{"id":3967,"date":"2021-02-03T20:26:32","date_gmt":"2021-02-03T20:26:32","guid":{"rendered":"https:\/\/www.kellertechnology.com\/?page_id=3967"},"modified":"2024-11-19T13:51:26","modified_gmt":"2024-11-19T13:51:26","slug":"vacuum-chamber-testing","status":"publish","type":"page","link":"https:\/\/www.kellertechnology.com\/precision-fabrication\/custom-vacuum-chambers\/vacuum-chamber-testing\/","title":{"rendered":"Vacuum Chamber Testing: Helium Leak Testing & RGA"},"content":{"rendered":"\t\t
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Vacuum Chamber Testing: Helium Leak Testing & Residual Gas Analysis (RGA)<\/h1>

Vacuum chambers play a crucial role in <\/span>numerous<\/span> high-tech industries, including semiconductor manufacturing, aerospace, and energy research. To ensure <\/span>optimal<\/span> performance, these chambers must <\/span>maintain<\/span> a completely sealed environment, as even minor leaks or contamination can significantly <\/span>impact<\/span> their functionality. This is where helium leak testing and residual gas analysis (RGA) come into play. Both techniques are vital for verifying the integrity of vacuum chambers, helping to ensure they meet stringent performance requirements. In this blog, <\/span>we\u2019ll<\/span> explore these essential testing methods and explain how Keller Technology Corporation <\/span>utilizes<\/span> them to deliver reliable, high-performance vacuum chambers.<\/span><\/span>\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Helium Leak Testing<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Helium leak testing is known for its high sensitivity<\/span> and <\/span>is<\/span> capable of detecting<\/span> vacuum chamber <\/span>leaks as small as 10<\/span>^(<\/span>-9) <\/span>mbar\u00b7L<\/span>\/<\/span>sec.<\/span><\/span>\u00a0<\/span><\/span><\/span> Helium, a light and inert gas, is ideal for this purpose due to its small atomic size and non-reactive properties, enabling it to penetrate tiny leaks that gases like air or nitrogen might miss<\/span>.\u00a0\u00a0<\/span><\/span> The main <\/span>objective<\/span> of helium leak testing is to <\/span>identify<\/span> any potential entry or exit points for gases, ensuring that the vacuum chamber is properly sealed. This is particularly crucial in applications such as semiconductor equipment, where the presence of unwanted gases can significantly affect product quality and operational efficiency.<\/span><\/span>\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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How Helium Leak Testing Works<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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To conduct a helium leak test on a vacuum chamber, helium is introduced to the interior or the exterior of the vacuum chamber. Then a helium mass spectrometer is used to detect the presence of the gas. There are two primary methods of conducting helium leak tests:<\/span>\u00a0<\/span><\/p>

Vacuum Method:<\/span><\/b>\u00a0<\/span><\/h4>

In this method, the vacuum chamber is evacuated, and helium is sprayed around its exterior. If any helium enters the chamber through leaks, the mass spectrometer detects it and provides precise information about the leak\u2019s location and size. This method is extremely sensitive and can detect even the smallest leaks.<\/span>\u00a0<\/span><\/p>

Sniffing Method:<\/span><\/b>\u00a0<\/span><\/h4>

The sniffing method is typically used for larger leaks or when the vacuum method is not practical. Helium is introduced inside the chamber, and a “sniffer” probe is used to detect escaping helium on the chamber\u2019s exterior.<\/span>\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Residual Gass Analysis (RGA)<\/span><\/b>\u00a0<\/span><\/h2>

What Is Residual Gas Analysis (RGA)?<\/span><\/b>\u00a0<\/span><\/h3>

While helium leak testing ensures that no external gases are entering the vacuum chamber, residual gas analysis (RGA) focuses on the detection and identification of gases already present inside the chamber. This is essential because even minute quantities of contaminants can degrade the performance of a vacuum chamber and jeopardize the processes that occur within.<\/span>\u00a0<\/span><\/p>

A residual gas analysis (RGA) typically consists of a mass spectrometer that analyzes the types and quantities of gases present inside the vacuum chamber. By measuring the molecular composition of these gases, the RGA can detect contamination or leaks within the vacuum chamber that might otherwise go unnoticed.<\/span><\/p>

How a Residual Gas Analysis Works\u00a0<\/span><\/h3>

Residual Gas Analysis<\/span> operates<\/span> by ionizing the gas molecules inside the vacuum chamber and then separating them based on their mass-to-charge ratio. The system can detect a wide range of gases, including water vapor, oxygen, nitrogen, carbon dioxide, and more harmful contaminants like hydrocarbons or solvents<\/span>.\u00a0 <\/span>This real-time analysis of gas composition <\/span>provides<\/span> critical insights into the chamber\u2019s vacuum integrity, enabling technicians to clean, adjust, or make repairs if unwanted gases are detected. RGA is particularly useful when combined with helium leak testing, as it can help <\/span>identify<\/span> contamination issues that might be unrelated to leaks, such as outgassing from materials inside the chamber.<\/span><\/span>\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Applications of Helium Leak Testing & Residual Gas Analysis<\/span><\/b>\u00a0<\/span><\/h2>

Helium leak testing and Residual Gas Analysis are indispensable in industries that require high levels of vacuum integrity, including:<\/span>\u00a0<\/span><\/p>