{"id":9870,"date":"2018-01-22T07:00:27","date_gmt":"2018-01-22T06:00:27","guid":{"rendered":"https:\/\/www.gok-blog.de\/2018\/01\/22\/how-does-a-limit-indicator-work\/"},"modified":"2024-10-31T13:10:45","modified_gmt":"2024-10-31T12:10:45","slug":"how-does-a-limit-indicator-work","status":"publish","type":"post","link":"https:\/\/www.gok-blog.de\/en\/2018\/01\/22\/how-does-a-limit-indicator-work\/","title":{"rendered":"How does a limit indicator work?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #000000;color:#000000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #000000;color:#000000\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gok-blog.de\/en\/2018\/01\/22\/how-does-a-limit-indicator-work\/#First_the_test\" >First, the test<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gok-blog.de\/en\/2018\/01\/22\/how-does-a-limit-indicator-work\/#The_limit_indicator_is_not_an_automatic_shut-off_device\" >The limit indicator is not an automatic shut-off device!<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gok-blog.de\/en\/2018\/01\/22\/how-does-a-limit-indicator-work\/#Never_completely_filled\" >Never completely filled<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gok-blog.de\/en\/2018\/01\/22\/how-does-a-limit-indicator-work\/#Further_information\" >Further information<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\">A large proportion of the owners of fuel oil systems have already seen it, some people are familiar with the name, but most people aren&#8217;t familiar with how the limit indicator works. The safety fitting protects tanks from overfilling, thus also protecting their environment. The limit indicator works according to the principle of a temperature-dependent electrical PTC resistor \u2013 also known as PTC thermistor.<!--more--><\/p>\n<p style=\"text-align: justify;\">Many are still relying on oil heating and all its benefits. Something that should never be missing from any tank is the limit indicator. It is the <strong>most important safety device<\/strong> in the system, and it prevents the tank from overfilling. It does it like this:<\/p>\n<h2><span class=\"ez-toc-section\" id=\"First_the_test\"><\/span>First, the test<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">The mineral oil retailer&#8217;s tank truck driver comes to deliver. He creates an <strong>electrical connection<\/strong> between the limit indicator and the tank truck. Before he can fill, however, he must first <a href=\"https:\/\/www.gok-blog.de\/en\/2017\/11\/20\/how-can-i-check-the-functionality-of-the-limit-indicator\/\" target=\"_blank\" rel=\"noopener noreferrer\">check the functionality of the limit indicator with its overfill prevention<\/a>. The applied voltage ensures that the PTC thermistor is heated up. If the safety device passed the test successfully, there is nothing preventing the filling process.<\/p>\n<p style=\"text-align: justify;\">As soon as <strong>fuel oil reaches the PTC resistor<\/strong>, this changes the current in the electric circuit between the limit indicator and the control unit on the tank truck. Within a very short time, this change causes the filling process to be stopped and no more fuel oil flows into the tank.<\/p>\n<div id=\"attachment_8984\" style=\"width: 766px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2017\/10\/LKW-Tank.jpg\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8984\" class=\"wp-image-8984 size-full\" src=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2017\/10\/LKW-Tank.jpg\" alt=\"Vor jeder Bef\u00fcllung des Heiz\u00f6ltanks muss der Tankwagenfahrer zun\u00e4chst den Grenzwertgeber auf Funktion pr\u00fcfen.\" width=\"756\" height=\"491\" srcset=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2017\/10\/LKW-Tank.jpg 756w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2017\/10\/LKW-Tank-300x195.jpg 300w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2017\/10\/LKW-Tank-705x458.jpg 705w\" sizes=\"(max-width: 756px) 100vw, 756px\" \/><\/a><p id=\"caption-attachment-8984\" class=\"wp-caption-text\"><strong>Before each filling of the fuel oil tank, the tank truck driver must first check the function of the limit indicator.<\/strong><br \/>\u00a9 J\u00fcrgen F\u00e4lchle \/ fotolia.com<\/p><\/div>\n<h2><span class=\"ez-toc-section\" id=\"The_limit_indicator_is_not_an_automatic_shut-off_device\"><\/span>The limit indicator is not an automatic shut-off device!<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-107x300.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-9399\" src=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-107x300.jpg\" alt=\"1508000\" width=\"59\" height=\"166\" srcset=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-107x300.jpg 107w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-368x1030.jpg 368w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-768x2148.jpg 768w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-549x1536.jpg 549w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-732x2048.jpg 732w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-536x1500.jpg 536w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog-252x705.jpg 252w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/1508000_GOK-Blog.jpg 900w\" sizes=\"(max-width: 59px) 100vw, 59px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Now, you could think that every filling process could be carried out like this, out of convenience: The tank truck driver simply waits until the contact between the fuel oil and the PTC thermistor initiates the shut-down, loosens the plug connection and drives on. But <strong>be careful<\/strong>: It is prohibited to deliberately fill up the tank until the limit indicator responds!<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">The limit indicator (<em>see image<\/em>) is a safety device and should <strong>only intervene in an emergency<\/strong>; this must not be the norm during filling. The tank truck driver must check how many litres fit into the tank before filling. In doing so, he must assume that the limit indicator will not respond.<\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Never_completely_filled\"><\/span>Never completely filled<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">For example, in the case of above-ground tanks, limit indicators are set in such a way that they respond to a <strong>maximum of 95 percent by volume during filling<\/strong>. An example: Let&#8217;s assume you have a tank with a total volume of 10,000 litres. The limit indicator is installed such that the tank cannot be filled with more than 9,500 litres, i.e. 95 percent by volume.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-204x300.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-9400\" src=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-204x300.jpg\" alt=\"2816100\" width=\"104\" height=\"153\" srcset=\"https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-204x300.jpg 204w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-701x1030.jpg 701w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-768x1129.jpg 768w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog-480x705.jpg 480w, https:\/\/www.gok-blog.de\/wp-content\/uploads\/2018\/01\/2816100_GOK-Blog.jpg 900w\" sizes=\"(max-width: 104px) 100vw, 104px\" \/><\/a>And how does the tank truck driver even know how much fits in the tank? The <strong>owner of the system<\/strong> must provide the mineral oil retailer with a way of calculating the current tank capacity in litres and thus the corresponding filling volume. The easiest way to do this is with a\u00a0<a href=\"https:\/\/www.gok.de\/tankmanagement\/inhaltsueberwachung\/geraete\/\" target=\"_blank\" rel=\"noopener noreferrer\">SmartBox<sup>\u00ae<\/sup><\/a> (image).<\/p>\n<h2><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Further_information\"><\/span>Further information<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Further information on limit indicators from GOK can be found here: <a href=\"https:\/\/gok.de\/en\/Sonde-GWG-Oventrop-RL385-1508021?search=gwg\" target=\"_blank\" rel=\"noopener noreferrer\">limit indicator type GWD<\/a> and <a href=\"https:\/\/gok.de\/en\/Grenzwertgeber-GWS-Z700mm-AG-G1-Rohrarmatur-904-1560441?search=gwg\" target=\"_blank\" rel=\"noopener noreferrer\">type GWS<\/a>. In this publication you will find all relevant information on limit indicators: <a href=\"https:\/\/gok.de\/media\/b9\/ac\/99\/1721824853\/db_grenzwertgeber_11.pdf?ts=1721824882\" target=\"_blank\" rel=\"noopener noreferrer\">Technical datasheet &#8220;limit indicator (GWG) for fuel oil consumer installations&#8221;<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many people know the name and will have heard it in connection with the fuel oil system. But you will be much less familiar with the function of the limit indicator or what it protects you from.<\/p>\n","protected":false},"author":8,"featured_media":10424,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[266,267,268],"tags":[350,306,349,332,335],"class_list":["post-9870","post","type-post","status-publish","has-post-thumbnail","hentry","category-all-about-heating-oil-installations","category-level-control-safety","category-liquid-media-tank-management","tag-heating-oil-tank","tag-limit-indicator","tag-overfill-sensor","tag-safety-equipment","tag-troel-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How does a limit indicator work? - GOK-Blog<\/title>\n<meta name=\"description\" content=\"Some owners of fuel oil systems will know it: the limit indicator. 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