1.Ultrasonic flow meters have many advantages over other types of flow meters. The main advantage offered is that it measures non-invasively. The flow of fluid is measured by clamping a set of sensors to the pipe. Because in most cases the sensors are placed externally, they are not in contact with the fluid. There are a variety of industrial applications that require accurate flow measurement. However, traditional methods are not always an option, so non-destructive, non-invasive techniques and methods are required. Ultrasonic flow meters are the preferred devices that cannot come into contact with the fluid being measured. Ultrasonic measurements are made by attaching two transducers to the outside of the pipe.
2.This method of installation is ideal for all situations where the pipe cannot be cut or the process cannot be shut down. These flow meters for external use do not suffer from any mechanical wear. They do not cause pressure drops and can be used for bi-directional measurements. This method is different from other meters. This is perfect when you can't close the app or cut the pipe during the installation process. Clamp-on flow meters experience no pressure drop. Flow meters are not subject to normal wear and tear. Bi-directional measurement can be done with a clamp-on flow meter.
3.Time-of-flight ultrasonic fluid measurement
Ultrasonic flow meters measure the time difference between an ultrasonic pulse upstream and an ultrasonic pulse propagating downstream. These sound waves are generated by a pair of externally attached probes. The difference between the two time intervals is a function of flow direction and velocity, which represents an accurate measure of the average velocity of the liquid flowing through the pipe. The velocity of the fluid is measured indirectly by sending ultrasonic pulses from one probe to the second and back again. In both cases the time of arrival needs to be measured. The difference between these two times is proportional to the average velocity of the liquid.
4.This is the parameter that ultrasonic flowmeters use to calculate the flow rate of liquids. These calculations also take into account some user-entered data. These piezoelectric transducers can be mounted on the outside or inside of the pipe. External mounts work well in most cases. However, in the case of uneven wall thickness or corrosion issues, the transducer must be inserted through the pipe in order to be able to do its job properly. Advances in digital signal processing have made it possible to attach digital codes to sound beam sound waves. This is a great way to get rid of many problems, such as noise and density variations.
5.Traditionally, flow meters using the transit time method have only been used in clean fluid conditions, with few air bubbles or suspended solids. However, advances in transit time technology have eased some of these flow conditions. The figure below depicts the time-of-flight technique.
