How does an ultrasonic flow meter work?
In principle, Ultrasonic Flow Meters make use of sound waves to measure the velocity of fluid moving through a pipe and, in turn, measure the volumetric flow of the liquid.
What are the different types of ultrasonic flow meters?
There are two types of Ultrasonic Flow Meters. One works on the Transit Time or Time of Flight principle. The second one works on the Doppler Effect principle.
The transit time meter is used for clear liquids or liquids with very low levels of undissolved solids.
When the ultrasound waves pass through the liquid, the component of liquid velocity is added to the ultrasound velocity. By careful measurement of the time required by the sound wave to reach the other end of the diameter, one can accurately calculate the liquid velocity. By knowing the velocity, the volumetric flow rate can be calculated.
The Doppler meter is suitable for liquids with a high level of undissolved solid contamination. When the sound wave gets reflected from any particle in the flow, its frequency changes, and by observing the change in frequency, the velocity of the particle can be calculated, and in turn, the volumetric flow.
What are the types of Transit type Ultrasonic Flow Meters?
There are two main variants: one is the insertion type, and the other is the ‘clamp-on type. In the case of ‘clamp-on, there is no need to cut the pipe, and the installation is very easy, especially on big pipelines, without taking a shutdown. It is possible to ‘hot tap’ the pipeline to install the insertion-type Ultrasonic flow meter, to avoid a shutdown.
Where are Ultrasonic Flow Meters used?
Ultrasonic flow meters are used in a range of fluid applications. Water and most of the other liquids are perfect for ultrasonic flowmeters. Ultrasonic Flow Meter is a non-invasive flow measurement technology.
What are the advantages of ultrasonic flow meters?
- Auto-adjustable to various pipe materials.
- Quick and easy to install and operate
- Requires no special skills or equipment.
- Budget-friendly and adaptable.
- No need to cut the pipe or stop water; easy to install.
- Highly accurate and reliable.
- There are no moving parts, no pressure drops, and no maintenance requirements.
How accurate are ultrasonic flow meters?
Electromagnetic as well as ultrasonic meters provide highly accurate flow readings for water and wastewater applications.
However, electromagnetic flowmeters offer better accuracy. Ultrasonic flow meters offer good accuracy and are easy to install and maintain. Transit-type ultrasonic flow meters can measure flow in both forward and reverse directions.