{"id":2722,"date":"2026-06-05T03:01:06","date_gmt":"2026-06-05T03:01:06","guid":{"rendered":"https:\/\/industrialsafetysensor.com\/?p=2722"},"modified":"2026-09-08T14:55:07","modified_gmt":"2026-09-08T14:55:07","slug":"type-2-vs-type-4-risk-based-selection","status":"publish","type":"post","link":"https:\/\/industrialsafetysensor.com\/fr\/blog\/type-2-vs-type-4-risk-based-selection\/","title":{"rendered":"Rideaux lumineux de s\u00e9curit\u00e9 de type 2 ou de type 4 : arbre de d\u00e9cision de s\u00e9lection bas\u00e9 sur les risques"},"content":{"rendered":"\n<style>\n\/* =========================================================\n   TYPE 2 VS TYPE 4 LIGHT CURTAIN GUIDE\n   SECTION 01 \u00b7 INTRO \u00b7 NO IMAGE FINAL\n   ========================================================= *\/\n\n.t2t4-intro {\n  box-sizing: border-box;\n  position: relative;\n  overflow: hidden;\n  padding: 92px 28px 90px;\n  background:\n    radial-gradient(circle at 86% 15%, rgba(18,159,233,.11), transparent 30%),\n    linear-gradient(180deg, #f8fbfd 0%, #ffffff 100%);\n  border-bottom: 1px solid #e4edf2;\n}\n\n.t2t4-intro *,\n.t2t4-intro *::before,\n.t2t4-intro *::after {\n  box-sizing: border-box;\n}\n\n.t2t4-intro-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n  display: grid;\n  grid-template-columns: 1.03fr .97fr;\n  gap: 58px;\n  align-items: center;\n}\n\n\/* =========================================================\n   LEFT CONTENT\n   ========================================================= *\/\n\n.t2t4-eyebrow {\n  display: flex;\n  align-items: center;\n  gap: 11px;\n  margin-bottom: 20px;\n  color: #607c8f;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-eyebrow::before {\n  content: \"\";\n  width: 34px;\n  height: 3px;\n  border-radius: 99px;\n  background: #129fe9;\n}\n\n.t2t4-intro h2 {\n  margin: 0;\n  color: #102f45;\n  font-size: clamp(40px, 4.8vw, 62px);\n  line-height: 1.06;\n  letter-spacing: 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padding: 13px 20px;\n  border-radius: 8px;\n  font-size: 14px;\n  font-weight: 800;\n  text-decoration: none !important;\n  transition: .18s ease;\n}\n\n.t2t4-btn:hover {\n  transform: translateY(-1px);\n}\n\n.t2t4-btn-primary {\n  color: #ffffff !important;\n  background: #129fe9;\n  box-shadow: 0 8px 20px rgba(18,159,233,.16);\n}\n\n.t2t4-btn-secondary {\n  color: #173b54 !important;\n  background: #ffffff;\n  border: 1px solid #cfdee7;\n}\n\n\/* =========================================================\n   RIGHT COMPARISON PANEL\n   ========================================================= *\/\n\n.t2t4-compare {\n  padding: 24px;\n  border: 1px solid #d9e7ee;\n  border-radius: 24px;\n  background:\n    linear-gradient(rgba(39,78,103,.035) 1px, transparent 1px),\n    linear-gradient(90deg, rgba(39,78,103,.035) 1px, transparent 1px),\n    #ffffff;\n  background-size: 30px 30px;\n  box-shadow: 0 22px 54px rgba(21,60,83,.09);\n}\n\n.t2t4-compare-head {\n  padding: 4px 4px 19px;\n  border-bottom: 1px solid #e4edf2;\n}\n\n.t2t4-compare-label {\n  color: #698394;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .1em;\n  text-transform: uppercase;\n}\n\n.t2t4-compare-head h3 {\n  margin: 8px 0 0;\n  color: #173b54;\n  font-size: 21px;\n  line-height: 1.35;\n}\n\n.t2t4-compare-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 14px;\n  margin-top: 18px;\n}\n\n\/* Type cards *\/\n\n.t2t4-type-card {\n  overflow: hidden;\n  border: 1px solid #dbe7ed;\n  border-radius: 17px;\n  background: rgba(255,255,255,.96);\n}\n\n.t2t4-type-top {\n  padding: 22px 20px 19px;\n  border-bottom: 1px solid #e3edf2;\n}\n\n.t2t4-type2 .t2t4-type-top {\n  border-top: 4px solid #8da5b4;\n}\n\n.t2t4-type4 .t2t4-type-top {\n  border-top: 4px solid #129fe9;\n}\n\n.t2t4-type-name {\n  color: #173b54;\n  font-size: 27px;\n  font-weight: 900;\n  letter-spacing: -.02em;\n}\n\n.t2t4-type-level {\n  margin-top: 7px;\n  color: #5d7688;\n  font-size: 12px;\n  font-weight: 700;\n  line-height: 1.55;\n}\n\n.t2t4-type-body {\n  padding: 18px 20px 20px;\n}\n\n.t2t4-spec {\n  padding: 13px 0;\n  border-bottom: 1px solid #e7eef2;\n}\n\n.t2t4-spec:last-child {\n  border-bottom: 0;\n}\n\n.t2t4-spec-label {\n  display: block;\n  margin-bottom: 4px;\n  color: #78909f;\n  font-size: 9px;\n  font-weight: 900;\n  letter-spacing: .07em;\n  text-transform: uppercase;\n}\n\n.t2t4-spec-value {\n  display: block;\n  color: #173b54;\n  font-size: 13px;\n  font-weight: 800;\n  line-height: 1.45;\n}\n\n.t2t4-type2 .t2t4-spec-value strong {\n  color: #6d8797;\n}\n\n.t2t4-type4 .t2t4-spec-value strong {\n  color: #129fe9;\n}\n\n\/* Decision note *\/\n\n.t2t4-decision {\n  margin-top: 16px;\n  padding: 17px 18px;\n  border-radius: 12px;\n  background: #102f45;\n}\n\n.t2t4-decision-label {\n  margin-bottom: 6px;\n  color: #58c2f5;\n  font-size: 9px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-decision p {\n  margin: 0;\n  color: #c3d5df;\n  font-size: 12px;\n  line-height: 1.65;\n}\n\n.t2t4-decision strong {\n  color: #ffffff;\n}\n\n\/* =========================================================\n   RESPONSIVE\n   ========================================================= *\/\n\n@media (max-width: 1020px) {\n\n  .t2t4-intro-inner {\n    grid-template-columns: 1fr;\n    gap: 46px;\n  }\n\n  .t2t4-compare {\n    max-width: 760px;\n    width: 100%;\n  }\n}\n\n@media (max-width: 620px) {\n\n  .t2t4-intro {\n    padding: 64px 20px 70px;\n  }\n\n  .t2t4-intro h2 {\n    font-size: clamp(36px, 10vw, 48px);\n  }\n\n  .t2t4-lead {\n    font-size: 16px;\n  }\n\n  .t2t4-actions {\n    display: grid;\n  }\n\n  .t2t4-btn {\n    width: 100%;\n  }\n\n  .t2t4-compare {\n    padding: 17px;\n    border-radius: 18px;\n  }\n\n  .t2t4-compare-grid {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n\n<section class=\"t2t4-intro\" aria-labelledby=\"t2t4-intro-title\">\n\n  <div class=\"t2t4-intro-inner\">\n\n    <!-- LEFT -->\n\n    <div>\n\n      <div class=\"t2t4-eyebrow\">\n        01 \u00b7 Safety Light Curtain Guide\n      <\/div>\n\n      <h2 id=\"t2t4-intro-title\">\n        Type 2 vs Type 4\n        <span>Safety Light Curtains<\/span>\n      <\/h2>\n\n      <p class=\"t2t4-lead\">\n        The main difference between a <strong>Type 2<\/strong> and\n        <strong>Type 4 safety light curtain<\/strong> is the level of\n        safety performance and fault behaviour required by IEC 61496\u2014not\n        simply resolution, sensing range or the number of processors inside\n        the device.\n      <\/p>\n\n      <p class=\"t2t4-copy\">\n        Type selection should follow the required safety performance of the\n        machine application. A higher Type classification can support a higher\n        maximum safety level, but the complete safety function still depends\n        on risk assessment, control-system design, stopping performance and\n        validation.\n      <\/p>\n\n      <div class=\"t2t4-scope\">\n\n        <div class=\"t2t4-scope-label\">\n          Current CCH Product Scope\n        <\/div>\n\n        <p>\n          CCH&#8217;s current international ENT safety light curtain range is\n          <strong>Type 4<\/strong>. Type 2 and Type 3 are discussed in this\n          article for standards education and engineering comparison; they are\n          not presented as current CCH international product lines.\n        <\/p>\n\n      <\/div>\n\n      <div class=\"t2t4-actions\">\n\n        <a href=\"\/safety-light-curtains\/\" class=\"t2t4-btn t2t4-btn-primary\">\n          View ENT Type 4 Light Curtains \u2192\n        <\/a>\n\n        <a href=\"#t2t4-types\" class=\"t2t4-btn t2t4-btn-secondary\">\n          Compare Type Classes \u2192\n        <\/a>\n\n      <\/div>\n\n    <\/div>\n\n\n    <!-- RIGHT -->\n\n    <div class=\"t2t4-compare\">\n\n      <div class=\"t2t4-compare-head\">\n\n        <div class=\"t2t4-compare-label\">\n          IEC 61496 Comparison\n        <\/div>\n\n        <h3>\n          Same sensing concept. Different maximum safety capability.\n        <\/h3>\n\n      <\/div>\n\n\n      <div class=\"t2t4-compare-grid\">\n\n        <!-- TYPE 2 -->\n\n        <div class=\"t2t4-type-card t2t4-type2\">\n\n          <div class=\"t2t4-type-top\">\n\n            <div class=\"t2t4-type-name\">\n              Type 2\n            <\/div>\n\n            <div class=\"t2t4-type-level\">\n              Maximum application capability:\n              <strong>PL c \/ SIL CL 1<\/strong>\n            <\/div>\n\n          <\/div>\n\n          <div class=\"t2t4-type-body\">\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                IEC 61496 Classification\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                <strong>Type 2<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                ISO 13849-1\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Applications up to <strong>PL c<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                IEC 62061\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Applications up to <strong>SIL CL 1<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                Effective Aperture Angle\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Up to <strong>\u00b15\u00b0<\/strong> at \u22653 m\n              <\/span>\n            <\/div>\n\n          <\/div>\n\n        <\/div>\n\n\n        <!-- TYPE 4 -->\n\n        <div class=\"t2t4-type-card t2t4-type4\">\n\n          <div class=\"t2t4-type-top\">\n\n            <div class=\"t2t4-type-name\">\n              Type 4\n            <\/div>\n\n            <div class=\"t2t4-type-level\">\n              Maximum application capability:\n              <strong>PL e \/ SIL CL 3<\/strong>\n            <\/div>\n\n          <\/div>\n\n          <div class=\"t2t4-type-body\">\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                IEC 61496 Classification\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                <strong>Type 4<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                ISO 13849-1\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Applications up to <strong>PL e<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                IEC 62061\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Applications up to <strong>SIL CL 3<\/strong>\n              <\/span>\n            <\/div>\n\n            <div class=\"t2t4-spec\">\n              <span class=\"t2t4-spec-label\">\n                Effective Aperture Angle\n              <\/span>\n              <span class=\"t2t4-spec-value\">\n                Up to <strong>\u00b12.5\u00b0<\/strong> at \u22653 m\n              <\/span>\n            <\/div>\n\n          <\/div>\n\n        <\/div>\n\n      <\/div>\n\n\n      <div class=\"t2t4-decision\">\n\n        <div class=\"t2t4-decision-label\">\n          Selection Rule\n        <\/div>\n\n        <p>\n          Select the device Type from the <strong>required PLr, risk\n          assessment and applicable machine standard<\/strong>\u2014not simply from\n          the machine name, price or detection resolution.\n        <\/p>\n\n      <\/div>\n\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 02 \u00b7 IEC 61496 TYPE CLASSIFICATION\n   ========================================================= *\/\n\n.t2t4-types {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #ffffff;\n}\n\n.t2t4-types * {\n  box-sizing: border-box;\n}\n\n.t2t4-types-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-types-head {\n  max-width: 930px;\n  margin-bottom: 45px;\n}\n\n.t2t4-types-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-types-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-types h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-types-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-types-grid {\n  display: grid;\n  grid-template-columns: repeat(3, 1fr);\n  gap: 18px;\n}\n\n.t2t4-type {\n  padding: 28px;\n  border: 1px solid #dbe7ed;\n  border-radius: 18px;\n  background: #f9fcfd;\n}\n\n.t2t4-type2 {\n  border-top: 4px solid #8ba4b3;\n}\n\n.t2t4-type3 {\n  border-top: 4px solid #58a9d2;\n}\n\n.t2t4-type4 {\n  border-top: 4px solid #129fe9;\n}\n\n.t2t4-type-number {\n  color: #129fe9;\n  font-size: 11px;\n  font-weight: 900;\n  letter-spacing: .08em;\n  text-transform: uppercase;\n}\n\n.t2t4-type h3 {\n  margin: 10px 0 0;\n  color: #173b54;\n  font-size: 24px;\n}\n\n.t2t4-type-level {\n  margin-top: 14px;\n  padding: 11px 12px;\n  border-radius: 9px;\n  background: #edf8fd;\n}\n\n.t2t4-type-level strong {\n  display: block;\n  color: #166182;\n  font-size: 12px;\n}\n\n.t2t4-type-level span {\n  display: block;\n  margin-top: 3px;\n  color: #557587;\n  font-size: 11px;\n}\n\n.t2t4-type p {\n  margin: 15px 0 0;\n  color: #657e8f;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-standard-box {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 17px;\n  margin-top: 26px;\n}\n\n.t2t4-standard {\n  padding: 24px;\n  border: 1px solid #dbe7ed;\n  border-radius: 15px;\n  background: #ffffff;\n}\n\n.t2t4-standard strong {\n  display: block;\n  color: #173b54;\n  font-size: 15px;\n}\n\n.t2t4-standard p {\n  margin: 8px 0 0;\n  color: #667f90;\n  font-size: 13px;\n  line-height: 1.68;\n}\n\n.t2t4-type-note {\n  margin-top: 24px;\n  padding: 19px 21px;\n  border-left: 4px solid #129fe9;\n  background: #edf8fd;\n  color: #4e7083;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 900px) {\n  .t2t4-types-grid {\n    grid-template-columns: 1fr;\n  }\n}\n\n@media (max-width: 680px) {\n  .t2t4-types {\n    padding: 68px 20px 74px;\n  }\n\n  .t2t4-standard-box {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-types\" id=\"t2t4-types\" aria-labelledby=\"t2t4-types-title\">\n\n  <div class=\"t2t4-types-inner\">\n\n    <div class=\"t2t4-types-head\">\n\n      <div class=\"t2t4-types-kicker\">\n        <span>02<\/span> IEC 61496 Classification\n      <\/div>\n\n      <h2 id=\"t2t4-types-title\">\n        Type 2, Type 3 and Type 4 Light Curtains\n      <\/h2>\n\n      <p class=\"t2t4-types-intro\">\n        IEC 61496 defines Type classifications for electro-sensitive\n        protective equipment. Current light curtain technology includes\n        Type 2, Type 3 and Type 4 devices.\n      <\/p>\n\n    <\/div>\n\n\n    <div class=\"t2t4-types-grid\">\n\n      <article class=\"t2t4-type t2t4-type2\">\n\n        <div class=\"t2t4-type-number\">\n          Type 2\n        <\/div>\n\n        <h3>Up to PL c<\/h3>\n\n        <div class=\"t2t4-type-level\">\n          <strong>ISO 13849-1<\/strong>\n          <span>Applications up to PL c<\/span>\n        <\/div>\n\n        <div class=\"t2t4-type-level\">\n          <strong>IEC 62061<\/strong>\n          <span>Applications up to SIL CL 1<\/span>\n        <\/div>\n\n        <p>\n          Type 2 devices provide a lower maximum safety capability than\n          Type 3 or Type 4 devices and are appropriate only where the required\n          safety performance does not exceed that capability.\n        <\/p>\n\n      <\/article>\n\n\n      <article class=\"t2t4-type t2t4-type3\">\n\n        <div class=\"t2t4-type-number\">\n          Type 3\n        <\/div>\n\n        <h3>Up to PL d<\/h3>\n\n        <div class=\"t2t4-type-level\">\n          <strong>ISO 13849-1<\/strong>\n          <span>Applications up to PL d<\/span>\n        <\/div>\n\n        <div class=\"t2t4-type-level\">\n          <strong>IEC 62061<\/strong>\n          <span>Applications up to SIL CL 2<\/span>\n        <\/div>\n\n        <p>\n          Type 3 light curtains are part of the current IEC 61496 framework\n          and provide an intermediate safety capability between Type 2 and\n          Type 4.\n        <\/p>\n\n      <\/article>\n\n\n      <article class=\"t2t4-type t2t4-type4\">\n\n        <div class=\"t2t4-type-number\">\n          Type 4\n        <\/div>\n\n        <h3>Up to PL e<\/h3>\n\n        <div class=\"t2t4-type-level\">\n          <strong>ISO 13849-1<\/strong>\n          <span>Applications up to PL e<\/span>\n        <\/div>\n\n        <div class=\"t2t4-type-level\">\n          <strong>IEC 62061<\/strong>\n          <span>Applications up to SIL CL 3<\/span>\n        <\/div>\n\n        <p>\n          Type 4 provides the highest Type classification commonly used for\n          safety light curtains and supports applications requiring safety\n          performance up to PL e \/ SIL CL 3.\n        <\/p>\n\n      <\/article>\n\n    <\/div>\n\n\n    <div class=\"t2t4-standard-box\">\n\n      <div class=\"t2t4-standard\">\n        <strong>IEC 61496-1<\/strong>\n        <p>\n          Defines general requirements and tests for electro-sensitive\n          protective equipment.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2t4-standard\">\n        <strong>IEC 61496-2<\/strong>\n        <p>\n          Defines particular requirements for active opto-electronic\n          protective devices such as safety light curtains.\n        <\/p>\n      <\/div>\n\n    <\/div>\n\n\n    <div class=\"t2t4-type-note\">\n      A Type classification establishes the maximum device capability. It does\n      not by itself prove that the complete machine safety function achieves\n      PL c, PL d, PL e or a particular SIL level.\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 03 \u00b7 TYPE \/ CATEGORY \/ PL \/ SIL\n   FINAL RELEASE\n   ========================================================= *\/\n\n.t2t4-levels {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #f7fafc;\n}\n\n.t2t4-levels * {\n  box-sizing: border-box;\n}\n\n.t2t4-levels-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-levels-head {\n  max-width: 930px;\n  margin-bottom: 45px;\n}\n\n.t2t4-levels-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-levels-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-levels h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-levels-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-level-grid {\n  display: grid;\n  grid-template-columns: repeat(4, 1fr);\n  gap: 16px;\n}\n\n.t2t4-level-card {\n  padding: 25px;\n  border: 1px solid #dbe7ed;\n  border-radius: 16px;\n  background: #ffffff;\n}\n\n.t2t4-level-code {\n  margin-bottom: 10px;\n  color: #129fe9;\n  font-size: 11px;\n  font-weight: 900;\n}\n\n.t2t4-level-card h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 19px;\n}\n\n.t2t4-level-card p {\n  margin: 9px 0 0;\n  color: #688090;\n  font-size: 13px;\n  line-height: 1.68;\n}\n\n.t2t4-not-equal {\n  margin-top: 27px;\n  padding: 30px;\n  border-radius: 19px;\n  background: #102f45;\n}\n\n.t2t4-not-equal-label {\n  color: #58c2f5;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .1em;\n  text-transform: uppercase;\n}\n\n.t2t4-not-equal h3 {\n  margin: 9px 0 0;\n  color: #ffffff;\n  font-size: 25px;\n}\n\n.t2t4-equation {\n  margin-top: 20px;\n  color: #ffffff;\n  font-size: clamp(24px, 4vw, 36px);\n  font-weight: 900;\n  letter-spacing: -.02em;\n}\n\n.t2t4-not-equal p {\n  margin: 15px 0 0;\n  color: #bfd0da;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n.t2t4-pl {\n  margin-top: 26px;\n  padding: 28px;\n  border: 1px solid #d5e8f2;\n  border-radius: 18px;\n  background: #edf8fd;\n}\n\n.t2t4-pl-label {\n  margin-bottom: 9px;\n  color: #0d80ba;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-pl h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 22px;\n}\n\n.t2t4-pl-intro {\n  margin: 10px 0 0;\n  color: #557487;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-pl-grid {\n  display: grid;\n  grid-template-columns: repeat(5, 1fr);\n  gap: 11px;\n  margin-top: 19px;\n}\n\n.t2t4-pl-item {\n  padding: 16px;\n  border: 1px solid #d2e4ed;\n  border-radius: 11px;\n  background: #ffffff;\n}\n\n.t2t4-pl-item strong {\n  display: block;\n  color: #173b54;\n  font-size: 13px;\n}\n\n.t2t4-pl-item span {\n  display: block;\n  margin-top: 5px;\n  color: #687f90;\n  font-size: 11px;\n  line-height: 1.55;\n}\n\n.t2t4-example {\n  margin-top: 22px;\n  padding: 20px 22px;\n  border-left: 4px solid #129fe9;\n  background: #ffffff;\n  color: #4e7083;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 1000px) {\n  .t2t4-level-grid {\n    grid-template-columns: 1fr 1fr;\n  }\n\n  .t2t4-pl-grid {\n    grid-template-columns: 1fr 1fr;\n  }\n}\n\n@media (max-width: 620px) {\n  .t2t4-levels {\n    padding: 68px 20px 74px;\n  }\n\n  .t2t4-level-grid,\n  .t2t4-pl-grid {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-levels\" aria-labelledby=\"t2t4-levels-title\">\n\n  <div class=\"t2t4-levels-inner\">\n\n    <div class=\"t2t4-levels-head\">\n\n      <div class=\"t2t4-levels-kicker\">\n        <span>03<\/span> Do Not Mix the Terms\n      <\/div>\n\n      <h2 id=\"t2t4-levels-title\">\n        Type, Category, PL and SIL Are Not the Same Thing\n      <\/h2>\n\n      <p class=\"t2t4-levels-intro\">\n        These terms belong to related but different parts of functional-safety\n        engineering. Treating them as interchangeable can lead to incorrect\n        device selection or incorrect claims about the complete machine safety\n        function.\n      <\/p>\n\n    <\/div>\n\n    <div class=\"t2t4-level-grid\">\n\n      <article class=\"t2t4-level-card\">\n        <div class=\"t2t4-level-code\">IEC 61496<\/div>\n        <h3>Type<\/h3>\n        <p>\n          Classification of the electro-sensitive protective device itself,\n          including its required safety performance, testing and fault\n          behaviour.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-level-card\">\n        <div class=\"t2t4-level-code\">ISO 13849-1<\/div>\n        <h3>Category<\/h3>\n        <p>\n          Describes structural characteristics of the safety-related control\n          system architecture and its behaviour under relevant faults.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-level-card\">\n        <div class=\"t2t4-level-code\">ISO 13849-1<\/div>\n        <h3>PL \/ PLr<\/h3>\n        <p>\n          PL describes the achieved performance of a safety function. PLr is\n          the required Performance Level determined for the application.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-level-card\">\n        <div class=\"t2t4-level-code\">IEC 62061<\/div>\n        <h3>SIL \/ SIL CL<\/h3>\n        <p>\n          Safety Integrity Level concepts are used within another functional\n          safety framework for safety-related control functions.\n        <\/p>\n      <\/article>\n\n    <\/div>\n\n    <div class=\"t2t4-not-equal\">\n\n      <div class=\"t2t4-not-equal-label\">\n        Critical Distinction\n      <\/div>\n\n      <h3>\n        Do Not Convert the Labels Mechanically\n      <\/h3>\n\n      <div class=\"t2t4-equation\">\n        Type 2 \u2260 Category 2\n      <\/div>\n\n      <p>\n        A Type 2 safety light curtain is not called \u201cType 2\u201d because the\n        complete machine uses ISO 13849 Category 2 architecture. Likewise, a\n        Type 4 light curtain does not automatically make the complete safety\n        function Category 4 or PL e.\n      <\/p>\n\n    <\/div>\n\n    <div class=\"t2t4-pl\">\n\n      <div class=\"t2t4-pl-label\">\n        What Determines the Achieved Performance Level?\n      <\/div>\n\n      <h3>\n        PL Is a Property of the Complete Safety Function\n      <\/h3>\n\n      <p class=\"t2t4-pl-intro\">\n        Evaluation under ISO 13849-1 considers the safety-related control\n        system as a whole. Important engineering concepts include:\n      <\/p>\n\n      <div class=\"t2t4-pl-grid\">\n\n        <div class=\"t2t4-pl-item\">\n          <strong>Category<\/strong>\n          <span>Safety-related architecture and fault behaviour<\/span>\n        <\/div>\n\n        <div class=\"t2t4-pl-item\">\n          <strong>MTTFd<\/strong>\n          <span>Reliability contribution of relevant components<\/span>\n        <\/div>\n\n        <div class=\"t2t4-pl-item\">\n          <strong>DCavg<\/strong>\n          <span>Average diagnostic coverage of the safety system<\/span>\n        <\/div>\n\n        <div class=\"t2t4-pl-item\">\n          <strong>CCF<\/strong>\n          <span>Measures addressing common-cause failures<\/span>\n        <\/div>\n\n        <div class=\"t2t4-pl-item\">\n          <strong>PFHd<\/strong>\n          <span>Probability of dangerous failure per hour for the safety function<\/span>\n        <\/div>\n\n      <\/div>\n\n    <\/div>\n\n    <div class=\"t2t4-example\">\n      A Type 4 safety light curtain can be suitable for use in a safety\n      function requiring a high Performance Level, but the achieved PL still\n      depends on the complete SRP\/CS design, downstream safety logic and output\n      devices, diagnostics, reliability calculations and validation.\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 04 \u00b7 FAULT BEHAVIOUR & EAA\n   FINAL RELEASE\n   ========================================================= *\/\n\n.t2t4-faults {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #ffffff;\n}\n\n.t2t4-faults * {\n  box-sizing: border-box;\n}\n\n.t2t4-faults-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-faults-head {\n  max-width: 930px;\n  margin-bottom: 44px;\n}\n\n.t2t4-faults-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-faults-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-faults h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-faults-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-fault-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 19px;\n}\n\n.t2t4-fault-card {\n  padding: 28px;\n  border: 1px solid #dbe7ed;\n  border-radius: 18px;\n  background: #f9fcfd;\n}\n\n.t2t4-fault-label {\n  margin-bottom: 10px;\n  color: #129fe9;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .08em;\n  text-transform: uppercase;\n}\n\n.t2t4-fault-card h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 23px;\n  line-height: 1.35;\n}\n\n.t2t4-fault-card p {\n  margin: 11px 0 0;\n  color: #657e8f;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n.t2t4-fault-note {\n  margin-top: 20px;\n  padding: 18px 20px;\n  border-left: 4px solid #129fe9;\n  background: #edf8fd;\n  color: #4e7083;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-eaa {\n  margin-top: 27px;\n  padding: 30px;\n  border-radius: 19px;\n  background: #102f45;\n}\n\n.t2t4-eaa-label {\n  color: #58c2f5;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .1em;\n  text-transform: uppercase;\n}\n\n.t2t4-eaa h3 {\n  margin: 9px 0 0;\n  color: #ffffff;\n  font-size: 24px;\n}\n\n.t2t4-eaa-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 14px;\n  margin-top: 20px;\n}\n\n.t2t4-eaa-card {\n  padding: 20px;\n  border: 1px solid rgba(196,222,235,.16);\n  border-radius: 13px;\n  background: rgba(255,255,255,.05);\n}\n\n.t2t4-eaa-card strong {\n  display: block;\n  color: #ffffff;\n  font-size: 17px;\n}\n\n.t2t4-eaa-sub {\n  display: block;\n  margin-top: 4px;\n  color: #91acbb;\n  font-size: 10px;\n  font-weight: 800;\n  letter-spacing: .05em;\n  text-transform: uppercase;\n}\n\n.t2t4-eaa-value {\n  margin-top: 9px;\n  color: #58c2f5;\n  font-size: 27px;\n  font-weight: 900;\n}\n\n.t2t4-eaa-card p {\n  margin: 8px 0 0;\n  color: #bed0da;\n  font-size: 12px;\n  line-height: 1.62;\n}\n\n.t2t4-eaa-note {\n  margin-top: 18px;\n  color: #bfd0da;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-reflection-note {\n  margin-top: 23px;\n  padding: 19px 21px;\n  border-left: 4px solid #129fe9;\n  background: #edf8fd;\n  color: #4e7083;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 760px) {\n  .t2t4-faults {\n    padding: 68px 20px 74px;\n  }\n\n  .t2t4-fault-grid,\n  .t2t4-eaa-grid {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-faults\" aria-labelledby=\"t2t4-faults-title\">\n\n  <div class=\"t2t4-faults-inner\">\n\n    <div class=\"t2t4-faults-head\">\n\n      <div class=\"t2t4-faults-kicker\">\n        <span>04<\/span> Device Behaviour\n      <\/div>\n\n      <h2 id=\"t2t4-faults-title\">\n        Fault Detection &amp; Effective Aperture Angle\n      <\/h2>\n\n      <p class=\"t2t4-faults-intro\">\n        IEC 61496 Type classification is defined by required safety\n        performance, testing and fault behaviour\u2014not by a universal hardware\n        rule such as \u201cone CPU versus two CPUs.\u201d Manufacturers may use different\n        internal architectures to meet the applicable Type requirements.\n      <\/p>\n\n    <\/div>\n\n    <div class=\"t2t4-fault-grid\">\n\n      <article class=\"t2t4-fault-card\">\n\n        <div class=\"t2t4-fault-label\">\n          Type 2\n        <\/div>\n\n        <h3>\n          Periodic Testing &amp; Lower Maximum Safety Capability\n        <\/h3>\n\n        <p>\n          Type 2 devices must satisfy the testing and fault-behaviour\n          requirements applicable to their classification. Their maximum use\n          is limited to safety functions requiring performance up to PL c \/\n          SIL CL 1.\n        <\/p>\n\n      <\/article>\n\n      <article class=\"t2t4-fault-card\">\n\n        <div class=\"t2t4-fault-label\">\n          Type 4\n        <\/div>\n\n        <h3>\n          More Demanding Fault-Detection &amp; Fault-Behaviour Requirements\n        <\/h3>\n\n        <p>\n          Type 4 devices must satisfy more demanding requirements for fault\n          detection and behaviour under relevant faults. This supports use in\n          safety functions requiring performance up to PL e \/ SIL CL 3 when\n          the complete safety architecture is designed accordingly.\n        <\/p>\n\n      <\/article>\n\n    <\/div>\n\n    <div class=\"t2t4-fault-note\">\n      The number of processors, diagnostic architecture and internal circuitry\n      are implementation choices made by the manufacturer. They should not be\n      used as the general definition of Type 2 or Type 4.\n    <\/div>\n\n    <div class=\"t2t4-eaa\">\n\n      <div class=\"t2t4-eaa-label\">\n        Effective Aperture Angle \u00b7 EAA\n      <\/div>\n\n      <h3>\n        Type 2 and Type 4 Also Differ in Optical Requirements\n      <\/h3>\n\n      <div class=\"t2t4-eaa-grid\">\n\n        <div class=\"t2t4-eaa-card\">\n\n          <strong>Type 2<\/strong>\n\n          <span class=\"t2t4-eaa-sub\">\n            IEC 61496-2 Comparison\n          <\/span>\n\n          <div class=\"t2t4-eaa-value\">\n            Up to \u00b15\u00b0\n          <\/div>\n\n          <p>\n            Effective aperture angle under the applicable comparison condition\n            at operating distances of 3 m or greater.\n          <\/p>\n\n        <\/div>\n\n        <div class=\"t2t4-eaa-card\">\n\n          <strong>Type 4<\/strong>\n\n          <span class=\"t2t4-eaa-sub\">\n            IEC 61496-2 Comparison\n          <\/span>\n\n          <div class=\"t2t4-eaa-value\">\n            Up to \u00b12.5\u00b0\n          <\/div>\n\n          <p>\n            Narrower effective aperture angle under the corresponding\n            comparison condition at operating distances of 3 m or greater.\n          <\/p>\n\n        <\/div>\n\n      <\/div>\n\n      <div class=\"t2t4-eaa-note\">\n        The narrower optical angle associated with Type 4 requirements helps\n        reduce the possibility that reflected light forms an unintended\n        optical path around an obstruction. Product-specific installation\n        instructions must still be followed.\n      <\/div>\n\n    <\/div>\n\n    <div class=\"t2t4-reflection-note\">\n      Reflective machine panels, polished metal, mirrors and other highly\n      reflective surfaces can affect safety light curtain installation.\n      Maintain the minimum distance from reflective surfaces specified in the\n      selected product&#8217;s operating instructions.\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 05 \u00b7 RISK ASSESSMENT\n   ========================================================= *\/\n\n.t2t4-risk {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #f7fafc;\n}\n\n.t2t4-risk * {\n  box-sizing: border-box;\n}\n\n.t2t4-risk-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-risk-head {\n  max-width: 930px;\n  margin-bottom: 45px;\n}\n\n.t2t4-risk-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-risk-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-risk h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-risk-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-risk-flow {\n  display: grid;\n  grid-template-columns: repeat(4, 1fr);\n  gap: 15px;\n}\n\n.t2t4-risk-step {\n  padding: 24px;\n  border: 1px solid #dbe7ed;\n  border-radius: 16px;\n  background: #ffffff;\n}\n\n.t2t4-risk-num {\n  margin-bottom: 10px;\n  color: #129fe9;\n  font-size: 10px;\n  font-weight: 900;\n}\n\n.t2t4-risk-step h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 17px;\n}\n\n.t2t4-risk-step p {\n  margin: 8px 0 0;\n  color: #688090;\n  font-size: 13px;\n  line-height: 1.67;\n}\n\n.t2t4-risk-result {\n  margin-top: 27px;\n  padding: 29px;\n  border-radius: 18px;\n  background: #102f45;\n}\n\n.t2t4-risk-result-label {\n  color: #58c2f5;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-risk-result h3 {\n  margin: 9px 0 0;\n  color: #ffffff;\n  font-size: 24px;\n}\n\n.t2t4-risk-result p {\n  margin: 12px 0 0;\n  color: #bfd0da;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n.t2t4-risk-apps {\n  display: grid;\n  grid-template-columns: repeat(4, 1fr);\n  gap: 13px;\n  margin-top: 23px;\n}\n\n.t2t4-risk-app {\n  padding: 18px;\n  border: 1px solid #dbe7ed;\n  border-radius: 13px;\n  background: #ffffff;\n}\n\n.t2t4-risk-app strong {\n  display: block;\n  color: #173b54;\n  font-size: 14px;\n}\n\n.t2t4-risk-app span {\n  display: block;\n  margin-top: 5px;\n  color: #6a8191;\n  font-size: 11px;\n  line-height: 1.55;\n}\n\n.t2t4-risk-note {\n  margin-top: 22px;\n  padding: 19px 21px;\n  border-left: 4px solid #d7a21c;\n  background: #fffaf0;\n  color: #75632e;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 950px) {\n  .t2t4-risk-flow,\n  .t2t4-risk-apps {\n    grid-template-columns: 1fr 1fr;\n  }\n}\n\n@media (max-width: 620px) {\n  .t2t4-risk {\n    padding: 68px 20px 74px;\n  }\n\n  .t2t4-risk-flow,\n  .t2t4-risk-apps {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-risk\" aria-labelledby=\"t2t4-risk-title\">\n\n  <div class=\"t2t4-risk-inner\">\n\n    <div class=\"t2t4-risk-head\">\n\n      <div class=\"t2t4-risk-kicker\">\n        <span>05<\/span> Risk Assessment\n      <\/div>\n\n      <h2 id=\"t2t4-risk-title\">\n        When Is a Type 4 Safety Light Curtain Required?\n      <\/h2>\n\n      <p class=\"t2t4-risk-intro\">\n        The correct question is not \u201cWhich machine normally uses Type 2?\u201d but\n        \u201cWhat safety performance is required for this safety function?\u201d\n      <\/p>\n\n    <\/div>\n\n\n    <div class=\"t2t4-risk-flow\">\n\n      <article class=\"t2t4-risk-step\">\n        <div class=\"t2t4-risk-num\">01<\/div>\n        <h3>Identify the Hazard<\/h3>\n        <p>\n          Define the hazardous motion, possible injury and how personnel can\n          access the hazard zone.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-risk-step\">\n        <div class=\"t2t4-risk-num\">02<\/div>\n        <h3>Determine Required PLr<\/h3>\n        <p>\n          Use the applicable risk-assessment method and machine requirements\n          to determine the required safety performance.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-risk-step\">\n        <div class=\"t2t4-risk-num\">03<\/div>\n        <h3>Check Type-C Standards<\/h3>\n        <p>\n          A machine-specific Type-C standard may impose particular\n          safeguarding requirements or required safety performance.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-risk-step\">\n        <div class=\"t2t4-risk-num\">04<\/div>\n        <h3>Select the ESPE Type<\/h3>\n        <p>\n          Choose a device Type whose maximum capability is sufficient for the\n          required safety function.\n        <\/p>\n      <\/article>\n\n    <\/div>\n\n\n    <div class=\"t2t4-risk-result\">\n\n      <div class=\"t2t4-risk-result-label\">\n        Selection Principle\n      <\/div>\n\n      <h3>\n        If the Required Performance Exceeds Type 2 Capability, Type 2 Is Not Suitable\n      <\/h3>\n\n      <p>\n        A Type 2 light curtain is limited to applications up to PL c \/\n        SIL CL 1. If the required safety function is PL d, PL e, SIL CL 2 or\n        SIL CL 3, the protective device must have adequate capability and the\n        complete safety architecture must be designed accordingly.\n      <\/p>\n\n    <\/div>\n\n\n    <div class=\"t2t4-risk-apps\">\n\n      <div class=\"t2t4-risk-app\">\n        <strong>Packaging Machinery<\/strong>\n        <span>Assess the specific hazard and required PLr.<\/span>\n      <\/div>\n\n      <div class=\"t2t4-risk-app\">\n        <strong>Conveyor Systems<\/strong>\n        <span>Do not assign Type based only on the machine category.<\/span>\n      <\/div>\n\n      <div class=\"t2t4-risk-app\">\n        <strong>Robot Cells<\/strong>\n        <span>Consider access routes and the complete safeguarding concept.<\/span>\n      <\/div>\n\n      <div class=\"t2t4-risk-app\">\n        <strong>Point of Operation<\/strong>\n        <span>Evaluate severity, exposure and stopping performance carefully.<\/span>\n      <\/div>\n\n    <\/div>\n\n\n    <div class=\"t2t4-risk-note\">\n      Machine names do not determine the Type. Two packaging machines can have\n      very different hazards, access conditions, stopping behaviour and\n      required Performance Levels.\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 06 \u00b7 RESOLUTION & SAFETY DISTANCE\n   ========================================================= *\/\n\n.t2t4-distance {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #ffffff;\n}\n\n.t2t4-distance * {\n  box-sizing: border-box;\n}\n\n.t2t4-distance-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-distance-head {\n  max-width: 930px;\n  margin-bottom: 44px;\n}\n\n.t2t4-distance-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-distance-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-distance h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-distance-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-distance-grid {\n  display: grid;\n  grid-template-columns: repeat(3, 1fr);\n  gap: 18px;\n}\n\n.t2t4-distance-card {\n  padding: 27px;\n  border: 1px solid #dbe7ed;\n  border-radius: 17px;\n  background: #f9fcfd;\n}\n\n.t2t4-distance-card h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 21px;\n}\n\n.t2t4-distance-card p {\n  margin: 10px 0 0;\n  color: #687f90;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-distance-card strong {\n  color: #173b54;\n}\n\n.t2t4-ent {\n  margin-top: 26px;\n  padding: 27px;\n  border: 1px solid #d5e8f2;\n  border-radius: 18px;\n  background: #edf8fd;\n}\n\n.t2t4-ent-label {\n  color: #0d80ba;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-ent h3 {\n  margin: 9px 0 0;\n  color: #173b54;\n  font-size: 22px;\n}\n\n.t2t4-ent-grid {\n  display: grid;\n  grid-template-columns: repeat(3, 1fr);\n  gap: 12px;\n  margin-top: 18px;\n}\n\n.t2t4-ent-item {\n  padding: 16px;\n  border: 1px solid #d2e4ed;\n  border-radius: 11px;\n  background: #ffffff;\n}\n\n.t2t4-ent-item strong {\n  display: block;\n  color: #173b54;\n  font-size: 14px;\n}\n\n.t2t4-ent-item span {\n  display: block;\n  margin-top: 4px;\n  color: #687f90;\n  font-size: 11px;\n}\n\n.t2t4-calculator {\n  display: grid;\n  grid-template-columns: 1fr auto;\n  gap: 26px;\n  align-items: center;\n  margin-top: 27px;\n  padding: 29px;\n  border-radius: 18px;\n  background: #102f45;\n}\n\n.t2t4-calculator-label {\n  color: #58c2f5;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-calculator h3 {\n  margin: 8px 0 0;\n  color: #ffffff;\n  font-size: 23px;\n}\n\n.t2t4-calculator p {\n  margin: 9px 0 0;\n  max-width: 760px;\n  color: #bfd0da;\n  font-size: 13px;\n  line-height: 1.7;\n}\n\n.t2t4-calculator-btn {\n  display: inline-flex;\n  align-items: center;\n  justify-content: center;\n  min-height: 51px;\n  padding: 13px 19px;\n  border-radius: 8px;\n  background: #129fe9;\n  color: #ffffff !important;\n  font-size: 13px;\n  font-weight: 900;\n  text-decoration: none !important;\n  white-space: nowrap;\n}\n\n.t2t4-distance-note {\n  margin-top: 23px;\n  padding: 19px 21px;\n  border-left: 4px solid #129fe9;\n  background: #edf8fd;\n  color: #4e7083;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 900px) {\n  .t2t4-distance-grid,\n  .t2t4-ent-grid {\n    grid-template-columns: 1fr;\n  }\n\n  .t2t4-calculator {\n    grid-template-columns: 1fr;\n  }\n}\n\n@media (max-width: 620px) {\n  .t2t4-distance {\n    padding: 68px 20px 74px;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-distance\" aria-labelledby=\"t2t4-distance-title\">\n\n  <div class=\"t2t4-distance-inner\">\n\n    <div class=\"t2t4-distance-head\">\n\n      <div class=\"t2t4-distance-kicker\">\n        <span>06<\/span> Installation Engineering\n      <\/div>\n\n      <h2 id=\"t2t4-distance-title\">\n        Resolution, Safety Distance &amp; Installation\n      <\/h2>\n\n      <p class=\"t2t4-distance-intro\">\n        Safety light curtain Type and detection resolution are separate design\n        choices. Resolution affects what can be detected and influences\n        safeguard positioning, while Type defines the device&#8217;s safety\n        classification.\n      <\/p>\n\n    <\/div>\n\n\n    <div class=\"t2t4-distance-grid\">\n\n      <article class=\"t2t4-distance-card\">\n\n        <h3>Type<\/h3>\n\n        <p>\n          Defines the safety-device classification and maximum functional\n          safety capability under IEC 61496.\n        <\/p>\n\n      <\/article>\n\n\n      <article class=\"t2t4-distance-card\">\n\n        <h3>Resolution<\/h3>\n\n        <p>\n          Defines the detection capability of the light curtain. A Type 2,\n          Type 3 or Type 4 product can exist with fine resolution; resolution\n          alone does not identify the Type.\n        <\/p>\n\n      <\/article>\n\n\n      <article class=\"t2t4-distance-card\">\n\n        <h3>Safety Distance<\/h3>\n\n        <p>\n          Depends on approach geometry, total safety-system response time,\n          detection capability, reaching conditions and the actual machine\n          stopping performance.\n        <\/p>\n\n      <\/article>\n\n    <\/div>\n\n\n    <div class=\"t2t4-ent\">\n\n      <div class=\"t2t4-ent-label\">\n        Current CCH ENT Type 4 Range\n      <\/div>\n\n      <h3>\n        Three Detection-Resolution Platforms\n      <\/h3>\n\n      <div class=\"t2t4-ent-grid\">\n\n        <div class=\"t2t4-ent-item\">\n          <strong>ENT14<\/strong>\n          <span>14 mm detection resolution<\/span>\n        <\/div>\n\n        <div class=\"t2t4-ent-item\">\n          <strong>ENT25<\/strong>\n          <span>25 mm detection resolution<\/span>\n        <\/div>\n\n        <div class=\"t2t4-ent-item\">\n          <strong>ENT45<\/strong>\n          <span>45 mm detection resolution<\/span>\n        <\/div>\n\n      <\/div>\n\n    <\/div>\n\n\n    <div class=\"t2t4-calculator\">\n\n      <div>\n\n        <div class=\"t2t4-calculator-label\">\n          ISO 13855:2024 Engineering Tool\n        <\/div>\n\n        <h3>\n          Calculate Safety Light Curtain Separation Distance\n        <\/h3>\n\n        <p>\n          Use our updated ISO 13855:2024 calculator to evaluate preliminary\n          separation distance using actual response time, stopping time and\n          reaching-distance conditions.\n        <\/p>\n\n      <\/div>\n\n      <a href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/safety-distance-calculator-iso-13855\/\" class=\"t2t4-calculator-btn\">\n        Open Safety Distance Calculator \u2192\n      <\/a>\n\n    <\/div>\n\n\n    <div class=\"t2t4-distance-note\">\n      ISO 13855:2024 is the current international edition for positioning and\n      dimensioning safeguards with respect to human approach. The 2010 edition\n      has been withdrawn. Always validate the final installation against the\n      applicable standard and actual machine stopping behaviour.\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 07 \u00b7 SELECTION CHECKLIST\n   FINAL RELEASE\n   ========================================================= *\/\n\n.t2t4-select {\n  box-sizing: border-box;\n  padding: 88px 28px 94px;\n  background: #f7fafc;\n}\n\n.t2t4-select * {\n  box-sizing: border-box;\n}\n\n.t2t4-select-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-select-head {\n  max-width: 930px;\n  margin-bottom: 44px;\n}\n\n.t2t4-select-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-select-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-select h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-select-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-select-grid {\n  display: grid;\n  grid-template-columns: repeat(4, 1fr);\n  gap: 16px;\n}\n\n.t2t4-select-card {\n  padding: 23px;\n  border: 1px solid #dbe7ed;\n  border-radius: 16px;\n  background: #ffffff;\n}\n\n.t2t4-select-num {\n  margin-bottom: 10px;\n  color: #129fe9;\n  font-size: 10px;\n  font-weight: 900;\n}\n\n.t2t4-select-card h3 {\n  margin: 0;\n  color: #173b54;\n  font-size: 17px;\n  line-height: 1.4;\n}\n\n.t2t4-select-card p {\n  margin: 8px 0 0;\n  color: #688090;\n  font-size: 13px;\n  line-height: 1.66;\n}\n\n.t2t4-select-final {\n  margin-top: 27px;\n  padding: 28px;\n  border-radius: 18px;\n  background: #102f45;\n}\n\n.t2t4-select-final-label {\n  color: #58c2f5;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .09em;\n  text-transform: uppercase;\n}\n\n.t2t4-select-final h3 {\n  margin: 9px 0 0;\n  color: #ffffff;\n  font-size: 23px;\n}\n\n.t2t4-select-final p {\n  margin: 11px 0 0;\n  color: #bfd0da;\n  font-size: 14px;\n  line-height: 1.72;\n}\n\n@media (max-width: 1000px) {\n  .t2t4-select-grid {\n    grid-template-columns: 1fr 1fr;\n  }\n}\n\n@media (max-width: 620px) {\n  .t2t4-select {\n    padding: 68px 20px 74px;\n  }\n\n  .t2t4-select-grid {\n    grid-template-columns: 1fr;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-select\" aria-labelledby=\"t2t4-select-title\">\n\n  <div class=\"t2t4-select-inner\">\n\n    <div class=\"t2t4-select-head\">\n\n      <div class=\"t2t4-select-kicker\">\n        <span>07<\/span> Engineering Checklist\n      <\/div>\n\n      <h2 id=\"t2t4-select-title\">\n        Type 2 vs Type 4 Selection Checklist\n      <\/h2>\n\n      <p class=\"t2t4-select-intro\">\n        Before selecting a safety light curtain, verify the complete\n        safeguarding requirement rather than comparing only price, sensing\n        range or one headline specification.\n      <\/p>\n\n    <\/div>\n\n    <div class=\"t2t4-select-grid\">\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">01<\/div>\n        <h3>Required PLr<\/h3>\n        <p>\n          Determine the required performance of the safety function from the\n          machine risk assessment.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">02<\/div>\n        <h3>Type-C Standard<\/h3>\n        <p>\n          Check whether a machine-specific standard defines particular\n          safeguarding requirements or minimum safety performance.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">03<\/div>\n        <h3>Detection Resolution<\/h3>\n        <p>\n          Select the detection capability required for the body part or access\n          condition that must be detected.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">04<\/div>\n        <h3>Safety Distance<\/h3>\n        <p>\n          Determine safeguard positioning using actual device response,\n          control response and measured machine stopping performance.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">05<\/div>\n        <h3>Reflective Surfaces<\/h3>\n        <p>\n          Evaluate nearby reflective materials and maintain the optical\n          clearance required by the product instructions.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">06<\/div>\n        <h3>OSSD, EDM &amp; Safety Circuit<\/h3>\n        <p>\n          Confirm the OSSD interface, external device monitoring (EDM)\n          requirements where applicable, and compatibility with the safety\n          relay, safety PLC and downstream switching devices.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">07<\/div>\n        <h3>Environment<\/h3>\n        <p>\n          Consider contamination, temperature, vibration, enclosure rating,\n          ambient conditions and installation geometry.\n        <\/p>\n      <\/article>\n\n      <article class=\"t2t4-select-card\">\n        <div class=\"t2t4-select-num\">08<\/div>\n        <h3>Validation &amp; Maintenance<\/h3>\n        <p>\n          Plan commissioning tests, periodic inspection and maintenance of the\n          complete safety function.\n        <\/p>\n      <\/article>\n\n    <\/div>\n\n    <div class=\"t2t4-select-final\">\n\n      <div class=\"t2t4-select-final-label\">\n        Cost Is Not the First Decision\n      <\/div>\n\n      <h3>\n        Type Classification Alone Does Not Predict Project Cost\n      <\/h3>\n\n      <p>\n        Actual cost depends on protective height, detection resolution, range,\n        functions, interfaces, accessories, certification, safety architecture\n        and integration requirements. There is no universal percentage by\n        which every Type 4 safety light curtain costs more than every Type 2\n        light curtain.\n      <\/p>\n\n    <\/div>\n\n  <\/div>\n\n<\/section>\n<style>\n\/* =========================================================\n   SECTION 08 \u00b7 FAQ + CTA\n   ========================================================= *\/\n\n.t2t4-faq {\n  box-sizing: border-box;\n  padding: 88px 28px 0;\n  background: #ffffff;\n}\n\n.t2t4-faq * {\n  box-sizing: border-box;\n}\n\n.t2t4-faq-inner {\n  max-width: 1220px;\n  margin: 0 auto;\n}\n\n.t2t4-faq-head {\n  max-width: 930px;\n  margin-bottom: 42px;\n}\n\n.t2t4-faq-kicker {\n  margin-bottom: 14px;\n  color: #647f91;\n  font-size: 12px;\n  font-weight: 800;\n  letter-spacing: .12em;\n  text-transform: uppercase;\n}\n\n.t2t4-faq-kicker span {\n  margin-right: 10px;\n  color: #129fe9;\n}\n\n.t2t4-faq h2 {\n  margin: 0;\n  color: #12364e;\n  font-size: clamp(32px, 4vw, 46px);\n  line-height: 1.13;\n  letter-spacing: -.03em;\n}\n\n.t2t4-faq-intro {\n  margin: 20px 0 0;\n  color: #5d7688;\n  font-size: 17px;\n  line-height: 1.75;\n}\n\n.t2t4-faq-list {\n  display: grid;\n  gap: 11px;\n}\n\n.t2t4-faq-item {\n  overflow: hidden;\n  border: 1px solid #dbe7ed;\n  border-radius: 13px;\n  background: #f9fcfd;\n}\n\n.t2t4-faq-item summary {\n  position: relative;\n  cursor: pointer;\n  list-style: none;\n  padding: 20px 55px 20px 21px;\n  color: #173b54;\n  font-size: 15px;\n  line-height: 1.5;\n  font-weight: 800;\n}\n\n.t2t4-faq-item summary::-webkit-details-marker {\n  display: none;\n}\n\n.t2t4-faq-item summary::after {\n  content: \"+\";\n  position: absolute;\n  right: 20px;\n  top: 50%;\n  transform: translateY(-50%);\n  color: #129fe9;\n  font-size: 24px;\n}\n\n.t2t4-faq-item[open] summary::after {\n  content: \"\u2212\";\n}\n\n.t2t4-faq-answer {\n  padding: 0 21px 21px;\n  color: #657f90;\n  font-size: 14px;\n  line-height: 1.73;\n}\n\n.t2t4-faq-answer p {\n  margin: 0;\n}\n\n.t2t4-final {\n  position: relative;\n  overflow: hidden;\n  margin-top: 68px;\n  padding: 56px 52px;\n  border-radius: 24px 24px 0 0;\n  background:\n    radial-gradient(circle at 86% 16%, rgba(18,159,233,.23), transparent 34%),\n    #102f45;\n}\n\n.t2t4-final-label {\n  margin-bottom: 12px;\n  color: #59c1f4;\n  font-size: 10px;\n  font-weight: 900;\n  letter-spacing: .1em;\n  text-transform: uppercase;\n}\n\n.t2t4-final h3 {\n  margin: 0;\n  max-width: 820px;\n  color: #ffffff;\n  font-size: clamp(30px, 4vw, 43px);\n  line-height: 1.15;\n  letter-spacing: -.03em;\n}\n\n.t2t4-final p {\n  max-width: 780px;\n  margin: 17px 0 0;\n  color: #bed0da;\n  font-size: 15px;\n  line-height: 1.75;\n}\n\n.t2t4-final-actions {\n  display: flex;\n  flex-wrap: wrap;\n  gap: 13px;\n  margin-top: 27px;\n}\n\n.t2t4-final-btn {\n  display: inline-flex;\n  align-items: center;\n  justify-content: center;\n  min-height: 50px;\n  padding: 12px 19px;\n  border-radius: 8px;\n  font-size: 13px;\n  font-weight: 800;\n  text-decoration: none !important;\n}\n\n.t2t4-final-primary {\n  color: #ffffff !important;\n  background: #129fe9;\n}\n\n.t2t4-final-secondary {\n  color: #e1edf4 !important;\n  border: 1px solid rgba(202,225,237,.3);\n}\n\n@media (max-width: 620px) {\n  .t2t4-faq {\n    padding: 68px 20px 0;\n  }\n\n  .t2t4-final {\n    padding: 43px 25px;\n  }\n\n  .t2t4-final-actions {\n    display: grid;\n  }\n}\n<\/style>\n\n<section class=\"t2t4-faq\" aria-labelledby=\"t2t4-faq-title\">\n\n  <div class=\"t2t4-faq-inner\">\n\n    <div class=\"t2t4-faq-head\">\n\n      <div class=\"t2t4-faq-kicker\">\n        <span>08<\/span> Common Questions\n      <\/div>\n\n      <h2 id=\"t2t4-faq-title\">\n        Type 2 vs Type 4 Safety Light Curtain FAQ\n      <\/h2>\n\n      <p class=\"t2t4-faq-intro\">\n        Common questions about IEC 61496 Type classification, PL, SIL,\n        resolution, safety distance and CCH&#8217;s current ENT product scope.\n      <\/p>\n\n    <\/div>\n\n\n    <div class=\"t2t4-faq-list\">\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          What is the main difference between Type 2 and Type 4 safety light curtains?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            The main difference is the required safety performance and fault\n            behaviour under IEC 61496. Type 2 can support applications up to\n            PL c \/ SIL CL 1, while Type 4 can support applications up to\n            PL e \/ SIL CL 3 when the complete safety function is designed\n            accordingly.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Is a Type 2 safety light curtain SIL 1 or SIL 2?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Type 2 light curtains are associated with applications up to\n            SIL CL 1 under IEC 62061 and up to PL c under ISO 13849-1.\n            Type 2 should not be described as a SIL 2 light curtain.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Is Type 2 the same as Category 2?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            No. Type 2 is an IEC 61496 classification of the protective device.\n            Category 2 is an ISO 13849-1 architecture concept for the\n            safety-related control system. They are different classifications.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Does a Type 4 light curtain automatically make a machine PL e?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            No. The light curtain is only one part of the safety function.\n            The achieved Performance Level depends on the complete control\n            architecture, safety outputs, logic, final switching devices,\n            diagnostics, reliability and validation.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Are there Type 3 safety light curtains?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Yes. Type 3 light curtains exist under the current IEC 61496\n            framework and can support applications up to PL d \/ SIL CL 2.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Can a Type 2 safety light curtain have 14 mm resolution?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Yes. Type classification and detection resolution are different\n            characteristics. Type 2, Type 3 and Type 4 light curtains can\n            exist with fine detection resolutions, depending on the product\n            design.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Is Type 4 always required for machine guarding?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Not automatically. The required device capability should follow\n            the machine risk assessment, required PLr and any applicable\n            machine-specific Type-C standard.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Is a Type 4 safety light curtain safer than Type 2?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Type 4 has a higher maximum safety capability and more demanding\n            fault-behaviour requirements. However, correct safeguarding still\n            depends on the complete system design and installation.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Is Type 4 always more expensive than Type 2?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Product Type alone does not determine price. Cost varies with\n            protective height, resolution, range, functions, interfaces,\n            accessories, certification, manufacturer and integration\n            requirements. There is no universal Type 4 price premium.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Why is effective aperture angle important?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Effective aperture angle relates to the optical directional\n            behaviour of the emitter and receiver. A narrower angle helps\n            reduce the influence of unintended optical paths caused by nearby\n            reflective surfaces.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          How do I calculate safety light curtain distance?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            Safety distance depends on the applicable approach geometry,\n            overall system response time, machine stopping time, detection\n            capability and reaching conditions. For suitable vertical ESPE\n            applications, use the current ISO 13855:2024 method and validate\n            the final installation.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          Does CCH currently sell Type 2 safety light curtains?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            CCH&#8217;s current international ENT safety light curtain range is\n            Type 4. Type 2 is covered on this page for standards education\n            and product-selection understanding, not as a current CCH\n            international product line.\n          <\/p>\n        <\/div>\n      <\/details>\n\n\n      <details class=\"t2t4-faq-item\">\n        <summary>\n          What Type are CCH ENT safety light curtains?\n        <\/summary>\n        <div class=\"t2t4-faq-answer\">\n          <p>\n            The current CCH ENT international safety light curtain range is\n            Type 4, with ENT14, ENT25 and ENT45 resolution platforms for\n            different detection requirements.\n          <\/p>\n        <\/div>\n      <\/details>\n\n    <\/div>\n\n\n    <div class=\"t2t4-final\">\n\n      <div class=\"t2t4-final-label\">\n        Current CCH Safety Light Curtain Range\n      <\/div>\n\n      <h3>\n        Need a Type 4 Safety Light Curtain for Your Machine?\n      <\/h3>\n\n      <p>\n        Explore the ENT Type 4 range or discuss your required resolution,\n        safety distance, protective height and control-system integration with\n        CCH.\n      <\/p>\n\n      <div class=\"t2t4-final-actions\">\n\n        <a href=\"\/safety-light-curtains\/\" class=\"t2t4-final-btn t2t4-final-primary\">\n          View ENT Type 4 Safety Light Curtains \u2192\n        <\/a>\n\n        <a href=\"\/safety-light-curtains\/type-4-safety-light-curtain\/safety-distance-calculator-iso-13855\/\" class=\"t2t4-final-btn t2t4-final-secondary\">\n          Safety Distance Calculator \u2192\n        <\/a>\n\n        <a href=\"\/contact-us\/\" class=\"t2t4-final-btn t2t4-final-secondary\">\n          Contact Us \u2192\n        <\/a>\n\n      <\/div>\n\n    <\/div>\n\n  <\/div>\n\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>01 \u00b7 Safety Light Curtain Guide Type 2 vs Type 4 Safety Light Curtains The main difference between a Type 2 and Type 4 safety light curtain is the level of safety performance and fault behaviour required by IEC 61496\u2014not simply resolution, sensing range or the number of processors inside the device. Type selection should [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":2732,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[29],"tags":[],"class_list":["post-2722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-safety-light-curtains-blogs"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/posts\/2722","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/comments?post=2722"}],"version-history":[{"count":0,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/posts\/2722\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/media\/2732"}],"wp:attachment":[{"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/media?parent=2722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/categories?post=2722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/industrialsafetysensor.com\/fr\/wp-json\/wp\/v2\/tags?post=2722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}