Doppler vs Transit Time - Let's talk Ultrasonic Flow Meters

Ultrasonic flow meters are non-intrusive devices that use acoustic vibrations to measure the flow rate of the liquid. There are two types, Doppler and transit time. The Doppler and transit time flow meters operate on a similar principle, but the technology varies significantly, so it’s important to know which flow meter to use for your application.

An ultrasonic flow meter (non-intrusive Doppler flow meter) is a volumetric flow meter which requires particulates or bubbles in the flow. Ultrasonic flow meters are ideal for wastewater applications or any dirty liquid which is conductive or water based. Ultrasonic flow meters will generally not work with distilled water or drinking water. Aerations would be required in the clean liquid applications. Ultrasonic flow meters are also ideal for applications where low-pressure drop, chemical compatibility, and low maintenance are required.

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