{"id":8408,"date":"2026-09-12T10:00:02","date_gmt":"2026-09-12T02:00:02","guid":{"rendered":"https:\/\/www.air-tester.com\/?p=8408"},"modified":"2026-09-15T11:48:06","modified_gmt":"2026-09-15T03:48:06","slug":"qi-mi-xing-jian-ce-yi-yuan-li-ying-yong","status":"publish","type":"post","link":"https:\/\/www.air-tester.com\/en\/qi-mi-xing-jian-ce-yi-yuan-li-ying-yong.html\/","title":{"rendered":"Quick Q&A: What Does an Air Tightness Tester Do? A Detailed Explanation of Its Working Principle and Industry Applications"},"content":{"rendered":"

Q1:Airtightness Tester<\/a>What exactly do we do?<\/h2>\n\n\n\n

Turn a product\u2019s \u201cinvisible leaks\u201d into data that can be measured, analyzed, and traced.<\/strong><\/p>\n\n\n\n

Many products appear to fit together perfectly on the outside, but may harbor internal defects invisible to the naked eye\u2014such as tiny cracks, porosity in welds, improperly installed seals, and failed housing seams.Airtightness Tester<\/a><\/strong>(It is also commonly referred to in the industry asairtightness meter<\/a><\/strong>,leak detector<\/a><\/strong>,differential pressure meter<\/a><\/strong>,flow meter<\/a><\/strong>maybeMoisture Analyzer<\/a><\/strong>)<\/em>Its function is to convert these hidden defects into data that equipment can quantify and evaluate through measures such as pressure, differential pressure, and flow rate.<\/p>\n\n\n\n

Different industries have their own terms for this type of equipment: in the consumer electronics and home appliance sectors, it is commonly referred to asWaterproof Tester<\/a><\/strong>maybeWaterproof testing equipment<\/a><\/strong>...used to verify waterproof ratings such as IP67, IP68, and IP69; more commonly used in the medical device, automotive, and packaging industriesSealing Tester<\/a><\/strong>; whereas in industrial applications such as new energy batteries, water pumps, and valves,leak detector<\/a><\/strong>,Leak Detector<\/a><\/strong>maybeleak detector<\/a><\/strong>...is the more common term. Regardless of how the name may change\u2014Air tightness tester<\/a><\/strong>,Air tightness testing equipment<\/a><\/strong>,Sealing Tester<\/a><\/strong>OrLeak Detection Equipment<\/a><\/strong>\u2014The underlying logic has always been the same:Identify Leaks with Data, Safeguard Quality with Precision<\/strong>The<\/p>\n\n\n\n

Q2: Why do products need to undergo airtightness testing?<\/h2>\n\n\n\n

Because \"working\" does not mean \"working reliably over the long term.\"<\/strong><\/p>\n\n\n\n

Different industries express their concerns in different ways, but they all point to the same thing:<\/p>\n\n\n\n

sector<\/th>Key Concerns<\/th><\/tr><\/thead>
Cell Phones, Smart Wearables<\/td>Water and Dust Resistance<\/td><\/tr>
New Energy Battery<\/td>Housing Sealing and Long-Term Reliability<\/td><\/tr>
Auto Parts<\/td>Does the sealing performance meet the operating conditions?<\/td><\/tr>
Medical Equipment<\/td>Seal Consistency and Batch Stability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

All of these needs point to the same issue:Does the product's sealing performance actually meet the requirements?<\/strong><\/p>\n\n\n\n

Q3: How does a leak tester determine whether there is a leak?<\/h2>\n\n\n\n

Apply pressure to the product and observe changes in pressure or flow rate.<\/strong><\/p>\n\n\n\n

\"Principle
Animation of the Principle of Leak Testing Using the Direct Pressure Method<\/em><\/figcaption><\/figure>\n\n\n\n

Taking the most common direct-pressure method as an example, the process is as follows:Inflate \u2192 Balance \u2192 Check \u2192 Evaluate<\/strong>TheWhen there are no leaks in the product, the pressure changes very little during the pressure-holding phase.<\/strong>.;When a leak occurs, the pressure drops according to a certain pattern.<\/strong>. The device detects this change, compares it to a preset threshold, and ultimately outputs PASS \/ NG<\/strong> Results.<\/p>\n\n\n\n

Q4: What are the different methods for leak testing, and how do you choose among them?<\/h2>\n\n\n\n
\"\u5feb\u95ee\u5feb\u7b54\uff1a\u6c14\u5bc6\u6027\u68c0\u6d4b\u4eea\u662f\u505a\u4ec0\u4e48\u7684\uff1f\u5de5\u4f5c\u539f\u7406\u4e0e\u884c\u4e1a\u5e94\u7528\u573a\u666f\u8be6\u89e3\u63d2\u56fe1\"
Guide to Selecting Leak Testing Methods<\/em><\/figcaption><\/figure>\n\n\n\n

Each of the four mainstream principles has its own applicable scenarios, as shown in the figure above.differential pressure<\/strong>Due to its strong resistance to interference and high repeatability, it is most widely used in automotive components and new energy structural parts\u2014Jingcheng Engineering\u2019s\u00a0JC-C10005<\/a> range<\/strong>This is a representative product of this technological approach. The differential pressure method focuses on \"Pressure difference between the two sides<\/strong>\", the Traffic Law focuses on \"How much air has leaked out?<\/strong>\", and the two address sealing issues in different dimensions.<\/p>\n\n\n\n

Q5:Airtightness Tester<\/a>cap (a poem)Water tightness tester<\/a>Is it the same thing?<\/h2>\n\n\n\n

Not entirely, but the two can complement each other.<\/strong><\/p>\n\n\n\n

Airtightness Tester<\/a>Use compressed air to detect leaks based on pressure, differential pressure, flow rate, and other factors;Watertightness Testing Equipment<\/a>Waterproofing is then verified through methods such as water pressure testing, immersion, and spray testing. In actual production, these two methods are often used in combination\u2014First, useairtightness meter<\/a>Conduct 100% inspection during mass production to screen out the vast majority of defective units, and then perform sampling-based waterproof testing in accordance with product protection rating standards.<\/strong>The<\/p>\n\n\n\n

Q6:Airtightness Tester<\/a>Is it only suitable for products that \u201chave an interface\u201d?<\/h2>\n\n\n\n

No.<\/strong><\/p>\n\n\n\n

There are test interfaces<\/strong>The products useDirect-Pressure or Differential-Pressure<\/strong>Inspection: For a fully sealed structure with no inflation ports, the following method can be used:Volume-based dosing and other approaches<\/strong>The<\/p>\n\n\n\n