Ultrasonic gas flowmeters are used to measure the volume flow rate and volume of gas under operating conditions, calculate the volume flow rate and volume reduction to standard conditions, calculate the flow rate, mass and heat of combustion of mass gas (including natural and associated oil).

Gas ultrasonic flowmeters are devices used to measure the flow rate of gas in a pipe using ultrasonic waves. The working principle of a gas ultrasonic flowmeter involves sending ultrasonic signals through the gas stream and measuring the time it takes for the signals to travel between two or more sensors.

The meter consists of at least two transducers that are placed on opposite sides of the pipe, and they emit high-frequency sound waves into the gas stream. The transducers alternate between emitting and receiving signals, and they measure the time it takes for the signals to travel from one transducer to the other.

When the gas flow is zero, the signals travel at a known velocity. As gas flows through the pipe, it causes a disturbance in the ultrasonic waves, which changes the time it takes for the signals to travel between the transducers. The time difference is directly proportional to the velocity of the gas flow.

The meter can also use additional transducers to measure the velocity of the gas flow at different angles and across multiple paths, allowing for more accurate and reliable flow measurements. Some ultrasonic flowmeters also use Doppler technology, which measures the frequency shift of the ultrasonic waves caused by the gas flow.