节流装置在工业生产流量测量中占据主要的地位,但传统节流装置量程比较窄,一般为3∶1,在石化、石油、化工、冶金等行业的通用气体(如氧气、氮气、空气等)流量计量中限制了其应用。目前流量测量主要采用的还是标准节流装置这一传统的测量手段,但是常规的孔板流量计在流量测量方面还有很多不足,主要体现在测量范围小、压损大,现场安装、维护复杂、检定周期短等方面。尤其是测量范围小的缺点,在流量变化大的情况下计量误差 The throttling device occupies the main position in the measurement of industrial production flow, but the traditional throttling device has a relatively narrow measuring range, usually 3: 1. Common gases (such as oxygen, nitrogen, air, etc.) in petrochemical, petroleum, chemical and metallurgical industries Flow metering limits its use. The current flow measurement is mainly used by the traditional throttling device of the traditional means of measurement, but the conventional orifice flowmeter in the flow measurement there are many deficiencies, mainly in the measurement range, pressure loss, on-site installation and maintenance complex , Short test period and so on. In particular, the shortcomings of small measuring range, in the case of large changes in flow measurement error