{"id":6834,"date":"2025-06-13T13:56:39","date_gmt":"2025-06-13T11:56:39","guid":{"rendered":"https:\/\/bieler-lang.de\/?post_type=product&p=6834"},"modified":"2026-04-28T11:57:34","modified_gmt":"2026-04-28T09:57:34","slug":"gmc-8420","status":"publish","type":"product","link":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/","title":{"rendered":"GMC 8420"},"content":{"rendered":"

The GMC 8420<\/strong> evaluation unit is a convenient evaluation system for wall mounting.<\/p>\n

The GMC 8420 gas measuring computer in conjunction with sensors with 4-20 mA signal output has the following functions:
\n\u25cf Measurement and display of the gas concentration.
\n\u25cf Monitoring and warning of these gases.
\n\u25cf Triggering of protective measures to counteract an increase in the concentration
\n.<\/p>\n

The GMC 8420<\/strong> can be used directly for alerting with its internal signaling device, or it can also control external signaling devices.<\/p>\n

Up to 4 measuring points<\/strong> can be connected. All our 4 – 20 mA sensors are suitable for this.<\/p>\n

The RK 8420<\/strong> was developed for additional functionality. It has four freely programmable relay outputs for alarm 1, 2 and horn.<\/p>\n

The GMC 8420<\/strong> was developed for connecting sensors in EX zone 2.<\/p>\n

 <\/p>\n

Core features of the GMC8420:<\/h6>\n
    \n
  • Up to 4 gas sensors<\/li>\n
  • 4 to 20 mA<\/li>\n
  • Concentration display<\/li>\n
  • 2 alarm levels and additional horn output<\/li>\n
  • Checking the alarm output without test gas.<\/li>\n
  • Fault monitoring at:
    \n– Power failure
    \n– Computer fault
    \n– Wire break \/ short circuit in the sensor lines<\/li>\n
  • Potential-free relay outputs for:
    \n– 3 freely programmable relays for alarm 1, alarm 2, horn
    \n– 1 fault alarm relay<\/li>\n<\/ul>\n

     <\/p>\n

    Available accessories:<\/h6>\n
      \n
    • Output extension RK 8420<\/strong> – for 4 freely programmable relay outputs, e.g. for alarm 1, 2 and horn.<\/li>\n
    • Various gas sensors – our Ex detectors<\/li>\n
    • Central emergency power supply<\/li>\n
    • Connection cable for programming (USB)<\/li>\n
    • Horns<\/li>\n
    • Warning lights<\/li>\n
    • Solenoid valves<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

      The GMC 8420<\/strong> evaluation unit is a convenient evaluation system for wall mounting, which can be operated without additional internal wiring.<\/p>\n

      The GMC 8420<\/strong> can be used directly for alerting with its internal signaling device, or it can also control external signaling devices.<\/p>\n

      Up to 4 measuring points can be connected. All our 4 – 20 mA sensors are suitable for this.<\/p>\n

      The RK 8420<\/strong> was developed for additional functionality. It has four freely programmable relay outputs for alarm 1, 2 and horn.<\/p>\n

      The GMC 8420<\/strong> was developed for connecting sensors in EX zone 2.<\/p>\n

      Special features:<\/h6>\n
        \n
      • EX zone 2<\/li>\n
      • Quick wall mounting<\/li>\n
      • Concentration display<\/li>\n
      • Alarm via built-in signal transmitter<\/li>\n
      • Simple operation<\/li>\n<\/ul>\n
        Our quality standards:<\/h6>\n
          \n
        • Solid and proven device design<\/li>\n
        • Very durable with low maintenance costs<\/li>\n
        • Developed and manufactured in Germany<\/li>\n<\/ul>\n

           <\/p>\n

           <\/p>\n","protected":false},"featured_media":1511,"template":"","meta":{"inline_featured_image":false},"product_brand":[],"product_cat":[107,152,114,101,111,108,109,219,153,220,222,221,110,120],"product_tag":[226],"class_list":{"0":"post-6834","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-biogas-en","7":"product_cat-boiler-room-heating-en","8":"product_cat-controller-for-gas-detectors","9":"product_cat-ex-zone-2-en","10":"product_cat-hazardous-goods-storage","11":"product_cat-hydrogen-economy-h2-en","12":"product_cat-laboratories-en","13":"product_cat-lpg-lng-cng-en","14":"product_cat-not-ex-areas-safe-area-en","15":"product_cat-paintwork-colours-en","16":"product_cat-petrol-stations-en","17":"product_cat-refrigerant-monitoring-en","18":"product_cat-sewage-treatment-plant-en","19":"product_cat-tunnels-en","20":"product_tag-4-messkanaele-en","22":"first","23":"instock","24":"shipping-taxable","25":"product-type-simple"},"yoast_head":"\nGas Alarm Panel | GMC-8420 Controller<\/title>\n<meta name=\"description\" content=\"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GMC 8420\" \/>\n<meta property=\"og:description\" content=\"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/\" \/>\n<meta property=\"og:site_name\" content=\"Bieler+Lang\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/profile.php?id=61560570132188\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-28T09:57:34+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bieler-lang.de\/blcontent\/uploads\/2020\/09\/BL_GMC-8420_01.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/\",\"url\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/\",\"name\":\"Gas Alarm Panel | GMC-8420 Controller\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/bieler-lang.de\\\/blcontent\\\/uploads\\\/2020\\\/09\\\/BL_GMC-8420_01.jpg\",\"datePublished\":\"2025-06-13T11:56:39+00:00\",\"dateModified\":\"2026-04-28T09:57:34+00:00\",\"description\":\"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/#primaryimage\",\"url\":\"https:\\\/\\\/bieler-lang.de\\\/blcontent\\\/uploads\\\/2020\\\/09\\\/BL_GMC-8420_01.jpg\",\"contentUrl\":\"https:\\\/\\\/bieler-lang.de\\\/blcontent\\\/uploads\\\/2020\\\/09\\\/BL_GMC-8420_01.jpg\",\"width\":1200,\"height\":1080,\"caption\":\"Bieler+Lang_GMC_8420_Auswerteger\u00e4t f\u00fcr Gaswarnalagen_4_Messf\u00fchler_4-20mA_Bereich\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/product\\\/gmc-8420\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/bieler-lang.de\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"GMC 8420\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/bieler-lang.de\\\/#website\",\"url\":\"https:\\\/\\\/bieler-lang.de\\\/\",\"name\":\"Bieler+Lang\",\"description\":\"Eine weitere WordPress-Website\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/bieler-lang.de\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Gas Alarm Panel | GMC-8420 Controller","description":"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/","og_locale":"en_US","og_type":"article","og_title":"GMC 8420","og_description":"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.","og_url":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/","og_site_name":"Bieler+Lang","article_publisher":"https:\/\/www.facebook.com\/profile.php?id=61560570132188","article_modified_time":"2026-04-28T09:57:34+00:00","og_image":[{"width":1200,"height":1080,"url":"https:\/\/bieler-lang.de\/blcontent\/uploads\/2020\/09\/BL_GMC-8420_01.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/","url":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/","name":"Gas Alarm Panel | GMC-8420 Controller","isPartOf":{"@id":"https:\/\/bieler-lang.de\/#website"},"primaryImageOfPage":{"@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/#primaryimage"},"image":{"@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/#primaryimage"},"thumbnailUrl":"https:\/\/bieler-lang.de\/blcontent\/uploads\/2020\/09\/BL_GMC-8420_01.jpg","datePublished":"2025-06-13T11:56:39+00:00","dateModified":"2026-04-28T09:57:34+00:00","description":"Gas alarm panel GMC-8420 with integrated warning system. Visual and audible alarms for immediate hazard notification. Ensure safety with expert systems.","breadcrumb":{"@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/#primaryimage","url":"https:\/\/bieler-lang.de\/blcontent\/uploads\/2020\/09\/BL_GMC-8420_01.jpg","contentUrl":"https:\/\/bieler-lang.de\/blcontent\/uploads\/2020\/09\/BL_GMC-8420_01.jpg","width":1200,"height":1080,"caption":"Bieler+Lang_GMC_8420_Auswerteger\u00e4t f\u00fcr Gaswarnalagen_4_Messf\u00fchler_4-20mA_Bereich"},{"@type":"BreadcrumbList","@id":"https:\/\/bieler-lang.de\/en\/product\/gmc-8420\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/bieler-lang.de\/en\/"},{"@type":"ListItem","position":2,"name":"GMC 8420"}]},{"@type":"WebSite","@id":"https:\/\/bieler-lang.de\/#website","url":"https:\/\/bieler-lang.de\/","name":"Bieler+Lang","description":"Eine weitere WordPress-Website","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/bieler-lang.de\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/product\/6834","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/media\/1511"}],"wp:attachment":[{"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/media?parent=6834"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/product_brand?post=6834"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/product_cat?post=6834"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/bieler-lang.de\/en\/wp-json\/wp\/v2\/product_tag?post=6834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}