Study on Safety and Precision of Automatic Measuring and Filling for Liquid Gas

According to the weighing error、 inflammability and explosivity in the measuring and filling process for liquid gas,the paper introduced the special explosion-proof isolation circuit at I/O interface of the system to guarantee the safety in the measuring and filling process.The paper also discussed the principle of system realization,flow-chart and measuring method so as to increase the precision of measuring and filling operation.