Standard calibration of gas uniformity

Categories:Industry trends
Author:
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Time of issue:2016-12-12
Views:2

(Summary description)Standard corrected gas is a gas standard substance, and the same as other solid and liquid standard materials, its uniformity is one of the most important basic characteristics. Although a variety of gases with mobility and diffusion capacity is larger, because the configuration standard calibration gas, has several components of gas filled with high pressure in the cylinder, and the molecular weight of each component of the difference, which results in the gas cylinder component distribution is uneven, some may also produce delamination phenomenon.

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Standard calibration of gas uniformity

(Summary description)Standard corrected gas is a gas standard substance, and the same as other solid and liquid standard materials, its uniformity is one of the most important basic characteristics. Although a variety of gases with mobility and diffusion capacity is larger, because the configuration standard calibration gas, has several components of gas filled with high pressure in the cylinder, and the molecular weight of each component of the difference, which results in the gas cylinder component distribution is uneven, some may also produce delamination phenomenon.

Categories:Industry trends
Author:
Origin:
Time of issue:2016-12-12
Views:2

　　Standard calibration of gas uniformity

　　Standard corrected gas is a gas standard substance, and the same as other solid and liquid standard materials, its uniformity is one of the most important basic characteristics. Although a variety of gases with mobility and diffusion capacity is larger, because the configuration standard calibration gas, has several components of gas filled with high pressure in the cylinder, and the molecular weight of each component of the difference, which results in the gas cylinder component distribution is uneven, some may also produce delamination phenomenon. In addition, there is an adsorption and desorption balance between the gas component and the inner wall of the cylinder, which adversely affects the uniformity of the components of the standard gas. Because of the above reasons, the standard correction gas still needs to be treated with a certain mixing method to solve the problem of the uniformity of gas in each cylinder. Cylinder rolling and rolling method is a quick, simple and effective method for standard correction of gas mixing. The natural diffusion method also allows the standard correction gas to be mixed evenly, but the time required to achieve a uniform state is longer.

　　Standard calibration of gas stability and validity

　　Standard corrected gas is a gas standard substance, and its stability is also an important basic feature. The stability of a standard gas consists of two aspects, namely, the standard correction of the change in gas composition with time, and the standard correction of the change in the content of the gas component with pressure. Generally speaking, the stability test of primary gas standard material needs more than one year, and the stability of standard gas of two class gas should be examined for more than half a year. According to the result of stability investigation, the effective period of standard correction gas can be determined, that is, the validity period of standard correction gas. The standard correction period of the gas can not be given at random, and it must be based on the experimental results of the stability investigation.

　　It is very important to maintain standard correction for the long-term stability of gas components. Standard calibration of the material of the gas packaging container and the treatment of the inner wall of the container are the key factors that affect the stability of the standard calibration gas

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