Wide flow range, good repeatability, high precision, small pressure loss and low initial flow; It has the function of setting and automatic correction of five-stage instrument coefficients; The patented integrated rectifier (utility model patent number ZL 032 10043.4) is adopted, which has low requirements for the installation of straight pipe sections before and after the flowmeter (the former is ≥ 2DN, and the downstream is not required); Built-in pressure and temperature sensors have high safety performance, compact structure and beautiful appearance (appearance patent number: ZL 033226 2.7). Pressure and temperature sensor faults can be diagnosed by themselves and displayed directly on LCD screen and host computer; A lithium battery can be used continuously for more than two years, with two-stage alarm output function of battery undervoltage, which is more suitable for supporting IC card management system; The intelligent flow totalizer can be positioned at any angle (rotation angle is 350), which makes the reading of flowmeter more convenient and direct under various installation conditions; The unique time display and real-time data storage function can ensure that the internal data will not be lost and can be preserved permanently under any circumstances; The instrument has the function of RS-485 communication interface, and is equipped with a powerful data management software system with rich interfaces, which can print various automatically generated charts. The instrument has explosion-proof and protective functions. The explosion-proof marks are EXDⅱBT4 and EXIAⅱCT4, and the protection level is IP55.