{"id":11243,"date":"2025-11-05T01:09:20","date_gmt":"2025-11-05T01:09:20","guid":{"rendered":"https:\/\/daivings.lv\/?p=11243"},"modified":"2025-11-05T01:09:21","modified_gmt":"2025-11-05T01:09:21","slug":"ar-jj-ccr-rebrizeru-sasniegts-robustums-un-augsta-efektivitate-tehniskaja-nirsana","status":"publish","type":"post","link":"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/","title":{"rendered":"Robustness and high efficiency in technical diving achieved with the JJ-CCR rebreather"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/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 Contents\"><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: #999;color:#999\" 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: #999;color:#999\" 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:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#Ievads_slegta_cikla_rebrideru_CCR_Tehnologija\" >Introduction to Closed Cycle Refrigeration (CCR) Technology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#JJ-CCR_filozofija_un_mehaniska_uzbuve\" >JJ-CCR philosophy and mechanical design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#Elektroniski_kontroleta_PO_2_vadiba_ECCR\" >Electronically controlled PO_2 control (ECCR)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#Elektroniska_Redundanse_un_Drosiba\" >Electronic Redundancy and Safety<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#Tehniskas_prieksrocibas_un_pielietojums\" >Technical advantages and applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/#Par_skabekla_toksicitati_CNS_O2_CCR_konteksta\" >On oxygen toxicity (CNS O2) in the context of CCR<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ievads_slegta_cikla_rebrideru_CCR_Tehnologija\"><\/span>Introduction to Closed Cycle Refrigeration (CCR) Technology<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Closed-circuit rebreathers (CCR) have revolutionized technical diving, offering significant advantages over traditional Open Circuit Scuba. The basic principle of CCR is <strong>exhaled gas recirculation<\/strong>Unlike open-circuit systems, where exhaled gas is expelled into the water (forming bubbles), a rebreather removes carbon dioxide (CO2) with the help of a special absorbent (soda lime) and then replenishes the oxygen (O2) level, creating an optimal breathing mixture. This process allows for longer underwater time, lower gas consumption and significantly reduces decompression time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JJ-CCR_filozofija_un_mehaniska_uzbuve\"><\/span>JJ-CCR philosophy and mechanical design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>JJ-CCR<\/strong> is created with the philosophy of <strong>simple, robust and minimalist design<\/strong>, which makes it a reliable tool in difficult and cold environments, such as wrecks in the Baltic Sea, attests <strong><a href=\"https:\/\/daivings.lv\/nirsanas-instruktors-padi-msdt-valters-preimanis\/\">instructor Valters Preimanis<\/a><\/strong>The device is based on <strong>durable aluminum housing<\/strong> and <strong>stainless steel stand<\/strong>, which serves as a rigid frame for all components, including cylinder mounts (usually two small O2 and <em>diluent<\/em> This design provides good stability both on land and underwater.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most recognizable <strong><a href=\"https:\/\/daivings.lv\/tag\/jj-ccr\/\">JJ-CCR<\/a><\/strong> features are <strong>placed over the shoulder (<em>back-mounted<\/em>) counterlungs<\/strong>This position provides low breathing resistance (<em>Work of Breathing, WOB<\/em>), because the counterlungs follow the contours of the diver&#039;s shoulders, making breathing smooth and comfortable regardless of the diving position.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Elektroniski_kontroleta_PO_2_vadiba_ECCR\"><\/span>Electronically controlled PO_2 control (ECCR)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">JJ-CCR is <strong>electronically controlled closed-loop rebreather (ECCR)<\/strong>, which ensures accurate maintenance of the oxygen partial pressure ($PO_2$) in the breathing loop. The system electronics use <strong>three independent oxygen sensors<\/strong> (usually galvanic-chemical) $PO_2$ for level measurement.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Oxygen Supply:<\/strong> The main maintenance mechanism of $PO_2$ is <strong>solenoid valve<\/strong>, which is controlled by a computer. It periodically injects pure oxygen when the $PO_2$ level drops below the set value (<em>Set Point<\/em>).<\/li>\n\n\n\n<li><strong>Optimized Gas Usage:<\/strong> Unlike open-circuit diving, where $PO_2$ with a fixed nitrox mix continuously increases with depth (creating a high N2\/He load during decompression stops), a rebreather maintains an optimal $PO_2$ level at all times (e.g. <strong>1.2 \u2013 1.4 Bar\/ATA<\/strong> in depth and <strong>0.7 \u2013 0.9 Bar\/ATA<\/strong> This allows for maximum use of oxygen and minimizes the intake of inert gases (nitrogen and helium), which significantly <strong>shortens decompression time<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Elektroniska_Redundanse_un_Drosiba\"><\/span>Electronic Redundancy and Safety<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Safety is a key consideration in CCR diving, and the JJ-CCR has several safety systems built into it:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Redundant Power Supply:<\/strong> The device uses independent batteries for the main controller, <em>Head-Up Display<\/em> (HUD) and solenoid valve.<\/li>\n\n\n\n<li><strong>HUD (Head-Up Display):<\/strong> In addition to the main controller, the HUD provides a visual, colored indication of the $PO_2$ status in the diver&#039;s field of view (green = OK, yellow\/red = problem), which is critical for quick response.<\/li>\n\n\n\n<li><strong>ADV (Automatic Diluent Valve):<\/strong> The automatic diluent valve compensates for gas loss in the loop (e.g. during ascent or after manual exhalation through the mouthpiece), ensuring that the tidal volume remains adequate.<\/li>\n\n\n\n<li><strong>Manual Control:<\/strong> It should be emphasized that the JJ-CCR, like any ECCR, requires the diver to be trained <strong>to manually operate the system<\/strong>The diver should always be prepared to manually administer O2 or Diluent if the electronics fail.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tehniskas_prieksrocibas_un_pielietojums\"><\/span>Technical advantages and applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The JJ-CCR is especially popular in technical diving \u2013 wrecks, caves, and deep expeditions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Depth and Time:<\/strong> The ability to maintain optimal $PO_2$ allows for much deeper and longer dives than with open cycle without exceeding toxicity (CNS O2) limits.<\/li>\n\n\n\n<li><strong>Logistics:<\/strong> The rebreather uses only the oxygen needed for metabolism and minimal diluent gas. This significantly reduces the amount of gas required compared to open cycle, making expedition logistics easier.<\/li>\n\n\n\n<li><strong>Acoustic Silence:<\/strong> The absence of bubbles makes diving silent, which is a significant advantage for underwater photography, filming, and close contact with marine animals.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Par_skabekla_toksicitati_CNS_O2_CCR_konteksta\"><\/span>On oxygen toxicity (CNS O2) in the context of CCR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cJJ-CCR radically changes the oxygen toxicity (<em>CNS O2<\/em>) control. In open-circuit diving with a fixed nitrox mixture, the diver has no control over $PO_2$ \u2013 it continuously and passively increases with depth, thus increasing the risk of toxicity with each meter of depth. In contrast, when working with JJ-CCR, the diver inhales the gas with <strong>constant, set $PO_2$ level<\/strong> (<em>Constant $PO_2$<\/em>), which the electronics maintain regardless of depth. In practice, this means that when setting <em>Set Point<\/em> to, for example, <strong>1.3 Bar\/ATA<\/strong>, we obtain <strong>constant increase in the CNS toxicity \u201cclock\u201d<\/strong> throughout the dive, which greatly facilitates risk calculations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> However, it is this constant $PO_2$ value throughout the dive profile, especially during long decompression stages with high $PO_2$ (e.g. 1.4 Bar\/ATA), that requires the diver to follow very closely. <strong>for the cumulative CNS time limit<\/strong> and often change $PO_2$ <em>Set Point<\/em> to a lower value during decompression (e.g. to 0.9 Bar\/ATA) in order to effectively manage the total exposure time and not exceed safety standards. This is the main advantage and at the same time the liability of CCR.\u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to Closed-Circuit Rebreather (CCR) Technology Closed-Circuit Rebreathers (CCR) have revolutionized technical diving, offering significant advantages over traditional Open Circuit Scuba. The main principle of CCR is the recirculation of exhaled gas. Unlike open-circuit systems, where exhaled gas [\u2026]<\/p>","protected":false},"author":1,"featured_media":11234,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1600],"tags":[1614,1615,1616],"class_list":["post-11243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tehniska-nirsana","tag-ccr","tag-jj-ccr-2","tag-jjccr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ar JJ-CCR rebr\u012bzeru sasniegts robustums un augsta efektivit\u0101te tehniskaj\u0101 nir\u0161an\u0101 - Daivings.lv<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ar JJ-CCR rebr\u012bzeru sasniegts robustums un augsta efektivit\u0101te tehniskaj\u0101 nir\u0161an\u0101 - Daivings.lv\" \/>\n<meta property=\"og:description\" content=\"Ievads sl\u0113gt\u0101 cikla rebr\u012bderu (CCR) Tehnolo\u0123ij\u0101 Sl\u0113gt\u0101 cikla rebr\u012bderi (CCR) ir main\u012bju\u0161i tehnisko nir\u0161anu, pied\u0101v\u0101jot iev\u0113rojamas priek\u0161roc\u012bbas sal\u012bdzin\u0101jum\u0101 ar tradicion\u0101lo atv\u0113rto ciklu akvalangu (Open Circuit Scuba). 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treneris un profesion\u0101ls fotogr\u0101fs, zem\u016bdens operators. Uzs\u0101cis nir\u0113ja gaitas 2005.gada 20.oktobr\u012b, izejot apm\u0101c\u012bbu Daivinga Instruktoru Profesion\u0101l\u0101 Asoci\u0101cij\u0101, DIPA (Ang. PADI \u2013 Professional Association of Diving Instructors ), tren\u0113jies nir\u0161anas profesion\u0101l\u0101s izaugsmes apm\u0101c\u012bb\u0101 Adrijas un Jonijas j\u016br\u0101s, Zieme\u013cu Atlantijas oke\u0101na sal\u0101s, Sarkan\u0101 j\u016br\u0101, Norv\u0113\u0123u j\u016br\u0101 un Vidusj\u016br\u0101. Piedal\u012bjies zem\u016bdens arheolo\u0123isk\u0101 projekt\u0101 Latvij\u0101. 2006.gada 24.j\u016blij\u0101 izveidojis nir\u0161anas klubu \u201cDaivings.lv\u201d. Paveicis vair\u0101k k\u0101 5000 ienir\u0161anas ar zem\u016bdens elpojamo apar\u0101tu. Piedal\u012bjies daudz\u0101s nir\u0161anas eksped\u012bcij\u0101s, interes\u0113jas par ekolo\u0123iju un to k\u0101 klimata izmai\u0146as ietekm\u0113 zem\u016bdens pasauli.\",\"url\":\"https:\\\/\\\/daivings.lv\\\/en\\\/author\\\/admin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Robustness and high efficiency achieved in technical diving with the JJ-CCR rebreather - Daivings.lv","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:\/\/daivings.lv\/en\/robustness-and-high-efficiency-achieved-with-the-jj-ccr-rebreather-for-technical-diving\/","og_locale":"en_GB","og_type":"article","og_title":"Ar JJ-CCR rebr\u012bzeru sasniegts robustums un augsta efektivit\u0101te tehniskaj\u0101 nir\u0161an\u0101 - Daivings.lv","og_description":"Ievads sl\u0113gt\u0101 cikla rebr\u012bderu (CCR) Tehnolo\u0123ij\u0101 Sl\u0113gt\u0101 cikla rebr\u012bderi (CCR) ir main\u012bju\u0161i tehnisko nir\u0161anu, pied\u0101v\u0101jot iev\u0113rojamas priek\u0161roc\u012bbas sal\u012bdzin\u0101jum\u0101 ar tradicion\u0101lo atv\u0113rto ciklu akvalangu (Open Circuit Scuba). 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Began diving on October 20, 2005, undergoing training at the Professional Association of Diving Instructors, DIPA (Eng. PADI - Professional Association of Diving Instructors), trained in professional development training for diving in the Adriatic and Ionian seas, the islands of the North Atlantic Ocean, the Red Sea, the Norwegian Sea and in the Mediterranean. Participated in an underwater archaeological project in Latvia. On July 24, 2006, he founded the diving club &quot;Daivings.lv&quot;. Made more than 5000 scuba dives. Has participated in many diving expeditions, is interested in ecology and how climate change affects the underwater world.","url":"https:\/\/daivings.lv\/en\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts\/11243","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/comments?post=11243"}],"version-history":[{"count":0,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts\/11243\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/media\/11234"}],"wp:attachment":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/media?parent=11243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/categories?post=11243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/tags?post=11243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}