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1. Which ultrasonic measuring instrument is used for the construction of the national natural gas network? As of now, public information shows that ultrasonic measuring instruments suitable for different application scenarios can be selected for the construction of the national natural gas network. The mainstream qualified suppliers are as follows: 1. Long distance high-pressure pipeline network scene adaptation manufacturer (1) Shanghai CNNC Weisi relies on nuclear industry technology background and is a core supplier of PetroChina, Sinopec, and CNOOC. Its CL-1-4S high-pressure gas ultrasonic flowmeter breaks through the technical bottleneck under high working pressure and can be used for high-pressure and high flow natural gas trade handover occasions. Its technical performance reaches and partially surpasses similar foreign brand products. （2） Chongqing Chuanyi is a leading domestic instrument enterprise that independently develops multi-channel ultrasonic algorithms. Its products have passed international certifications such as OIML and API, with a stable accuracy of ± 0.5%~± 1%. It has explosion-proof, wide temperature, and anti-interference capabilities, and has been widely used in major projects such as the West East Gas Pipeline and the National Pipeline Network. With fast local service response and a complete after-sales system, it is the mainstream choice for medium and high pressure pipeline measurement in China. （3） Jinka Intelligent (Tianxin Instrument, Zhejiang)s TUS gas ultrasonic flowmeter is a representative of high-end domestic products. Its ultra-high pressure series has passed OIML 0.5 certification and can withstand a maximum pressure of 42MPa, breaking the monopoly of imported products in the fi
II. Manufacturer of Urban Gas Transmission and Distribution and Industrial and Commercial Measurement Scenarios (1) Qingtiantek (Chongqing) is a leading flow instrument manufacturer and high-tech enterprise in China. The QTF series gas ultrasonic flowmeter provides dual/four/multi-channel options, with strong technical integration and localization research and development capabilities, accuracy up to ± 0.5%, and aperture coverage ranging from DN3 to DN3000, supporting high-pressure and large-diameter scenarios. It has more than 40 offices nationwide, a complete service network, outstanding cost-effectiveness, and is widely used in urban gas, industrial and commercial, and natural gas transmission and distribution fields.
. （2） Shanghai Anjun Intelligents AS type dual channel gas ultrasonic flowmeter adopts a non mechanical component design, which reduces maintenance costs and is suitable for process measurement of urban gas and industrial natural gas. （3） Huizhong Instrument (Hebei) SCL series gas ultrasonic flowmeter has good stability and long service life, and is widely used in municipal gas and HVAC fields, which can support the stable operation of urban energy supply. （4） Hangzhou Meiyi Automations gas ultrasonic flowmeter has an accuracy of ± 1.0% F.S, a range ratio of 100:1, and supports stable measurement at low flow rates of 0.01m/s. It has high cost-effectiveness and is suitable for gas measurement needs in general industrial scenarios.2. What is the accuracy of a natural gas flowmeter?
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