1. General rules for standard gas preparation

The development process of standard gas can be divided into four steps: purity analysis of raw material gas; composition pressure preparation by weighing method; calibration by high-precision analysis methods such as gas chromatography and chemiluminescence; performance inspection and packaging conditions.

2. Purity analysis of raw gas

The standard gas has very high requirements for the accuracy of the provided characteristic values. The quality of the raw gas should be controlled before preparation. There are three problems to be solved in the analysis of raw gas: the content of the main body, the content of the components to be formulated in the dilution gas, and the content of the components that interfere with the components to be formulated. This requirement is quite harsh, which will inevitably lead to research on gas analysis technology and purification technology.

When the raw material gas required for preparation cannot meet the production requirements of the standard gas, it should be repurified to ensure the effectiveness of the above preparation process and operation process.