检测开关是体积管基准管段位置的标志 ,并以此确定其标准容积。由于体积管是一种准确度高、技术先进的流量计校准装置 ,确保体积管标准容积值的准确性和稳定性是十分重要的 ,为此目的 ,ＪＪＧ2 0 9- 94检定规程中要求体积管的检定周期为 3年 ,并且还规定在检定周期内凡对检测开 The test switch is a mark of the position of the volume pipe base pipe and determines its standard volume. Since the volumetric tube is a highly accurate and state-of-the-art flowmeter calibration device, it is important to ensure the accuracy and stability of the standard volumetric value of the volumetric tube. For this purpose, the JJG209-94 verification protocol requires volumetric tubes Of the test period of 3 years, and also provides that in the test cycle where the test on