Purity standards and detection methods for high-purity helium gas

In the application of high-purity helium gas, purity can be defined as the degree to which there are no impurities in the gas, usually expressed as one thousandth or one millionth. In order to ensure the purity and stability of high-purity helium gas in various applications, specific standards must be followed. This article will introduce the general standards for high-purity helium gas.

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1. Purity standards for high-purity helium gas

The purity of high-purity helium gas is determined by measuring the content of impurities in the gas. Generally speaking, the purity of high-purity helium can be divided into three levels: ordinary high-purity helium, high-purity helium, and ultra-high purity helium. The purity of ordinary high-purity helium gas is generally above 99%, the purity of high-purity helium gas is above 99.999%, and the purity of ultra-high purity helium gas is above 99.999%. These purity levels are related to various applications of high-purity helium gas.

2. Specifications for high-purity helium gas

In the application of high-purity helium gas, certain specifications must be followed. Here are some common norms:

2.1 Gas Cylinder

High purity helium gas is usually stored in high-pressure gas cylinders. Gas cylinders must be designed and manufactured in accordance with international standards and marked with the correct markings and labels. When using high-purity helium gas, it is necessary to ensure the safety of the gas cylinder and follow the correct operating procedures. In addition, gas cylinders must be regularly inspected and tested to ensure that they can safely store gas.

2.2 Purity

In various applications, the purity of high-purity helium gas must comply with specific specifications. For example, in electronic device manufacturing, high-purity helium gas must reach 99.999% or higher. For some more sensitive applications, such as semiconductor manufacturing, ultra-high purity and high-purity helium gas must reach 99.999% or higher. In order to ensure the purity of high-purity helium gas, the gas cylinder must be sealed to prevent impurities from entering the gas.

2.3 Storage and Transportation

When storing and transporting high-purity helium gas, certain regulations must be followed. When storing high-purity helium gas, the gas cylinder must be placed in a dry, clean, and well ventilated area, away from sources of fire and other flammable substances. When transporting high-purity helium gas, it is necessary to use specially designed transport containers and label them correctly. During transportation, it is necessary to maintain the stability of high-purity helium cylinders, follow correct operating procedures, and prevent cylinder damage or leakage.

2.4 Operating Procedures

When using high-purity helium gas, it is necessary to follow the correct operating procedures. The operating procedures must comply with various international and local regulations, including safety operation guidelines. Operators must receive training on how to correctly operate, store, and transport high-purity helium gas. When using high-purity helium gas, appropriate personal protective equipment such as gloves, goggles, and respiratory masks must be worn.

3. Detection method for high-purity helium gas

In order to ensure the purity and quality of high-purity helium gas, specific testing methods must be used. Here are some commonly used methods for detecting high-purity helium gas:

3.1 Gas Chromatography Method

Gas chromatography is a commonly used method for detecting high-purity helium gas. This method uses gas chromatography to detect impurity content in high-purity helium gas. Gas chromatography can detect many impurities in high-purity helium gas, including water, oxygen, nitrogen, argon, and carbon dioxide. This method has high accuracy and good reliability, and has become one of the main methods for detecting the purity of high-purity helium gas.

3.2 Mass spectrometry method

Mass spectrometry is a high-precision method for detecting high-purity helium gas. This method uses a mass spectrometer to detect various elements and molecules in high-purity helium gas. Mass spectrometry can detect trace elements and molecules in high-purity helium gas, including oxygen, nitrogen, argon, hydrogen, methane, ethane, acetylene, etc. This method is suitable for applications that require high purity of high-purity helium gas, such as semiconductor manufacturing.

3.3 Thermal conductivity method

Thermal conductivity method is a simple high-purity helium gas detection method. This method uses a thermal conductivity meter to measure the thermal conductivity of high-purity helium gas. The thermal conductivity is inversely proportional to the impurity content in high-purity helium gas. This method is suitable for applications with low purity requirements for high-purity helium gas, such as high-purity and laboratory applications. Various specifications

4. Conclusion

High purity helium is an important gas widely used in various fields. In order to ensure the purity and stability of high-purity helium gas in various applications, specific standards must be followed. In the application of high-purity helium gas, it is necessary to comply with regulations on gas cylinders, purity, storage and transportation, and operating procedures. In addition, in order to ensure the purity and quality of high-purity helium gas, specific detection methods such as gas chromatography, mass spectrometry, and thermal conductivity must be used.

In short, high-purity helium is a high-purity gas that is crucial for many applications. The purity and stability of high-purity helium gas can be ensured by following specific standards. By using appropriate high-purity helium storage and transportation methods, correct operating procedures, and specific testing methods, the quality and purity of high-purity helium can be ensured to meet the requirements of various applications.

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