负压法音速喷嘴气体流量标准装置在国内外普遍用于检测气体流量计。该装置通过配套多个操作台位,组合采用多个音速喷嘴作为标准表的方式实现宽量程流量检测范围。考虑了温度、压力等影响因素,提高了检测的准确度。同时采用先进真空发生设备以保证特小流量检测的准确性。实验表明,该标准装置能满足各 Negative pressure Sonic nozzle gas flow standard device commonly used in home and abroad to detect gas flow meter. The device through a number of operating stations, combined with a number of sonic nozzle as a standard way to achieve a wide range of flow detection range. Taking into account the temperature, pressure and other influencing factors, improve the accuracy of detection. At the same time the use of advanced vacuum equipment to ensure the detection of very small flow rate accuracy. Experiments show that the standard device can meet each