The difference between nitrogen leak detection and helium leak detection

Helium, nitrogen

1、 Detection principle

Nitrogen leak detection uses the concentration difference of nitrogen to detect leaks. Nitrogen is sprayed onto the tested area, and the location and size of nitrogen leaks are measured through the permeation and diffusion of nitrogen. Helium leak detection utilizes the very small properties of helium molecules, injecting helium as a detection gas into the detection site, and then using a detector to detect the leaked helium in order to locate the leak.

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2、 Scope of application

Due to the small size of helium molecules, helium leak detection can detect very small vulnerabilities, making it particularly suitable for high-precision detection in fields such as automotive, aerospace, and semiconductor. Nitrogen detection is more suitable for detecting larger gas leaks, such as pipelines, pressure vessels, etc., with less impact on temperature and humidity, and is relatively economical.

3、 Sensitivity

Due to the characteristics of helium molecules, helium leak detection is very sensitive and can detect very small leaks, with a minimum detection concentration typically of 1 × 10 ^ -6 ml/s. Nitrogen detection is relatively insensitive, with a minimum detection concentration of generally 1 × 10 ^ -3 ml/s.

4、 Security

High-purity helium

Helium is a very stable and safe gas that does not burn or explode, nor does it cause harm to the environment and human health. Although nitrogen is also a relatively safe gas, it can cause adverse reactions such as dizziness and nausea at high concentrations, and safety precautions should be taken.

In summary, although nitrogen leak detection and helium leak detection are both methods of leak detection, their detection principles, scope of application, sensitivity, and safety are different. Which detection method should be selected based on the actual situation and needs.

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