DetailsThe flowmeter operates by transmitting an ultrasonic sound from its transducer, the sound will be reflected by useful sonic reflectors suspended within the liquid and recorded by the receiving transducer. if the sonic reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler frequency) from the transmitted frequency. The shift in frequency will be directly related to the speed of the moving particle or bubble. This shift is interpreted by the instrument and converted to various user defined measuring units.
There must be some particles enough to cause longitudinal reflection - particles larger than 100 micron.
When install the transducers, the installation location must have enough straight pipe length upstream and downstream. Commonly, the upstream needs 5D straight pipe length, where D is pipe diameter.