Ultrasonic flow meters are devices used to measure the flow rate of liquids or gases in a pipeline. They operate by sending ultrasonic sound waves through the fluid and measuring the time it takes for the waves to travel between sensors. This time difference helps determine the flow velocity, which can then be converted into a flow rate. These meters are non-intrusive, meaning they do not require contact with the fluid, making them suitable for various applications, including water supply, chemical processing, and HVAC systems. Their accuracy and reliability make them a popular choice in many industries.