{"id":52071,"date":"2025-10-02T06:00:54","date_gmt":"2025-10-02T04:00:54","guid":{"rendered":"https:\/\/blog-stage.wika.cloudpowered.services\/en\/?p=52071"},"modified":"2026-02-17T09:47:25","modified_gmt":"2026-02-17T08:47:25","slug":"stainless-steel-pressure-gauges-leak-testing-makes-all-the-difference","status":"publish","type":"post","link":"https:\/\/blog-stage.wika.cloudpowered.services\/en\/know-how\/stainless-steel-pressure-gauges-leak-testing-makes-all-the-difference\/","title":{"rendered":"Stainless steel pressure gauges: Leak testing makes all the difference"},"content":{"rendered":"<p><strong>An essential step in the production process of pressure gauges is the leak test of the measuring system to ensure that the process medium does not escape into the environment. There are, however, significant differences in how leak tests on stainless steel pressure gauges are implemented on the market. These differences have a direct influence on the quality of the instruments \u2013 and thus on process and user safety.\u00a0<\/strong><\/p>\n<h2>Leak testing identifies leakage in the measuring system<\/h2>\n<p>In stainless steel Bourdon tube pressure gauges, for example, the measuring system consists of the process connection, the Bourdon tube and the end piece. These components are welded together in the production process and are then subjected to a stringent leak test. Since the measuring system will later be exposed to pressure and come into contact with media, it is therefore of great important that it has a high level of leak tightness \u2013 especially with flammable, explosive or toxic media.<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:334px;\"><img decoding=\"async\" src=\"https:\/\/blog-stage.wika.cloudpowered.services\/en\/files\/2025\/09\/system-23x.50.100-ohne-loecher.3083-1.jpg\" alt=\"Measuring system of a stainless steel Bourdon tube pressure gauge\" \/><p class=\"wp-caption-text\">The measuring system of a stainless steel Bourdon tube pressure gauge consists of a process connection, Bourdon tube and end piece.<\/p><\/div>\n    \n<h2>A leakage occurring in the measuring system can have serious consequences:<\/h2>\n<ul>\n<li>Danger to personnel and environment due to leakage of (hazardous) medium<\/li>\n<li>Loss of (expensive) process medium<\/li>\n<li>High maintenance costs or even shutdown of the plant<\/li>\n<li>Damage to the environment (fugitive emissions, toxic substances)<\/li>\n<\/ul>\n<p>High leak tightness in pressure gauges therefore increases safety, guarantees smooth processes and reduces downtime. A leak test that identifies even the smallest leaks is therefore an important quality feature.<\/p>\n<h2>Leak tests at WIKA: 1,000 times tougher than required by standards<\/h2>\n<p>Helium leak testing is one of the most demanding and reliable methods for detecting leaks. WIKA therefore uses this proven method as standard in the manufacture of stainless steel pressure gauges, achieving an industry-leading leakage rate of 1 \u00b7 10<sup>-6<\/sup> mbar \u00b7 l\/s. During this test, the measuring system is pressurised at nominal pressure with helium in a previously evacuated chamber. A leak detector then scans the vacuum chamber for escaping helium. As this method is particularly demanding and precise, it is associated with high costs for the manufacturer \u2013 from the investment costs for the testing equipment to maintenance and the use of helium as an expensive tracer gas.<\/p>\n<p>Relevant standards such as the European EN 837-1, the American ASME B40,100 and the international ISO 5171 only require a leakage rate of 5 \u00b7 10<sup>-3<\/sup> mbar \u00b7 l\/s regarding leak tightness. The most common leak tests in the market \u2013 the water bath test (the so-called bubble test) and the pressure-drop test \u2013 \u201conly\u201d achieve a detectable leak rate of 10<sup>-3<\/sup> mbar \u00b7 l\/s and are usually not performed at nominal pressure. In addition, the bubble test is significantly more prone to errors, as small leaks in the water bath can easily be overlooked by the human eye. In contrast, a helium leak test is offered by most manufacturers only optionally and at an additional cost.<\/p>\n<p>With 1 \u00b7 10<sup>-6<\/sup> mbar \u00b7 l\/s at nominal pressure, the standard helium leak test at WIKA is therefore 1,000 times tougher compared to the standard requirements and common industry methods. This means that leaks can be detected that are 1,000 times smaller in relation to the volume flowing through per second. This can be crucial, especially in applications where even microscopic leaks can lead to contamination, pressure losses or safety risks.<\/p>\n<h2>Practical example illustrates the effects of different leakage rates<\/h2>\n<p>An example shows what this difference means in practice for a gas application, for example with ethylene and a process pressure of 10 bar (145 psi):<\/p>\n<table class=\"aligncenter\" style=\"height: 215px;width: 100.352%;border-style: solid;border-color: #a6a39e\" border=\"1\" width=\"100.352%\">\n<tbody>\n<tr style=\"background-color: a6a39e\">\n<td style=\"width: 170.188px;text-align: center;height: 59px\">\n<p><strong>Leakage rate<br \/>\nin mbar <\/strong>\u00b7 <strong>l\/s<\/strong><\/p>\n<\/td>\n<td style=\"width: 208.547px;text-align: center;height: 59px\">\n<p><strong>Hole diameter<\/strong><\/p>\n<\/td>\n<td style=\"width: 311.891px;text-align: center;height: 59px\">\n<p><strong>Description of gas leakage<br \/>\n(p = 10 bar)<\/strong><\/p>\n<\/td>\n<td style=\"width: 118.938px;text-align: center;height: 59px\">\n<p><strong>Gass loss<br \/>\nafter 1 year<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr style=\"height: 68px\">\n<td style=\"width: 170.188px;text-align: center;height: 68px\">\n<p>5 \u00b7 10<sup>-3<\/sup><\/p>\n<\/td>\n<td style=\"width: 208.547px;text-align: center;height: 68px\">\n<p>~ 6 \u00b5m<\/p>\n<\/td>\n<td style=\"width: 311.891px;text-align: center;height: 68px\">\n<p>1 cm<sup>3<\/sup> gas loss in 1 minute<\/p>\n<\/td>\n<td style=\"width: 118.938px;background-color: #fe9900;text-align: center;height: 68px\">\n<p>~ 497 litres<\/p>\n<\/td>\n<\/tr>\n<tr style=\"background-color: #\">\n<td style=\"width: 170.188px;text-align: center;height: 88px\">\n<p>1 \u00b7 10<sup>-6<\/sup><\/p>\n<\/td>\n<td style=\"width: 208.547px;text-align: center;height: 88px\">\n<p>~ 0,1 \u00b5m<\/p>\n<\/td>\n<td style=\"width: 311.891px;text-align: center;height: 88px\">\n<p>1 cm<sup>3<\/sup> gas loss in 3 days<\/p>\n<\/td>\n<td style=\"width: 118.938px;background-color: #fe9900;text-align: center;height: 88px\">\n<p>~ 0.1 litres<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This illustrates how important precise leak testing is for the quality and safety of stainless steel pressure gauges. WIKA uses the helium leak test as a method to offer users the greatest possible protection against leakage.<\/p>\n<p><strong>Note<\/strong><br \/>\nFurther information on <a href=\"https:\/\/www.wika.com\/en-en\/pressure_gauges.WIKA\" rel=\"external\" target=\"_blank\">pressure gauges<\/a> and other <a href=\"https:\/\/www.wika.com\/en-en\/pressure.WIKA\" rel=\"external\" target=\"_blank\">pressure measuring instruments<\/a> can be found on the WIKA website. On the website, you can also learn more about WIKA as a <a href=\"https:\/\/www.wika.com\/en-en\/company.WIKA\" rel=\"external\" target=\"_blank\">company<\/a>. If you have any questions, your <a href=\"https:\/\/www.wika.com\/en-en\/contact.WIKA\" rel=\"external\" target=\"_blank\">contact<\/a> will gladly help you.<\/p>\n<p><strong>Also read our posts<\/strong><br \/>\n<a href=\"https:\/\/blog-stage.wika.cloudpowered.services\/en\/products\/pressure-products\/stainless-steel-pressure-gauges-facelift-brings-digital-features\/\">Stainless steel pressure gauges: Facelift brings digital features<\/a><br \/>\n<a href=\"https:\/\/blog-stage.wika.cloudpowered.services\/en\/knowhow\/stainless-steel-pressure-gauge-in-safety-version-selection-help\/\">Stainless steel pressure gauge in safety version: Selection guide<\/a><br \/>\n<a href=\"https:\/\/blog-stage.wika.cloudpowered.services\/en\/knowhow\/switch-contacts-make-pressure-gauges-and-thermometers-active\/\">Switch contacts make pressure gauges and thermometers \u201cactive\u201d<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>An essential step in the production process of pressure gauges is the leak test of the measuring system to ensure that the process medium does not escape into the environment. There are, however, significant differences in how leak tests on stainless steel pressure gauges are implemented on the market. These differences have a direct influence [&hellip;]<\/p>\n","protected":false},"author":143,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[766],"tags":[313,575,721,251],"class_list":["post-52071","post","type-post","status-publish","format-standard","hentry","category-know-how","tag-manometer","tag-pressure-measurement-device","tag-process-safety","tag-standards-approvals-directive"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Leak testing of stainless steel pressure gauges - WIKA blog<\/title>\n<meta name=\"description\" content=\"The leak test on stainless steel pressure gauges from WIKA is 5,000 times tougher compared to the standard requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog-stage.wika.cloudpowered.services\/en\/know-how\/stainless-steel-pressure-gauges-leak-testing-makes-all-the-difference\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Leak testing of stainless steel pressure gauges - 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