{"id":6010,"date":"2024-12-13T16:00:46","date_gmt":"2024-12-13T08:00:46","guid":{"rendered":"https:\/\/www.air-tester.com\/?p=6010"},"modified":"2025-08-01T16:03:03","modified_gmt":"2025-08-01T08:03:03","slug":"qi-mi-xing-jian-ce-yi-ng-jian","status":"publish","type":"post","link":"https:\/\/www.air-tester.com\/en\/qi-mi-xing-jian-ce-yi-ng-jian.html\/","title":{"rendered":"Airtightness tester NG parts test qualified? Reveal the influence of temperature on the test"},"content":{"rendered":"<p>In industrial production.<strong>Air tightness test is like a \"rigorous physical examination\" of the product to distinguish between OK and NG products.<\/strong>&nbsp;Every non-conforming (NG) product can mean huge economic losses and potential safety hazards.<\/p>\n\n\n\n<p>Today, let's take a look at why some seemingly failed products may end up passing the airtightness test.<\/p>\n\n\n\n<h2 class=\"wp-block-heading cheese-cake\" style=\"margin-top:var(--wp--preset--spacing--70)\">I. Ambient temperature: the \"invisible mastermind\" affecting test results<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:0\">1. The basic principle of airtightness testing<\/h3>\n\n\n\n<p>To figure this out, we have to understand a basic principle. In physics, there is a formula called the 'ideal gas equation of state':<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>PV = nRT<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>To put it bluntly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>P is pressure.<\/li>\n\n\n\n<li>V is the volume (test volume)<\/li>\n\n\n\n<li>n \u662f\u6c14\u4f53\u7684\u91cf &#8212; R \u662f\u7406\u60f3\u6c14\u4f53\u5e38\u6570\uff088.314 J\/(mol\u00b7K)\uff09<\/li>\n\n\n\n<li>T is the temperature<\/li>\n<\/ul>\n\n\n\n<p><strong>This formula tells us that temperature changes directly affect the test results.<\/strong>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">2. How temperature changes can \"mess things up\"<\/h3>\n\n\n\n<p>Imagine that.<a href=\"http:\/\/www.air-tester.com\/en\/\" data-type=\"link\" data-id=\"www.air-tester.com\" target=\"_blank\" rel=\"noreferrer noopener\">Airtightness testing equipment<\/a>It's like a sophisticated \"detective\" that checks for tiny air leaks in the product. However, this \"detective\" may be \"confused\" by the ambient temperature, resulting in a biased judgment.<strong>The study found that small changes in temperature could make test results 'unreliable'.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">3. Real-life case sharing<\/h3>\n\n\n\n<p>Recently, an engineer who is a fan of Precision Engineering's airtightness encountered an interesting situation:<em>When using a well-known brand of instrument for airtightness testing, the product that was originally judged to be unqualified (NG) surprisingly passed the test in the end, and the airtightness test showed a pass.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"725\" height=\"630\" src=\"https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/shi-yong-ateq-yi-qi-gong.jpg\"  class=\"wp-image-6012\" srcset=\"https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/shi-yong-ateq-yi-qi-gong.jpg 725w, https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/shi-yong-ateq-yi-qi-gong-14x12.jpg 14w, https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/shi-yong-ateq-yi-qi-gong-600x521.jpg 600w\" sizes=\"(max-width: 725px) 100vw, 725px\" title=\"\u6c14\u5bc6\u6027\u68c0\u6d4b\u4eeaNG\u4ef6\u6d4b\u8bd5\u5408\u683c\uff1f\u63ed\u79d8\u6e29\u5ea6\u5bf9\u68c0\u6d4b\u7684\u5f71\u54cd\u63d2\u56fe\" alt=\"\u6c14\u5bc6\u6027\u68c0\u6d4b\u4eeaNG\u4ef6\u6d4b\u8bd5\u5408\u683c\uff1f\u63ed\u79d8\u6e29\u5ea6\u5bf9\u68c0\u6d4b\u7684\u5f71\u54cd\u63d2\u56fe\" \/><figcaption class=\"wp-element-caption\"><em>Conversation between fans and Precision Engineering airtightness, low temperatures cause NG pieces to pass airtightness test<\/em><\/figcaption><\/figure>\n\n\n\n<p>After repeated troubleshooting, they found that the culprit of the problem was most likely the drop in ambient temperature and the low temperature of the workpiece. Our advice to him was:<strong>Airtightness testing operations try to use in a constant temperature workshop, most brands of current<a href=\"http:\/\/www.air-tester.com\/en\/\" data-type=\"link\" data-id=\"www.air-tester.com\" target=\"_blank\" rel=\"noreferrer noopener\">Airtightness Tester<\/a>All have this flaw.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading cheese-cake\" style=\"margin-top:var(--wp--preset--spacing--70)\">II. Deeper causes of miscarriage of justice due to temperature changes<\/h2>\n\n\n\n<p>We've already learned the basics of the relationship between temperature and airtightness testing. Now, let's take a closer look at how temperature variations can affect test results and how to effectively circumvent these misjudgments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">1. Importance of constant temperature of workpieces<\/h3>\n\n\n\n<p>The temperature of the workpiece is a key factor affecting the accuracy of gas tightness testing. The state of motion of gas molecules changes significantly at different temperatures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The higher the temperature, the more violent the movement of gas molecules and the greater the distance between molecules<\/li>\n\n\n\n<li>The lower the temperature, the slower the motion of the gas molecules and the smaller the distance between the molecules<\/li>\n<\/ul>\n\n\n\n<p><strong>This means that the pressure and leakage characteristics of the same volume of gas can change under different temperature conditions.<\/strong>&nbsp;Therefore, it is critical to keep the workpiece in a stable temperature environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">2. Criticality of ambient temperature control<\/h3>\n\n\n\n<p>Fluctuations in ambient temperature can directly affect the reliability of test results. The ideal environment for airtightness testing should have the following characteristics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Constant temperature within \u00b11\u00b0C fluctuation range<\/li>\n\n\n\n<li>Selection of an enclosed, temperature-controlled testing environment<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">3. Hidden hazards of airflow fluctuations<\/h3>\n\n\n\n<p>Seemingly insignificant changes in airflow may actually seriously interfere with airtightness testing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature gradient near air conditioning vents<\/li>\n\n\n\n<li>Vortexing of airflow from internal shop fans blowing directly into the inspection area<\/li>\n<\/ul>\n\n\n\n<p>All of these factors may<strong>This leads to unstable and unreliable test data, which deviates greatly from the actual leakage data, resulting in the misjudgment phenomenon of passing the airtightness test of NG parts.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading cheese-cake\" style=\"margin-top:var(--wp--preset--spacing--70)\">III. Precise control: an effective strategy to eliminate temperature misjudgment<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:0\">1. Selection of high-end testing equipment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>With real-time temperature monitoring function<\/li>\n\n\n\n<li>Automatic temperature compensation<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"666\" src=\"https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/wen-du-bu-chang-shu-ju-bi-dui.jpg\"  class=\"wp-image-6013\" srcset=\"https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/wen-du-bu-chang-shu-ju-bi-dui.jpg 1000w, https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/wen-du-bu-chang-shu-ju-bi-dui-18x12.jpg 18w, https:\/\/www.air-tester.com\/wp-content\/uploads\/2024\/12\/wen-du-bu-chang-shu-ju-bi-dui-600x400.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" title=\"\u6c14\u5bc6\u6027\u68c0\u6d4b\u4eeaNG\u4ef6\u6d4b\u8bd5\u5408\u683c\uff1f\u63ed\u79d8\u6e29\u5ea6\u5bf9\u68c0\u6d4b\u7684\u5f71\u54cd\u63d2\u56fe1\" alt=\"\u6c14\u5bc6\u6027\u68c0\u6d4b\u4eeaNG\u4ef6\u6d4b\u8bd5\u5408\u683c\uff1f\u63ed\u79d8\u6e29\u5ea6\u5bf9\u68c0\u6d4b\u7684\u5f71\u54cd\u63d2\u56fe1\" \/><figcaption class=\"wp-element-caption\"><em>Precision Engineering's<a href=\"http:\/\/www.air-tester.com\/en\/\" data-type=\"link\" data-id=\"www.air-tester.com\" target=\"_blank\" rel=\"noreferrer noopener\">Air tightness testing equipment<\/a>Temperature compensation function<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">2. Establishment of a standardized testing process<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Establishment of strict ambient temperature control standards<\/li>\n\n\n\n<li>Setting a fixed workpiece preheating\/precooling time<\/li>\n\n\n\n<li>Equipped with specialized temperature monitoring and control equipment<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"margin-top:var(--wp--preset--spacing--70)\">3. Periodic calibration and maintenance<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Quarterly calibration of instrument accuracy<\/li>\n\n\n\n<li>Record and analyze the effect of temperature changes on test results<\/li>\n\n\n\n<li>Timely updating of testing standards and parameters<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading cheese-cake\" style=\"margin-top:var(--wp--preset--spacing--70)\">IV. Practice Case: Precision Engineering's Temperature Compensation Solution<\/h2>\n\n\n\n<p><strong>JC Series<a href=\"http:\/\/www.air-tester.com\/en\/\" data-type=\"link\" data-id=\"www.air-tester.com\" target=\"_blank\" rel=\"noreferrer noopener\">airtightness tester<\/a>It not only provides advanced temperature compensation technology, but also offers tailor-made solutions for the specific needs of different industries:<\/strong><\/p>\n\n\n\n<iframe src=\"\/\/player.bilibili.com\/player.html?isOutside=true&#038;aid=113394921248919&#038;bvid=BV1WcSqYrE25&#038;cid=26531136672&#038;p=1&#038;autoplay=0\" scrolling=\"no\" border=\"0\" frameborder=\"no\" framespacing=\"0\" allowfullscreen=\"true\" style=\"width:100%;aspect-ratio:16\/9;\"> <\/iframe>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automotive Parts Seal Inspection<\/li>\n\n\n\n<li>Electronic component air tightness test<\/li>\n\n\n\n<li>Medical Device Seal Evaluation<\/li>\n\n\n\n<li>Aerospace component inspection<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading cheese-cake\" style=\"margin-top:var(--wp--preset--spacing--70)\">V. Summary<\/h2>\n\n\n\n<p>Temperature may seem insignificant, but in hermeticity testing it can make the difference between life and death for a product. By deeply understanding the mechanism of temperature influence, adopting advanced compensation technology, and performing airtightness operations in a constant temperature and humidity environment, we can dramatically improve the accuracy and reliability of testing.<\/p>\n\n\n\n<p><strong>Precision Engineering will continue to commit to the innovation of airtightness testing technology to provide customers with more accurate and reliable solutions.<\/strong>&nbsp;Let us together, with the wisdom of science and technology, for product quality protection.<\/p>","protected":false},"excerpt":{"rendered":"<p>This article discusses the influence of ambient temperature on the airtightness test results, revealing that temperature changes may lead to the misclassification of unqualified products as qualified. The article emphasizes the importance of temperature control and proposes strategies such as adopting high-end testing equipment, establishing a standardized testing process and regular calibration and maintenance to improve the accuracy and reliability of airtightness testing.<\/p>","protected":false},"author":1,"featured_media":6013,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[236],"tags":[522,39,185],"class_list":["post-6010","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-companynews","tag-gong-ye-zhi-zao","tag-39","tag-185"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/posts\/6010","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/comments?post=6010"}],"version-history":[{"count":0,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/posts\/6010\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/media\/6013"}],"wp:attachment":[{"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/media?parent=6010"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/categories?post=6010"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.air-tester.com\/en\/wp-json\/wp\/v2\/tags?post=6010"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}