Velocity Flowmeters generally tend to follow a linear relationship with respect to the volume flow rate. Unlike differential pressure type flowmeters, there is no square-foot relationship in these instruments. Hence, their rangeability is much better as compared to other flowmeters. Furthermore, they prove to be less sensitive to changes in viscosity when used at Reynolds numbers (Re) more than 10,000. Nearly all velocity-type flowmeter housings are outfitted with flanges or fittings. This arrangement enables them to be joined directly into pipelines. Major types of Velocity flowmeters include turbine, vortex, electromagnetic and ultrasonic.