The HUALIU gas ultrasonic flowmeter is a gas flow measurement instrument based on the multi-path transit-time principle, designed and manufactured in accordance with GB/T 18604 "Measurement of natural gas flow by gas ultrasonic flowmeters" and related enterprise standards. The instrument uses transducers mounted on both sides of the pipeline to alternately transmit and receive ultrasonic signals, measuring the difference in propagation time between downstream and upstream acoustic waves to accurately calculate the gas flow velocity and flow rate. The complete instrument adopts a digital time measurement algorithm combined with wide-dynamic-range automatic gain control technology, providing stable measurement and fast dynamic response.

The product covers nominal diameters from DN50 to DN300, with a turndown ratio of up to 1:40 and an accuracy of up to Class 0.5, supporting single-, dual-, tri- and quad-path configurations. The multi-path redundant design further improves measurement reliability and accuracy under large-diameter operating conditions. With no moving parts and no throttling components, the instrument has no additional pressure loss, while also offering high pressure resistance (1.0~40MPa), a wide temperature range (medium -40~70℃), bidirectional metering and other advantages, and can operate stably at atmospheric pressure.

The instrument has built-in temperature and pressure acquisition units to achieve temperature-and-pressure-compensated conversion between operating-condition flow and standard-condition flow, supporting the AGA8-92DC and SGERG-88 compressibility factor calculation methods, and provides pulse, 4~20mA current, RS485 and other output and communication options. With intelligent self-diagnosis, data and event logging, and excellent electromagnetic compatibility, the HUALIU gas ultrasonic flowmeter is widely applicable to oil and gas field wellhead gas production, natural gas custody transfer metering, and gas detection and metering in the energy, environmental protection and other industries.