This article introduces the IC Card Gas Meter Charge system's operation principle including the function, the system construction frame, the hardware architecture, the software flow diagram and so on.

介绍了IC卡煤气表收费系统的工作原理，主要包括其功能、系统结构框图、原理图及其软件流程设计等。

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The article analyzes the operation principle of gas roots flow meter and gas turbine flow meter, and summarizes their differences on design selection and installation.

文章分析了气体罗茨流量计与气体涡轮流量计的工作原理，总结了两者在设计选型、安装上的不同。

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