The TT series of ultrasonic sensors measures flow rate by calculating the spreading time of an ultrasonic wave in a liquid, going upstream and downstream into a pipe.
This flow meter is mostly used to measure the flow rate of homogeneous fluids, also with a quite high percentage of suspended solids. The measuring system is composed of a couple of ultrasonic transducers acoustically coupled to the external pipe's wall (it is also possible to use transducers in direct contact with fluid to be measured- called wetted sensors) and a HOST unit elaborating the signal that are sent and received from the transducers. The HOST unit has a DSP microprocessor, it gives signals for interfacing with the process or the control systems.
Units are available in a range of fixed or portable systems from 15 to 6000 mm pipe diameters.