Leak Testing Academy l Methods l Tracer Gas

WHAT IS TRACER GAS LEAK TEST?

Tracer gas leak testing is a highly sensitive method for detecting leaks by using a gas, such as helium or hydrogen, to pinpoint even the smallest leak locations. The tracer gas is introduced into or around the object, and specialized detectors are used to identify the gas as it escapes. This method includes techniques like sniffing, bombing, spray and vacuum leak testing, each suited for specific applications and needs.

Tracer gas leak testing is a highly sensitive method for detecting leaks by using a gas, such as helium or hydrogen, to pinpoint even the smallest leak locations. The tracer gas is introduced into or around the object, and specialized detectors are used to identify the gas as it escapes. This method includes techniques like sniffing, bombing, spray and vacuum leak testing, each suited for specific applications and needs.

METHODS FOR TRACER GAS LEAK TESTING

SNIFFING METHOD

The sniffing method in tracer gas leak testing involves detecting leaks by using a highly sensitive probe to “sniff” for escaping tracer gas around potential leak points. This method is highly precise and allows pinpointing the exact location of leaks, making it ideal for repair or maintenance tasks.

Steps for Sniffing Method

1. Prepare the Object
2. Pressurize with Tracer Gas (helium, hydrogen…)
3. Move the Sniffing Probe around the Object
4. Detect and Locate any Leak(s)

Example of Applications

• Automotive: fuel systems, air conditioning…
• Aerospace: hydraulic systems, wings…
• HVAC: radiators, ac systems…

Benefits

BOMBING METHOD

The bombing method is used for sealed objects that cannot be directly pressurized. The object is placed in a chamber filled with tracer gas, allowing the gas to penetrate any existing leaks. It’s particularly effective for testing completely sealed or non-accessible items.

Steps for Bombing Method

1. Place the Object in a Tracer Gas Chamber
2. Expose to High Tracer Gas Pressure
3. Remove and Test for Internal Gas
4. Detect Leak(s) and Analyze Results

Example of Applications

• Medical Devices: sealed components such as catheters
• Electronics: sealed battery cells, waterproof enclosures…
• Packaging: leak-proof packaging integrity testing

Benefits

SPRAY METHOD

The spraying method involves applying tracer gas externally around suspected leak points while a detector inside the object senses for gas penetration. This method is excellent for localized testing in complex systems or structures with multiple joints.

Steps for Spray Method

1. Prepare the Object
2. Apply Tracer Gas Spray
3. Monitor for Internal Detection
4. Detect and Analyze Leak(s)

Example of Applications

• Industrial Machinery: complex assembly with joints
• HVAC Systems: ductwork, seals
• Pipelines: specific joints or welds

Benefits

VACUUM METHOD

The vacuum method uses a vacuum environment to detect leaks. The object is placed in a vacuum chamber, and tracer gas is sprayed around the exterior. A detector inside the chamber identifies gas entering through leaks. This method is highly sensitive and can detect extremely small leaks.

Steps for Vacuum Method

1. Place the Object in a Vacuum Chamber
2. Create a Vacuum Inside the Chamber
3. Spray Tracer Gas around the Object
4. Detect Leak(s) and Analyze Results

Example of Applications

• Medical Devices: sterile container, vial, pacemaker…
• Aerospace: critical fuel and air systems
• Semiconductor: vacuum systems

Benefits

HELIUM & HYDROGEN FOR YOUR LEAK TESTING APPLICATION

HELIUM LEAK TESTING

A helium leak test is one of the most precise and reliable methods for identifying and quantifying leaks in sealed systems. Helium, due to its small atomic size and inert properties, is the ideal tracer gas for detecting even the smallest leaks that other methods might miss. Whether it’s ensuring the integrity of a critical aerospace component or verifying the seal of a medical device, helium leak testing is the industry standard for high-sensitivity applications.

How Does a Helium Leak Test Work?

The helium leak test works by introducing helium gas into or around the test object and using a specialized detector to identify any escaping gas. This process is incredibly sensitive, capable of detecting leaks as small as 10⁻⁹ mbar∙l/s, ensuring unmatched accuracy in leak detection.

There are several advantages to using Helium for your application, including:

The helium leak test stands as the gold standard for industries requiring the highest levels of precision and reliability in leak detection. Its accuracy, combined with its adaptability to various testing methods, makes it an essential tool for ensuring product quality and safety.

HYDROGEN LEAK TESTING

A hydrogen leak test uses a mixture of hydrogen and nitrogen as a tracer gas to detect leaks in sealed systems. Hydrogen’s small molecular size and high diffusivity make it an excellent choice for identifying micro-leaks. Compared to helium, hydrogen testing is more cost-effective while still offering high sensitivity, making it a popular option for industries seeking reliable and affordable leak detection methods.

How Does a Hydrogen Leak Test Work?

Hydrogen leak testing involves introducing a hydrogen-nitrogen gas mixture (typically 5% hydrogen and 95% nitrogen for safety) into or around the test object. A hydrogen-specific sensor detects the escaping gas, allowing for pinpoint accuracy in identifying leaks.

There are several advantages to using Hydrogen for your application, including:

The hydrogen leak test offers an economical yet sensitive solution for detecting leaks in sealed systems. Its adaptability to various methods and applications makes it an excellent choice for industries looking to balance precision, safety, and cost-efficiency in their leak detection processes.

ATEQ TRACER GAS LEAK TEST INSTRUMENTS

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