box;\r\n  background: #ffffff;\r\n  padding: 78px 28px 82px;\r\n}\r\n\r\n.cch-blog-section * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-section-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-section-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-section h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-section-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #f3f8fb;\r\n}\r\n\r\n.cch-blog-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-inline-link {\r\n  color: #167ba8 !important;\r\n  font-weight: 750;\r\n  text-decoration: none !important;\r\n  border-bottom: 1px solid rgba(22,123,168,.28);\r\n}\r\n\r\n.cch-blog-inline-link:hover {\r\n  border-bottom-color: #167ba8;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-section {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-section h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-section-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-section\">\r\n\r\n  <div class=\"cch-blog-section-inner\">\r\n\r\n    <div class=\"cch-blog-section-number\">\r\n      02 \u00b7 Understanding Type 4\r\n    <\/div>\r\n\r\n    <h2>\r\n      What Does \u201cType 4\u201d Actually Mean?\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-section-lead\">\r\n      Type 4 describes the functional-safety characteristics of an active\r\n      opto-electronic protective device. It does not describe the size of the\r\n      light curtain, its sensing distance, its resolution, or the overall safety\r\n      performance of the machine.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-prose\">\r\n\r\n      <p>\r\n        Safety light curtains are commonly classified under the\r\n        <strong>IEC 61496<\/strong> framework for electro-sensitive protective\r\n        equipment. Within that framework, Type 4 devices are designed to meet\r\n        more demanding requirements for fault detection, diagnostic behavior\r\n        and resistance to dangerous failure than lower device Types.\r\n      <\/p>\r\n\r\n      <p>\r\n        In practical terms, this means a Type 4 safety light curtain is designed\r\n        so that faults relevant to the protective function are detected with a\r\n        high level of reliability.  In practical terms, Type 4 devices incorporate diagnostic measures intended\r\n  to detect safety-relevant faults so that such faults do not silently defeat\r\n  the protective function.\r\n      <\/p>\r\n\r\n      <h3>\r\n        Type 4 Is a Device Classification \u2014 Not a Complete Machine Rating\r\n      <\/h3>\r\n\r\n      <p>\r\n        One of the most common misunderstandings is to treat\r\n        <strong>Type 4, Category 4, PL e and SIL 3<\/strong> as interchangeable\r\n        labels. They are related concepts used in functional-safety engineering,\r\n        but they describe different parts of the safety problem.\r\n      <\/p>\r\n\r\n      <p>\r\n        The light curtain has its own device classification. The complete\r\n        safety function also includes the safety-related control system,\r\n        machine stopping behavior, output devices, wiring, diagnostic coverage\r\n        and the way the safeguard is positioned around the hazard.\r\n      <\/p>\r\n\r\n      <h3>\r\n        Type 4 Also Does Not Determine Resolution\r\n      <\/h3>\r\n\r\n      <p>\r\n        A Type 4 safety light curtain may use different detection resolutions.\r\n        For example, the current CCH ENT platform includes 14, 25 and 45 mm\r\n        options. These resolutions address different detection requirements,\r\n        but all belong to the same Type 4 product family.\r\n      <\/p>\r\n\r\n      <p>\r\n        Resolution, safety distance and device Type therefore need to be\r\n        selected together rather than treated as the same specification.\r\n        We cover the resolution question later in this guide.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-note\">\r\n\r\n      <div class=\"cch-blog-note-label\">\r\n        Engineering Note\r\n      <\/div>\r\n\r\n      <strong>\r\n        \u201cType 4\u201d should answer one question: what safety-device classification\r\n        does the protective device meet?\r\n      <\/strong>\r\n\r\n      <p>\r\n        It should not be used by itself to decide the required resolution,\r\n        installation distance or final machine performance level. Those decisions\r\n        come from the machine risk assessment and the complete safety-function\r\n        design.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-prose\">\r\n\r\n      <p>\r\n        If you are deciding whether a machine requires Type 2 or Type 4,\r\n        see our\r\n        <a class=\"cch-blog-inline-link\" href=\"\/blog\/type-2-vs-type-4-risk-based-selection\/\">\r\n          Type 2 vs Type 4 risk-based selection guide\r\n        <\/a>\r\n        rather than choosing only from the product label.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-standards {\r\n  box-sizing: border-box;\r\n  background: #f8fafb;\r\n  padding: 78px 28px 82px;\r\n  border-top: 1px solid #e5ebef;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-standards * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-standards-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-standards-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-standards h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-standards-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-standards-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-standards-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-standards-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-standards-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-standards-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-standards-table-wrap {\r\n  overflow-x: auto;\r\n  margin-top: 34px;\r\n  border-top: 2px solid #183746;\r\n  border-bottom: 1px solid #d9e3e8;\r\n}\r\n\r\n.cch-blog-standards-table {\r\n  width: 100%;\r\n  min-width: 680px;\r\n  border-collapse: collapse;\r\n}\r\n\r\n.cch-blog-standards-table th,\r\n.cch-blog-standards-table td {\r\n  padding: 17px 14px;\r\n  border-bottom: 1px solid #dfe7eb;\r\n  text-align: left;\r\n  vertical-align: top;\r\n}\r\n\r\n.cch-blog-standards-table tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n.cch-blog-standards-table th {\r\n  color: #173041;\r\n  background: transparent;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .06em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-standards-table td {\r\n  color: #536975;\r\n  font-size: 14px;\r\n  line-height: 1.68;\r\n}\r\n\r\n.cch-blog-standards-table td:first-child {\r\n  width: 180px;\r\n  color: #173041;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-standards-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #ffffff;\r\n}\r\n\r\n.cch-blog-standards-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-standards-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-standards-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-standards {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-standards h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-standards-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-standards-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-standards-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-standards-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-standards\">\r\n\r\n  <div class=\"cch-blog-standards-inner\">\r\n\r\n    <div class=\"cch-blog-standards-number\">\r\n      03 \u00b7 Standards Framework\r\n    <\/div>\r\n\r\n    <h2>\r\n      The Standards Behind a Type 4 Safety Light Curtain\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-standards-lead\">\r\n      No single standard answers every machine-safety question. IEC 61496\r\n      defines the protective-device requirements, while other standards address\r\n      the safety-related control system and the positioning of the safeguard.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-standards-prose\">\r\n\r\n      <p>\r\n        For a Type 4 safety light curtain, the most important distinction is\r\n        between the standard that defines the <strong>protective device<\/strong>\r\n        and the standards used to design the <strong>complete safety function<\/strong>.\r\n        Mixing these roles is one reason terms such as Type 4, PL e and safety\r\n        distance are sometimes incorrectly treated as if they describe the same thing.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-standards-table-wrap\">\r\n\r\n      <table class=\"cch-blog-standards-table\">\r\n\r\n        <thead>\r\n          <tr>\r\n            <th>Standard<\/th>\r\n            <th>Primary Role<\/th>\r\n            <th>Why It Matters Here<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n\r\n        <tbody>\r\n\r\n          <tr>\r\n            <td>IEC 61496-1:2020<\/td>\r\n            <td>\r\n              General requirements and tests for electro-sensitive\r\n              protective equipment (ESPE).\r\n            <\/td>\r\n            <td>\r\n              Provides the general framework for safety-related\r\n              performance, design and testing of the protective equipment.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td>IEC 61496-2:2020<\/td>\r\n            <td>\r\n              Particular requirements for active opto-electronic\r\n              protective devices (AOPDs).\r\n            <\/td>\r\n            <td>\r\n              Applies specifically to the sensing technology used by\r\n              conventional safety light curtains.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td>ISO 13849-1:2023<\/td>\r\n            <td>\r\n              Design and integration of safety-related parts of control systems.\r\n            <\/td>\r\n            <td>\r\n              Provides the methodology used when evaluating the performance\r\n              of the complete safety-related control function, including PL.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td>ISO 13855:2024<\/td>\r\n            <td>\r\n              Positioning and dimensioning of safeguards relative to\r\n              human approach.\r\n            <\/td>\r\n            <td>\r\n              Used when determining how far a protective device should be\r\n              positioned from the hazardous area for the applicable approach.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n        <\/tbody>\r\n\r\n      <\/table>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-standards-prose\">\r\n\r\n      <h3>\r\n        IEC 61496 Does Not Determine the Final Safety Distance\r\n      <\/h3>\r\n\r\n      <p>\r\n        IEC 61496 establishes requirements for the electro-sensitive protective\r\n        equipment itself. It does not by itself determine where the light curtain\r\n        must be installed on a particular machine.\r\n      <\/p>\r\n\r\n      <p>\r\n        Safeguard positioning requires additional information about how a person\r\n        can approach the hazard, how quickly the machine can stop, and how the\r\n        complete safety function responds. This is where standards such as\r\n        ISO 13855 become relevant.\r\n      <\/p>\r\n\r\n      <h3>\r\n        PL e Is Also Not Another Name for Type 4\r\n      <\/h3>\r\n\r\n      <p>\r\n        ISO 13849-1 addresses the safety-related parts of the control system.\r\n        A Type 4 light curtain can be used within safety functions requiring\r\n        high performance, but the final achieved Performance Level depends on\r\n        the complete architecture and not on the light curtain label alone.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-standards-note\">\r\n\r\n      <div class=\"cch-blog-standards-note-label\">\r\n        Engineering Note\r\n      <\/div>\r\n\r\n      <strong>\r\n        Think of the standards as layers rather than interchangeable ratings.\r\n      <\/strong>\r\n\r\n      <p>\r\n        IEC 61496 addresses the protective device, ISO 13849-1 addresses\r\n        safety-related control-system design, and ISO 13855 addresses safeguard\r\n        positioning. A compliant machine safety function may need all of these\r\n        considerations working together.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-safety-function {\r\n  box-sizing: border-box;\r\n  background: #ffffff;\r\n  padding: 78px 28px 82px;\r\n}\r\n\r\n.cch-blog-safety-function * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-safety-function-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-safety-function-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-safety-function h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-safety-function-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-safety-function-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-safety-function-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-safety-function-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-safety-function-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-safety-function-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-safety-flow {\r\n  margin-top: 36px;\r\n  padding: 6px 0;\r\n  border-top: 1px solid #dce5ea;\r\n  border-bottom: 1px solid #dce5ea;\r\n}\r\n\r\n.cch-blog-safety-flow-row {\r\n  display: grid;\r\n  grid-template-columns: 54px 190px 1fr;\r\n  gap: 18px;\r\n  align-items: start;\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-safety-flow-row:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n.cch-blog-safety-flow-num {\r\n  color: #129fe9;\r\n  font-size: 12px;\r\n  line-height: 1.5;\r\n  font-weight: 850;\r\n  letter-spacing: .06em;\r\n}\r\n\r\n.cch-blog-safety-flow-title {\r\n  color: #173041;\r\n  font-size: 15px;\r\n  line-height: 1.5;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-safety-flow-text {\r\n  color: #5b707c;\r\n  font-size: 14px;\r\n  line-height: 1.72;\r\n}\r\n\r\n.cch-blog-safety-function-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #f3f8fb;\r\n}\r\n\r\n.cch-blog-safety-function-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-safety-function-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-safety-function-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-safety-function {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-safety-function h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-safety-function-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-safety-function-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-safety-function-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-safety-flow-row {\r\n    grid-template-columns: 42px 1fr;\r\n    gap: 10px 14px;\r\n  }\r\n\r\n  .cch-blog-safety-flow-text {\r\n    grid-column: 2;\r\n  }\r\n\r\n  .cch-blog-safety-function-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-safety-function\">\r\n\r\n  <div class=\"cch-blog-safety-function-inner\">\r\n\r\n    <div class=\"cch-blog-safety-function-number\">\r\n      04 \u00b7 The Complete Safety Function\r\n    <\/div>\r\n\r\n    <h2>\r\n      How a Safety Light Curtain Fits Into the Safety Function\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-safety-function-lead\">\r\n     A safety light curtain detects interruption of its protective field, but it does not stop hazardous machine motion by itself.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-safety-function-prose\">\r\n\r\n      <p>\r\n        When an object interrupts the protective field, the safety light\r\n        curtain changes the state of its safety outputs. These\r\n        <strong>OSSD signals<\/strong> are then evaluated by an appropriate\r\n        safety-related control system, which initiates the required machine\r\n        response.\r\n      <\/p>\r\n\r\n      <p>\r\n        The effectiveness of the safeguard therefore depends not only on the\r\n        light curtain, but also on how quickly the complete system reacts and\r\n        how long the hazardous machine motion takes to reach the required safe\r\n        state.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-safety-flow\">\r\n\r\n      <div class=\"cch-blog-safety-flow-row\">\r\n\r\n        <div class=\"cch-blog-safety-flow-num\">\r\n          01\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-title\">\r\n          Protective Field Interrupted\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-text\">\r\n          A person, body part or other detectable object enters the active\r\n          sensing field.\r\n        <\/div>\r\n\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-safety-flow-row\">\r\n\r\n        <div class=\"cch-blog-safety-flow-num\">\r\n          02\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-title\">\r\n          OSSD State Changes\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-text\">\r\n          The safety light curtain provides the corresponding safety-related\r\n          output state to the connected control system.\r\n        <\/div>\r\n\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-safety-flow-row\">\r\n\r\n        <div class=\"cch-blog-safety-flow-num\">\r\n          03\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-title\">\r\n          Safety Control Responds\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-text\">\r\n          The safety-related control architecture processes the signal and\r\n          commands the required machine safety response.\r\n        <\/div>\r\n\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-safety-flow-row\">\r\n\r\n        <div class=\"cch-blog-safety-flow-num\">\r\n          04\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-title\">\r\n          Hazardous Motion Reaches a Safe State\r\n        <\/div>\r\n\r\n        <div class=\"cch-blog-safety-flow-text\">\r\n          The machine must reach the required safe condition before a person\r\n          can reach the hazardous area.\r\n        <\/div>\r\n\r\n      <\/div>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-safety-function-prose\">\r\n\r\n      <h3>\r\n        Why This Matters for Type 4 Selection\r\n      <\/h3>\r\n\r\n      <p>\r\n        A Type 4 device provides a high-performance protective-device\r\n        architecture, but the Type classification alone cannot compensate for\r\n        an unsuitable control system, excessive stopping time or incorrect\r\n        safeguard positioning.\r\n      <\/p>\r\n\r\n      <p>\r\n        This is also why safety distance must be calculated using the response\r\n        time of the selected protective device together with the stopping\r\n        performance of the complete machine safety function.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-safety-function-note\">\r\n\r\n      <div class=\"cch-blog-safety-function-note-label\">\r\n        Engineering Note\r\n      <\/div>\r\n\r\n      <strong>\r\n        The light curtain detects. The complete safety function brings the\r\n        machine to the required safe state.\r\n      <\/strong>\r\n\r\n      <p>\r\n        Device Type, control-system architecture, stopping performance and\r\n        safeguard position must therefore be evaluated together rather than\r\n        treated as independent specifications.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-resolution {\r\n  box-sizing: border-box;\r\n  background: #f8fafb;\r\n  padding: 78px 28px 82px;\r\n  border-top: 1px solid #e5ebef;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-resolution * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-resolution-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-resolution-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-resolution h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-resolution-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-resolution-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-resolution-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-resolution-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-resolution-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-resolution-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-resolution-table-wrap {\r\n  overflow-x: auto;\r\n  margin-top: 34px;\r\n  border-top: 2px solid #183746;\r\n  border-bottom: 1px solid #d9e3e8;\r\n}\r\n\r\n.cch-blog-resolution-table {\r\n  width: 100%;\r\n  min-width: 650px;\r\n  border-collapse: collapse;\r\n}\r\n\r\n.cch-blog-resolution-table th,\r\n.cch-blog-resolution-table td {\r\n  padding: 17px 14px;\r\n  border-bottom: 1px solid #dfe7eb;\r\n  text-align: left;\r\n  vertical-align: top;\r\n}\r\n\r\n.cch-blog-resolution-table tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n.cch-blog-resolution-table th {\r\n  color: #173041;\r\n  background: transparent;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .06em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-resolution-table td {\r\n  color: #536975;\r\n  font-size: 14px;\r\n  line-height: 1.68;\r\n}\r\n\r\n.cch-blog-resolution-table td:first-child {\r\n  width: 120px;\r\n  color: #173041;\r\n  font-weight: 850;\r\n}\r\n\r\n.cch-blog-resolution-table td:nth-child(2) {\r\n  width: 150px;\r\n  color: #173041;\r\n  font-weight: 750;\r\n}\r\n\r\n.cch-blog-resolution-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #ffffff;\r\n}\r\n\r\n.cch-blog-resolution-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-resolution-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-resolution-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-resolution-link {\r\n  color: #167ba8 !important;\r\n  font-weight: 750;\r\n  text-decoration: none !important;\r\n  border-bottom: 1px solid rgba(22,123,168,.28);\r\n}\r\n\r\n.cch-blog-resolution-link:hover {\r\n  border-bottom-color: #167ba8;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-resolution {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-resolution h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-resolution-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-resolution-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-resolution-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-resolution-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-resolution\">\r\n\r\n  <div class=\"cch-blog-resolution-inner\">\r\n\r\n    <div class=\"cch-blog-resolution-number\">\r\n      05 \u00b7 Detection Capability\r\n    <\/div>\r\n\r\n    <h2>\r\n      Safety Light Curtain Resolution: 14, 25 and 45 mm\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-resolution-lead\">\r\n      Resolution describes the minimum object size the safety light curtain\r\n      is designed to detect. It is one of the most important selection\r\n      parameters because it affects what can be detected and can influence\r\n      how the safeguard is positioned relative to the hazard.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-resolution-prose\">\r\n\r\n      <p>\r\n        A finer resolution can detect smaller objects within the protective\r\n        field. This is why lower numerical values are commonly associated\r\n        with finger-oriented safeguarding, while larger values may be used\r\n        where hand or access-oriented detection is appropriate.\r\n      <\/p>\r\n\r\n      <p>\r\n        However, resolution should not be interpreted as a safety level.\r\n        A <strong>14 mm Type 4 safety light curtain<\/strong> and a\r\n        <strong>45 mm Type 4 safety light curtain<\/strong> can both belong\r\n        to the same Type 4 device family while serving different detection\r\n        requirements.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-resolution-table-wrap\">\r\n\r\n      <table class=\"cch-blog-resolution-table\">\r\n\r\n        <thead>\r\n          <tr>\r\n            <th>Resolution<\/th>\r\n            <th>Typical Direction<\/th>\r\n            <th>Selection Consideration<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n\r\n        <tbody>\r\n\r\n          <tr>\r\n            <td>14 mm<\/td>\r\n            <td>Fine \/ finger-oriented detection<\/td>\r\n            <td>\r\n              Used where smaller-object detection is required, often closer\r\n              to a hazardous point of operation when the overall safeguarding\r\n              design permits.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td>25 mm<\/td>\r\n            <td>Hand-oriented detection<\/td>\r\n            <td>\r\n              A common medium-resolution choice for machine guarding where\r\n              the required detection capability and safety distance can both\r\n              be satisfied.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td>45 mm<\/td>\r\n            <td>Access-oriented \/ larger-object detection<\/td>\r\n            <td>\r\n              Considered where the safeguarding concept permits a larger\r\n              minimum detectable object size and the approach geometry is\r\n              appropriately controlled.\r\n            <\/td>\r\n          <\/tr>\r\n\r\n        <\/tbody>\r\n\r\n      <\/table>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-resolution-prose\">\r\n\r\n      <h3>\r\n        Why Resolution Affects Safety-Distance Evaluation\r\n      <\/h3>\r\n\r\n      <p>\r\n        Safeguard positioning is not determined only by machine stopping time.\r\n        Detection capability also matters because the selected resolution\r\n        influences how far a person may penetrate toward the hazard before\r\n        the protective device detects the approach.\r\n      <\/p>\r\n\r\n      <p>\r\n        This is one reason a safety-distance value should never be copied\r\n        from another machine simply because the two machines use light curtains\r\n        with the same protection height or similar physical dimensions.\r\n      <\/p>\r\n\r\n      <h3>\r\n        Resolution and Protection Height Are Different Specifications\r\n      <\/h3>\r\n\r\n      <p>\r\n        Resolution describes the detectable object size. Protection height\r\n        describes the vertical or active extent of the sensing field. A taller\r\n        light curtain does not automatically provide finer detection, and a\r\n        finer-resolution light curtain does not automatically provide a taller\r\n        protective field.\r\n      <\/p>\r\n\r\n      <p>\r\n        For example, the current CCH ENT Type 4 family uses\r\n        <strong>14, 25 and 45 mm<\/strong> resolution platforms with\r\n        model-dependent protection heights and response times. The complete\r\n        model therefore needs to be selected rather than choosing from\r\n        resolution alone.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-resolution-note\">\r\n\r\n      <div class=\"cch-blog-resolution-note-label\">\r\n        Engineering Note\r\n      <\/div>\r\n\r\n      <strong>\r\n        Choose resolution from what must be detected \u2014 not from the assumption\r\n        that the smallest number is automatically the best choice.\r\n      <\/strong>\r\n\r\n      <p>\r\n        Detection capability, machine geometry, protection height, response\r\n        time and safety distance should be evaluated together. For current\r\n        CCH model specifications, see the\r\n        <a\r\n          class=\"cch-blog-resolution-link\"\r\n          href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/\">\r\n          ENT Type 4 safety light curtain product page\r\n        <\/a>.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-distance {\r\n  box-sizing: border-box;\r\n  background: #ffffff;\r\n  padding: 78px 28px 82px;\r\n}\r\n\r\n.cch-blog-distance * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-distance-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-distance-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-distance h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-distance-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-distance-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-distance-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-distance-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-distance-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-distance-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-distance-flow {\r\n  margin-top: 36px;\r\n  padding: 6px 0;\r\n  border-top: 1px solid #dce5ea;\r\n  border-bottom: 1px solid #dce5ea;\r\n}\r\n\r\n.cch-blog-distance-row {\r\n  display: grid;\r\n  grid-template-columns: 180px 1fr;\r\n  gap: 24px;\r\n  padding: 19px 0;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-distance-row:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n.cch-blog-distance-term {\r\n  color: #173041;\r\n  font-size: 14px;\r\n  line-height: 1.5;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-distance-text {\r\n  color: #5b707c;\r\n  font-size: 14px;\r\n  line-height: 1.72;\r\n}\r\n\r\n.cch-blog-distance-highlight {\r\n  margin-top: 34px;\r\n  padding: 27px 28px;\r\n  background: #f7f9fa;\r\n  border-top: 2px solid #183746;\r\n}\r\n\r\n.cch-blog-distance-highlight-label {\r\n  margin-bottom: 9px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-distance-highlight strong {\r\n  display: block;\r\n  color: #173041;\r\n  font-size: 20px;\r\n  line-height: 1.45;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-distance-highlight p {\r\n  margin: 10px 0 0;\r\n  color: #586e7a;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-distance-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #f3f8fb;\r\n}\r\n\r\n.cch-blog-distance-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-distance-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-distance-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-distance-link {\r\n  color: #167ba8 !important;\r\n  font-weight: 750;\r\n  text-decoration: none !important;\r\n  border-bottom: 1px solid rgba(22,123,168,.28);\r\n}\r\n\r\n.cch-blog-distance-link:hover {\r\n  border-bottom-color: #167ba8;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-distance {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-distance h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-distance-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-distance-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-distance-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-distance-row {\r\n    grid-template-columns: 1fr;\r\n    gap: 6px;\r\n  }\r\n\r\n  .cch-blog-distance-highlight,\r\n  .cch-blog-distance-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-distance\">\r\n\r\n  <div class=\"cch-blog-distance-inner\">\r\n\r\n    <div class=\"cch-blog-distance-number\">\r\n      06 \u00b7 Safeguard Positioning\r\n    <\/div>\r\n\r\n    <h2>\r\n      Safety Distance and ISO 13855:2024\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-distance-lead\">\r\n      Even the correct Type 4 safety light curtain will not provide effective\r\n      protection if it is installed too close to the hazard. Safety distance\r\n      is intended to provide enough separation for the safety function to act\r\n      before a person can reach the dangerous area.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-distance-prose\">\r\n\r\n      <p>\r\n        ISO 13855:2024 addresses the positioning and dimensioning of safeguards\r\n        with respect to the approach of the human body. For a safety light\r\n        curtain, the required distance depends on more than the response time\r\n        printed in the product datasheet.\r\n      <\/p>\r\n\r\n      <p>\r\n        The calculation must consider the <strong>complete response of the\r\n        safety function<\/strong>: detection by the protective device, signal\r\n        processing in the safety-related control system, and the time required\r\n        for hazardous machine motion to reach the required safe state.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-distance-flow\">\r\n\r\n      <div class=\"cch-blog-distance-row\">\r\n        <div class=\"cch-blog-distance-term\">\r\n          Approach\r\n        <\/div>\r\n        <div class=\"cch-blog-distance-text\">\r\n          How a person can move toward, reach through, reach over or otherwise\r\n          approach the hazardous area affects safeguard positioning.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-distance-row\">\r\n        <div class=\"cch-blog-distance-term\">\r\n          Detection Capability\r\n        <\/div>\r\n        <div class=\"cch-blog-distance-text\">\r\n          Light curtain resolution influences how early an approaching body\r\n          part can be detected and may affect the applicable additional\r\n          distance considerations.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-distance-row\">\r\n        <div class=\"cch-blog-distance-term\">\r\n          Device Response Time\r\n        <\/div>\r\n        <div class=\"cch-blog-distance-text\">\r\n          Use the actual response time of the selected light curtain model,\r\n          not the fastest value from the product family.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-distance-row\">\r\n        <div class=\"cch-blog-distance-term\">\r\n          Control &amp; Stop Time\r\n        <\/div>\r\n        <div class=\"cch-blog-distance-text\">\r\n          The safety control system and machine require additional time to\r\n          process the signal and bring hazardous motion to the required\r\n          safe state.\r\n        <\/div>\r\n      <\/div>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-distance-prose\">\r\n\r\n      <h3>\r\n        Why the Same Light Curtain Can Require Different Distances\r\n      <\/h3>\r\n\r\n      <p>\r\n        Two machines may use exactly the same Type 4 safety light curtain and\r\n        still require different safeguard positions. One machine may stop\r\n        quickly, while another has greater mechanical inertia or a longer\r\n        control-system response.\r\n      <\/p>\r\n\r\n      <p>\r\n        Machine geometry can also change the result. A vertical approach to a\r\n        point of operation is not automatically evaluated in the same way as\r\n        an installation where a person may reach over or around the protective\r\n        field.\r\n      <\/p>\r\n\r\n      <h3>\r\n        Use the Actual ENT Model Response Time\r\n      <\/h3>\r\n\r\n      <p>\r\n        Within the CCH ENT family, response time varies with the selected\r\n        resolution, protection height and model configuration. The final\r\n        safety-distance evaluation should therefore be made only after the\r\n        exact model has been selected.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-distance-highlight\">\r\n\r\n      <div class=\"cch-blog-distance-highlight-label\">\r\n        Practical Principle\r\n      <\/div>\r\n\r\n      <strong>\r\n        Safety distance is a property of the machine application \u2014 not a fixed\r\n        number supplied with the light curtain.\r\n      <\/strong>\r\n\r\n      <p>\r\n        Product response time is one input. Machine stopping performance,\r\n        approach conditions and the complete safeguarding arrangement are also\r\n        part of the engineering decision.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-distance-note\">\r\n\r\n      <div class=\"cch-blog-distance-note-label\">\r\n        Engineering Tool\r\n      <\/div>\r\n\r\n      <strong>\r\n        Calculate the distance for the actual machine.\r\n      <\/strong>\r\n\r\n      <p>\r\n        Use our\r\n        <a\r\n          class=\"cch-blog-distance-link\"\r\n          href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/safety-distance-calculator-iso-13855\/\">\r\n          ISO 13855:2024 Safety Distance Calculator\r\n        <\/a>\r\n        as an engineering aid, using the selected device data and actual\r\n        machine stopping information. Final positioning still requires\r\n        machine-specific risk assessment and validation.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\r\n.cch-blog-appropriate {\r\n  box-sizing: border-box;\r\n  background: #f8fafb;\r\n  padding: 78px 28px 82px;\r\n  border-top: 1px solid #e5ebef;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-appropriate * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.cch-blog-appropriate-inner {\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n}\r\n\r\n.cch-blog-appropriate-number {\r\n  margin-bottom: 14px;\r\n  color: #129fe9;\r\n  font-size: 11px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .11em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-appropriate h2 {\r\n  margin: 0;\r\n  color: #102431;\r\n  font-size: clamp(30px, 4vw, 44px);\r\n  line-height: 1.18;\r\n  font-weight: 800;\r\n  letter-spacing: -.025em;\r\n}\r\n\r\n.cch-blog-appropriate-lead {\r\n  margin: 22px 0 0;\r\n  color: #4f6572;\r\n  font-size: 18px;\r\n  line-height: 1.8;\r\n}\r\n\r\n.cch-blog-appropriate-prose {\r\n  margin-top: 34px;\r\n  color: #526875;\r\n  font-size: 16px;\r\n  line-height: 1.88;\r\n}\r\n\r\n.cch-blog-appropriate-prose p {\r\n  margin: 0 0 22px;\r\n}\r\n\r\n.cch-blog-appropriate-prose p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.cch-blog-appropriate-prose h3 {\r\n  margin: 38px 0 14px;\r\n  color: #173041;\r\n  font-size: 22px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-appropriate-prose strong {\r\n  color: #173041;\r\n}\r\n\r\n.cch-blog-appropriate-sequence {\r\n  margin-top: 36px;\r\n  padding: 4px 0;\r\n  border-top: 1px solid #dce5ea;\r\n  border-bottom: 1px solid #dce5ea;\r\n}\r\n\r\n.cch-blog-appropriate-row {\r\n  display: grid;\r\n  grid-template-columns: 56px 210px 1fr;\r\n  gap: 18px;\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid #e5ebef;\r\n}\r\n\r\n.cch-blog-appropriate-row:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n.cch-blog-appropriate-num {\r\n  color: #129fe9;\r\n  font-size: 12px;\r\n  line-height: 1.5;\r\n  font-weight: 850;\r\n}\r\n\r\n.cch-blog-appropriate-title {\r\n  color: #173041;\r\n  font-size: 15px;\r\n  line-height: 1.5;\r\n  font-weight: 800;\r\n}\r\n\r\n.cch-blog-appropriate-text {\r\n  color: #5b707c;\r\n  font-size: 14px;\r\n  line-height: 1.72;\r\n}\r\n\r\n.cch-blog-appropriate-note {\r\n  margin-top: 34px;\r\n  padding: 24px 26px;\r\n  border-left: 3px solid #129fe9;\r\n  background: #ffffff;\r\n}\r\n\r\n.cch-blog-appropriate-note-label {\r\n  margin-bottom: 8px;\r\n  color: #129fe9;\r\n  font-size: 10px;\r\n  line-height: 1.4;\r\n  font-weight: 850;\r\n  letter-spacing: .1em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.cch-blog-appropriate-note strong {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #173041;\r\n  font-size: 16px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.cch-blog-appropriate-note p {\r\n  margin: 0;\r\n  color: #526875;\r\n  font-size: 14px;\r\n  line-height: 1.78;\r\n}\r\n\r\n.cch-blog-appropriate-link {\r\n  color: #167ba8 !important;\r\n  font-weight: 750;\r\n  text-decoration: none !important;\r\n  border-bottom: 1px solid rgba(22,123,168,.28);\r\n}\r\n\r\n.cch-blog-appropriate-link:hover {\r\n  border-bottom-color: #167ba8;\r\n}\r\n\r\n@media (max-width: 767px) {\r\n  .cch-blog-appropriate {\r\n    padding: 58px 20px 62px;\r\n  }\r\n\r\n  .cch-blog-appropriate h2 {\r\n    font-size: 32px;\r\n  }\r\n\r\n  .cch-blog-appropriate-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .cch-blog-appropriate-prose {\r\n    font-size: 15px;\r\n    line-height: 1.82;\r\n  }\r\n\r\n  .cch-blog-appropriate-prose h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .cch-blog-appropriate-row {\r\n    grid-template-columns: 42px 1fr;\r\n    gap: 8px 14px;\r\n  }\r\n\r\n  .cch-blog-appropriate-text {\r\n    grid-column: 2;\r\n  }\r\n\r\n  .cch-blog-appropriate-note {\r\n    padding: 20px 19px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<section class=\"cch-blog-appropriate\">\r\n\r\n  <div class=\"cch-blog-appropriate-inner\">\r\n\r\n    <div class=\"cch-blog-appropriate-number\">\r\n      07 \u00b7 Selecting the Protective Device\r\n    <\/div>\r\n\r\n    <h2>\r\n      When Is a Type 4 Safety Light Curtain Appropriate?\r\n    <\/h2>\r\n\r\n    <p class=\"cch-blog-appropriate-lead\">\r\n      Type 4 is often considered where a machine safety function requires a\r\n      high level of protective-device performance, but the correct decision\r\n      starts with the machine risk assessment rather than with the product label.\r\n    <\/p>\r\n\r\n    <div class=\"cch-blog-appropriate-prose\">\r\n\r\n      <p>\r\n        A safety light curtain should be selected only after the hazard,\r\n        foreseeable access and required risk reduction have been understood.\r\n        The designer can then determine whether an opto-electronic protective\r\n        device is appropriate and what device classification is required.\r\n      <\/p>\r\n\r\n      <p>\r\n        In some applications, a Type 4 safety light curtain may be an appropriate\r\n        part of the safeguarding concept. In others, a different protective\r\n        device, physical guarding, interlocking, a safety laser scanner, or a\r\n        combination of measures may better address the actual hazard and access\r\n        pattern.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-appropriate-sequence\">\r\n\r\n      <div class=\"cch-blog-appropriate-row\">\r\n        <div class=\"cch-blog-appropriate-num\">01<\/div>\r\n        <div class=\"cch-blog-appropriate-title\">\r\n          Assess the Hazard\r\n        <\/div>\r\n        <div class=\"cch-blog-appropriate-text\">\r\n          Identify the hazardous motion, severity of harm, exposure and\r\n          foreseeable ways a person can reach the danger zone.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-appropriate-row\">\r\n        <div class=\"cch-blog-appropriate-num\">02<\/div>\r\n        <div class=\"cch-blog-appropriate-title\">\r\n          Define the Safety Function\r\n        <\/div>\r\n        <div class=\"cch-blog-appropriate-text\">\r\n          Determine what the safeguarding system must detect and what safe\r\n          machine response must follow when access occurs.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-appropriate-row\">\r\n        <div class=\"cch-blog-appropriate-num\">03<\/div>\r\n        <div class=\"cch-blog-appropriate-title\">\r\n          Select the Device Type\r\n        <\/div>\r\n        <div class=\"cch-blog-appropriate-text\">\r\n          Choose the protective-device classification that supports the\r\n          required safety function and applicable machine-safety requirements.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-appropriate-row\">\r\n        <div class=\"cch-blog-appropriate-num\">04<\/div>\r\n        <div class=\"cch-blog-appropriate-title\">\r\n          Select Detection Capability\r\n        <\/div>\r\n        <div class=\"cch-blog-appropriate-text\">\r\n          Choose resolution and protective-field dimensions according to what\r\n          must be detected and how a person can approach the hazard.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cch-blog-appropriate-row\">\r\n        <div class=\"cch-blog-appropriate-num\">05<\/div>\r\n        <div class=\"cch-blog-appropriate-title\">\r\n          Position and Validate\r\n        <\/div>\r\n        <div class=\"cch-blog-appropriate-text\">\r\n          Determine the required safety distance, integrate the device into the\r\n          safety-related control system and validate the final safeguarding\r\n          arrangement.\r\n        <\/div>\r\n      <\/div>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-appropriate-prose\">\r\n\r\n      <h3>\r\n        Type 4 Does Not Automatically Mean \u201cBest\u201d for Every Application\r\n      <\/h3>\r\n\r\n      <p>\r\n        Selecting the highest available device Type without considering the\r\n        actual machine does not replace engineering analysis. The protective\r\n        device must match the required safety function, detection requirement,\r\n        installation geometry and machine stopping performance.\r\n      <\/p>\r\n\r\n      <p>\r\n        The same principle applies in the opposite direction: a lower device\r\n        Type should not be selected simply because the machine appears simple\r\n        or because the installation cost is lower. The required performance\r\n        must come from the risk assessment and applicable standards.\r\n      <\/p>\r\n\r\n      <h3>\r\n        Safety Light Curtain or Safety Laser Scanner?\r\n      <\/h3>\r\n\r\n      <p>\r\n        Safety light curtains are particularly effective for defined openings\r\n        and linear protective fields. A safety laser scanner may be more suitable\r\n        where a two-dimensional protective area, floor-level access detection\r\n        or configurable protective fields are required.\r\n      <\/p>\r\n\r\n      <p>\r\n        The choice should therefore be based on the geometry of the hazard and\r\n        required protective function rather than on treating the two technologies\r\n        as interchangeable alternatives.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"cch-blog-appropriate-note\">\r\n\r\n      <div class=\"cch-blog-appropriate-note-label\">\r\n        Selection Principle\r\n      <\/div>\r\n\r\n      <strong>\r\n        Start with the required safety function. Select Type 4 only when it fits\r\n        that function and the complete safeguarding design.\r\n      <\/strong>\r\n\r\n      <p>\r\n        For a more detailed comparison of protective-device Types, read the\r\n        <a\r\n          class=\"cch-blog-appropriate-link\"\r\n          href=\"\/blog\/type-2-vs-type-4-risk-based-selection\/\">\r\n          Type 2 vs Type 4 risk-based selection guide\r\n        <\/a>.\r\n        For current CCH Type 4 product specifications, see the\r\n        <a\r\n          class=\"cch-blog-appropriate-link\"\r\n          href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/\">\r\n          ENT Type 4 safety light curtain page\r\n        <\/a>.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n<\/section>\n\n\n\n<style>\n.cch-blog-closing {\n  box-sizing: border-box;\n  background: #ffffff;\n  padding: 78px 28px 86px;\n}\n\n.cch-blog-closing * {\n  box-sizing: border-box;\n}\n\n.cch-blog-closing-inner {\n  max-width: 860px;\n  margin: 0 auto;\n}\n\n.cch-blog-closing-number {\n  margin-bottom: 14px;\n  color: #129fe9;\n  font-size: 11px;\n  line-height: 1.4;\n  font-weight: 800;\n  letter-spacing: .11em;\n  text-transform: uppercase;\n}\n\n.cch-blog-closing h2 {\n  margin: 0;\n  color: #102431;\n  font-size: clamp(30px, 4vw, 44px);\n  line-height: 1.18;\n  font-weight: 800;\n  letter-spacing: -.025em;\n}\n\n.cch-blog-closing-lead {\n  margin: 22px 0 0;\n  color: #4f6572;\n  font-size: 18px;\n  line-height: 1.8;\n}\n\n.cch-blog-faq {\n  margin-top: 40px;\n  border-top: 2px solid #183746;\n}\n\n.cch-blog-faq details {\n  border-bottom: 1px solid #dfe7eb;\n}\n\n.cch-blog-faq summary {\n  position: relative;\n  cursor: pointer;\n  list-style: none;\n  padding: 20px 48px 20px 0;\n  color: #173041;\n  font-size: 16px;\n  line-height: 1.55;\n  font-weight: 800;\n}\n\n.cch-blog-faq summary::-webkit-details-marker {\n  display: none;\n}\n\n.cch-blog-faq summary::after {\n  content: \"+\";\n  position: absolute;\n  top: 19px;\n  right: 4px;\n  color: #129fe9;\n  font-size: 23px;\n  line-height: 1;\n  font-weight: 400;\n}\n\n.cch-blog-faq details[open] summary::after {\n  content: \"\u2212\";\n}\n\n.cch-blog-faq-answer {\n  padding: 0 42px 20px 0;\n  color: #526875;\n  font-size: 15px;\n  line-height: 1.82;\n}\n\n.cch-blog-faq-answer p {\n  margin: 0;\n}\n\n.cch-blog-inline-link {\n  color: #167ba8 !important;\n  font-weight: 750;\n  text-decoration: none !important;\n  border-bottom: 1px solid rgba(22,123,168,.28);\n}\n\n.cch-blog-inline-link:hover {\n  border-bottom-color: #167ba8;\n}\n\n.cch-blog-ref-heading {\n  margin: 54px 0 0;\n  padding-top: 8px;\n  color: #173041;\n  font-size: 24px;\n  line-height: 1.4;\n  font-weight: 800;\n}\n\n.cch-blog-reference-list {\n  margin-top: 22px;\n  border-top: 1px solid #dce5ea;\n}\n\n.cch-blog-reference {\n  display: grid;\n  grid-template-columns: 180px 1fr;\n  gap: 24px;\n  padding: 17px 0;\n  border-bottom: 1px solid #e3eaee;\n}\n\n.cch-blog-reference-name {\n  color: #173041;\n  font-size: 13px;\n  line-height: 1.6;\n  font-weight: 800;\n}\n\n.cch-blog-reference-text {\n  color: #5b707c;\n  font-size: 13px;\n  line-height: 1.68;\n}\n\n.cch-blog-reference-text a {\n  color: #167ba8 !important;\n  font-weight: 700;\n  text-decoration: none !important;\n}\n\n.cch-blog-reference-text a:hover {\n  text-decoration: underline !important;\n}\n\n.cch-blog-related {\n  margin-top: 54px;\n  padding-top: 30px;\n  border-top: 2px solid #183746;\n}\n\n.cch-blog-related h3 {\n  margin: 0;\n  color: #173041;\n  font-size: 24px;\n  line-height: 1.4;\n  font-weight: 800;\n}\n\n.cch-blog-related-intro {\n  margin: 10px 0 0;\n  color: #5b707c;\n  font-size: 14px;\n  line-height: 1.75;\n}\n\n.cch-blog-related-links {\n  margin-top: 23px;\n}\n\n.cch-blog-related-row {\n  display: grid;\n  grid-template-columns: 1fr auto;\n  gap: 20px;\n  align-items: center;\n  padding: 17px 0;\n  border-bottom: 1px solid #e2e9ed;\n}\n\n.cch-blog-related-row:first-child {\n  border-top: 1px solid #e2e9ed;\n}\n\n.cch-blog-related-title {\n  color: #173041;\n  font-size: 15px;\n  line-height: 1.5;\n  font-weight: 750;\n}\n\n.cch-blog-related-row a {\n  color: #167ba8 !important;\n  font-size: 13px;\n  line-height: 1.5;\n  font-weight: 750;\n  text-decoration: none !important;\n  white-space: nowrap;\n}\n\n.cch-blog-related-row a:hover {\n  text-decoration: underline !important;\n}\n\n.cch-blog-closing-note {\n  margin-top: 38px;\n  padding: 24px 26px;\n  border-left: 3px solid #129fe9;\n  background: #f3f8fb;\n}\n\n.cch-blog-closing-note-label {\n  margin-bottom: 8px;\n  color: #129fe9;\n  font-size: 10px;\n  line-height: 1.4;\n  font-weight: 850;\n  letter-spacing: .1em;\n  text-transform: uppercase;\n}\n\n.cch-blog-closing-note strong {\n  display: block;\n  margin-bottom: 7px;\n  color: #173041;\n  font-size: 16px;\n  line-height: 1.5;\n}\n\n.cch-blog-closing-note p {\n  margin: 0;\n  color: #526875;\n  font-size: 14px;\n  line-height: 1.78;\n}\n\n@media (max-width: 767px) {\n  .cch-blog-closing {\n    padding: 58px 20px 64px;\n  }\n\n  .cch-blog-closing h2 {\n    font-size: 32px;\n  }\n\n  .cch-blog-closing-lead {\n    font-size: 17px;\n  }\n\n  .cch-blog-faq summary {\n    padding-right: 38px;\n    font-size: 15px;\n  }\n\n  .cch-blog-faq-answer {\n    padding-right: 22px;\n  }\n\n  .cch-blog-reference {\n    grid-template-columns: 1fr;\n    gap: 5px;\n  }\n\n  .cch-blog-related-row {\n    grid-template-columns: 1fr;\n    gap: 6px;\n  }\n\n  .cch-blog-related-row a {\n    white-space: normal;\n  }\n\n  .cch-blog-closing-note {\n    padding: 20px 19px;\n  }\n}\n<\/style>\n\n<section class=\"cch-blog-closing\">\n\n  <div class=\"cch-blog-closing-inner\">\n\n    <div class=\"cch-blog-closing-number\">\n      08 \u00b7 FAQ &amp; Engineering Resources\n    <\/div>\n\n    <h2>\n      Type 4 Safety Light Curtain Guide FAQ\n    <\/h2>\n\n    <p class=\"cch-blog-closing-lead\">\n      The questions below summarize the most important points when evaluating\n      Type 4 safety light curtains for industrial machine safeguarding.\n    <\/p>\n\n    <div class=\"cch-blog-faq\">\n\n      <details>\n        <summary>\n          What is a Type 4 safety light curtain?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            A Type 4 safety light curtain is an active opto-electronic\n            protective device designed to meet Type 4 requirements within the\n            IEC 61496 framework. The Type describes characteristics of the\n            protective device itself and should not be treated as the overall\n            safety rating of the machine.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          Does Type 4 automatically mean Cat. 4, PL e or SIL 3?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            No. Type 4, Category 4, Performance Level and SIL belong to related\n            but different parts of functional-safety engineering. A Type 4\n            protective device can be used in safety functions requiring high\n            performance, but the achieved machine-level performance depends on\n            the complete safety-related control architecture and validation.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          Should I choose 14, 25 or 45 mm safety light curtain resolution?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            Choose the resolution from what must be detected and how a person\n            can approach the hazard. Lower numerical resolutions provide finer\n            detection capability. The selected resolution must then be\n            evaluated together with protection height, response time and\n            required safety distance.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          Is Type 4 always required for a high-risk machine?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            The required protective-device Type should come from the machine\n            risk assessment, required safety function and applicable standards.\n            Machine type alone should not be used as a shortcut for selecting\n            Type 2 or Type 4. See the\n            <a class=\"cch-blog-inline-link\" href=\"\/blog\/type-2-vs-type-4-risk-based-selection\/\">\n              Type 2 vs Type 4 selection guide\n            <\/a>.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          How far should a Type 4 safety light curtain be from the hazard?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            There is no universal distance. Safeguard positioning depends on\n            approach conditions, detection capability, protective-device\n            response time, safety-control response and machine stopping\n            performance. Use the actual machine data and the applicable\n            ISO 13855 methodology.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          Does Type 4 determine the IP protection rating?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            No. Functional-safety Type and environmental ingress protection\n            are separate product characteristics. For example, the current\n            CCH ENT Type 4 platform has an IP65 enclosure rating, but IP65 is\n            not part of the definition of Type 4.\n          <\/p>\n        <\/div>\n      <\/details>\n\n      <details>\n        <summary>\n          Safety light curtain or safety laser scanner \u2014 which should I use?\n        <\/summary>\n\n        <div class=\"cch-blog-faq-answer\">\n          <p>\n            Safety light curtains are well suited to defined openings and\n            linear protective fields. Safety laser scanners can be more\n            appropriate where a two-dimensional protective area or configurable\n            protective-field geometry is needed. Selection should follow the\n            hazard geometry and required safety function.\n          <\/p>\n        <\/div>\n      <\/details>\n\n    <\/div>\n\n    <h3 class=\"cch-blog-ref-heading\">\n      Standards Referenced in This Guide\n    <\/h3>\n\n    <div class=\"cch-blog-reference-list\">\n\n      <div class=\"cch-blog-reference\">\n\n        <div class=\"cch-blog-reference-name\">\n          IEC 61496-1:2020\n        <\/div>\n\n        <div class=\"cch-blog-reference-text\">\n          General requirements and tests for electro-sensitive protective\n          equipment.\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/63115\" target=\"_blank\" rel=\"noopener\">\n            IEC official publication \u2192\n          <\/a>\n        <\/div>\n\n      <\/div>\n\n      <div class=\"cch-blog-reference\">\n\n        <div class=\"cch-blog-reference-name\">\n          IEC 61496-2:2020\n        <\/div>\n\n        <div class=\"cch-blog-reference-text\">\n          Particular requirements for active opto-electronic protective\n          devices such as safety light curtains.\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/63117\" target=\"_blank\" rel=\"noopener\">\n            IEC official publication \u2192\n          <\/a>\n        <\/div>\n\n      <\/div>\n\n      <div class=\"cch-blog-reference\">\n\n        <div class=\"cch-blog-reference-name\">\n          ISO 13849-1:2023\n        <\/div>\n\n        <div class=\"cch-blog-reference-text\">\n          Design principles for safety-related parts of control systems.\n          <a href=\"https:\/\/www.iso.org\/standard\/73481.html\" target=\"_blank\" rel=\"noopener\">\n            ISO official publication \u2192\n          <\/a>\n        <\/div>\n\n      <\/div>\n\n      <div class=\"cch-blog-reference\">\n\n        <div class=\"cch-blog-reference-name\">\n          ISO 13855:2024\n        <\/div>\n\n        <div class=\"cch-blog-reference-text\">\n          Positioning and dimensioning of safeguards with respect to the\n          approach of the human body.\n          <a href=\"https:\/\/www.iso.org\/standard\/80590.html\" target=\"_blank\" rel=\"noopener\">\n            ISO official publication \u2192\n          <\/a>\n        <\/div>\n\n      <\/div>\n\n    <\/div>\n\n    <div class=\"cch-blog-related\">\n\n      <h3>\n        Related Engineering Resources\n      <\/h3>\n\n      <p class=\"cch-blog-related-intro\">\n        Continue with the topic that matches your next engineering question.\n      <\/p>\n\n      <div class=\"cch-blog-related-links\">\n\n        <div class=\"cch-blog-related-row\">\n          <div class=\"cch-blog-related-title\">\n            ENT Type 4 Safety Light Curtain\n          <\/div>\n          <a href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/\">\n            Product specifications \u2192\n          <\/a>\n        <\/div>\n\n        <div class=\"cch-blog-related-row\">\n          <div class=\"cch-blog-related-title\">\n            Type 2 vs Type 4 Safety Light Curtains\n          <\/div>\n          <a href=\"\/blog\/type-2-vs-type-4-risk-based-selection\/\">\n            Read the comparison \u2192\n          <\/a>\n        <\/div>\n\n        <div class=\"cch-blog-related-row\">\n          <div class=\"cch-blog-related-title\">\n            ISO 13855:2024 Safety Distance Calculator\n          <\/div>\n          <a href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/safety-distance-calculator-iso-13855\/\">\n            Open the calculator \u2192\n          <\/a>\n        <\/div>\n\n        <div class=\"cch-blog-related-row\">\n          <div class=\"cch-blog-related-title\">\n            Safety Area Scanner Engineering Guide\n          <\/div>\n          <a href=\"\/blog\/safety-area-scanner\/\">\n            Compare safeguarding concepts \u2192\n          <\/a>\n        <\/div>\n\n      <\/div>\n\n    <\/div>\n\n    <div class=\"cch-blog-closing-note\">\n\n      <div class=\"cch-blog-closing-note-label\">\n        Application Support\n      <\/div>\n\n      <strong>\n        Need to match these principles to a specific machine?\n      <\/strong>\n\n      <p>\n        If you already know the hazard location, required detection capability,\n        protection height, installation distance and machine stopping\n        information, you can\n        <a class=\"cch-blog-inline-link\" href=\"\/contact-us\/\">\n          discuss the application with CCH\n        <\/a>.\n      <\/p>\n\n    <\/div>\n\n  <\/div>\n\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Engineering Guide Safety Light Curtains Updated September 2026 Type 4 Safety Light Curtain Guide: Standards, Selection &amp; Integration Type 4 is a functional-safety classification for active opto-electronic protective devices, but selecting a Type 4 safety light curtain requires more than choosing the highest device type. Detection capability, machine risk, safety distance and the complete safety [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":1434,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[12],"tags":[],"class_list":["post-1335","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-type-4-safety-light-curtain-blogs"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/posts\/1335","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/comments?post=1335"}],"version-history":[{"count":0,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/posts\/1335\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/media\/1434"}],"wp:attachment":[{"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/media?parent=1335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/categories?post=1335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/pt\/wp-json\/wp\/v2\/tags?post=1335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}