Abstract:With the continuous development of ultrasonic metering technology, the application of ultrasonic gas meters in the industry has gradually expanded. This article takes Liaoning SC Technology Co., Ltd. as an example, and focuses on how the ultrasonic gas meters respond to the test provisions proposed by the Netherlands NMi during the MID certification process. The improvements that need to be made express the test requirements and test results of accuracy test, immunity to contaminants in gas stream, installation influence, etc., and all test results meet the requirements of MID. Finally, the whole MID test process is summarized.