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In automatic fire alarm, respirators , sensors and fire scene flammable, explosive , toxic, harmful gases and other fire detection equipment fast product research , development and production, often require the sf6 gas preparation of a series of standard gas substances for for product testing and calibration ; at the fire scene flammable, explosive , toxic, harmful gaseous substances rapid test , you need a certain concentration of the standard gas production standards as ruler of Israel, or the concentration of the standard ; in the cause of the fire investigation , research and application of a gaseous analytical evidence identification methods , the need to prepare a certain concentration of a test substance standard gas to experiment with different sampling efficiency of sampling instruments or different absorbent absorption efficiency and the accuracy of identification methods , the reliability . Therefore , the preparation of a certain concentration of the standard gas is fire product research , development, production and fire control work a student should link. The preparation is different from the standard gas liquid preparation of standard material , there is a certain degree of difficulty.

Standard gas is a gaseous state standard reference materials, including high-purity standard specialty gas gases and mixed standard gas , gas mainly refers to the preparation of mixed standard gases. Is a standard mixture of known concentration of one or more components of the gas mixture to another does not react with the background gas in the material. Standard gas preparation technologies include static and dynamic gas distribution technology with gas technology into two categories.