{"id":4521,"date":"2025-08-06T12:54:10","date_gmt":"2025-08-06T10:54:10","guid":{"rendered":"https:\/\/www.drwiesner.de\/glossary\/relative-pressure-method\/"},"modified":"2025-11-04T13:55:40","modified_gmt":"2025-11-04T12:55:40","slug":"relative-pressure-method","status":"publish","type":"glossary","link":"https:\/\/www.drwiesner.de\/en\/glossary\/relative-pressure-method\/","title":{"rendered":"Relative Pressure Method"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"4521\" class=\"elementor elementor-4521 elementor-2088\" data-elementor-post-type=\"glossary\">\n\t\t\t\t<div class=\"elementor-element elementor-element-95836d2 e-flex e-con-boxed e-con e-parent\" data-id=\"95836d2\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-54e9153 elementor-widget elementor-widget-text-editor\" data-id=\"54e9153\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The term &lsquo;relative pressure method&rsquo; (also known as absolute pressure method or <a class=\"glossaryLink\" href=\"https:\/\/www.drwiesner.de\/en\/glossary\/differential-pressure-method\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">differential pressure method<\/a>) is derived from pressure measurement relative to ambient pressure.<\/p><p>If the pressure is measured absolutely, i.e., relative to absolute vacuum, the term &lsquo;absolute pressure method&rsquo; is also used.<\/p><p>Various manufacturers use the terms &lsquo;pressure change method&rsquo; or &lsquo;differential pressure method,&rsquo; which, however, do not clearly define the applied measurement method.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b1d4fcf e-flex e-con-boxed e-con e-parent\" data-id=\"b1d4fcf\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-46e8e89 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"46e8e89\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e86a76d e-flex e-con-boxed e-con e-parent\" data-id=\"e86a76d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a989885 elementor-widget elementor-widget-text-editor\" data-id=\"a989885\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Method:<\/strong><\/p><p>The test specimen is sealed, and the test chamber, consisting of the test specimen, test fixture, connecting lines, and the test device, is pressurized or evacuated with air, or less commonly with nitrogen or other gases, and then sealed off. The pressure change caused by a leak is measured and evaluated. <\/p><p><strong>Test medium:<\/strong><\/p><p>Compressed air or nitrogen or vacuum<\/p><p><br><strong>Detectable leak rates:<\/strong><\/p><p>Volume and pressure-dependent &gt;1 cm&sup3;\/min<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2fcfb97 e-flex e-con-boxed e-con e-parent\" data-id=\"2fcfb97\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fca5bb0 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"fca5bb0\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-32389dd e-flex e-con-boxed e-con e-parent\" data-id=\"32389dd\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-142b021 elementor-widget elementor-widget-text-editor\" data-id=\"142b021\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Advantages:<\/strong><\/p><ul><li>Test devices using the relative pressure method have a simple design, making them cost-effective and robust.<\/li><li>Thanks to the test sequence defined with precise timings in the test device and the pressure monitored in all test steps, all tests are conducted under reproducible conditions.<\/li><li>The evaluation is operator-independent.<\/li><li>Test devices using the relative pressure method are usually equipped with interfaces that enable integration into an automated process.<\/li><li>The precise measurement of the pressure change allows for the quantification of the leak rate. This enables the utilization of permissible tolerances. <\/li><li>The test results can be automatically documented, provided the devices are equipped with a suitable interface.<\/li><\/ul><p><strong> <\/strong><\/p><p><strong>Disadvantages:<\/strong><\/p><ul><li>Temperature changes during the actual measurement period cause a pressure change that influences the test result.<\/li><li>For elastic test specimens, the pressure change caused by leakage can be partially compensated by the specimen&rsquo;s elasticity.<\/li><li>The measuring range of the pressure sensor in a relative pressure test device covers the entire test pressure range. This limits the resolution of the smallest pressure changes. <\/li><\/ul><p><strong> <\/strong><\/p><p><strong>Notes:<\/strong><\/p><ul><li>Test pressure changes are directly proportional to the test volume at a constant leak rate. When testing large-volume parts, leaks therefore cause only small pressure changes, the detection of which can be difficult using the relative pressure method. Therefore, efforts must be made to keep the test volume as small as possible.  <\/li><li>A test setup using the relative pressure method should be checked at regular intervals for the plausibility of the measured values, using a known part or a dummy.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"pdfprnt-buttons pdfprnt-buttons-glossary pdfprnt-bottom-right\"><a href=\"https:\/\/www.drwiesner.de\/en\/wp-json\/wp\/v2\/glossary\/4521?print=pdf\" class=\"pdfprnt-button pdfprnt-button-pdf\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/www.drwiesner.de\/wp-content\/plugins\/pdf-print\/images\/pdf.png\" alt=\"image_pdf\" title=\"View PDF\"\/><span class=\"pdfprnt-button-title pdfprnt-button-pdf-title\">Download<\/span><\/a><a href=\"https:\/\/www.drwiesner.de\/en\/wp-json\/wp\/v2\/glossary\/4521?print=print\" class=\"pdfprnt-button pdfprnt-button-print\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/www.drwiesner.de\/wp-content\/plugins\/pdf-print\/images\/print.png\" alt=\"image_print\" title=\"Print Content\"\/><span class=\"pdfprnt-button-title pdfprnt-button-print-title\">Drucken<\/span><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>The term &lsquo;relative pressure method&rsquo; (also known as absolute pressure method or differential pressure method) is derived from pressure measurement relative to ambient pressure. If the pressure is measured absolutely, i.e., relative to absolute vacuum, the term &lsquo;absolute pressure method&rsquo; is also used. Various manufacturers use the terms &lsquo;pressure change method&rsquo; or &lsquo;differential pressure method,&rsquo; [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"glossary-categories":[],"glossary-tags":[],"class_list":["post-4521","glossary","type-glossary","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Relative Pressure Method - Wiesner Pr\u00fcftechnik GmbH<\/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:\/\/www.drwiesner.de\/en\/glossary\/relative-pressure-method\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Relative Pressure Method - Wiesner Pr\u00fcftechnik GmbH\" \/>\n<meta property=\"og:description\" content=\"The term &lsquo;relative pressure method&rsquo; (also known as absolute pressure method or differential pressure method) is derived from pressure measurement relative to ambient pressure. If the pressure is measured absolutely, i.e., relative to absolute vacuum, the term &lsquo;absolute pressure method&rsquo; is also used. 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If the pressure is measured absolutely, i.e., relative to absolute vacuum, the term &lsquo;absolute pressure method&rsquo; is also used. 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