The MPCFN system is an area-flow meter that is used in combination with an optional level transmitter to measure flow in open channels. The MPCFN consists of an advanced digital signal processing (DSP) computer and up to eight speed transducers. The flow meter uses the transit time difference of ultrasonic sound pulses to measure the flow velocity in the open channel. Ultrasonic pulses are transmitted from upstream to downstream, and vice versa, through the channel at an angle α between the direction of flow and the path of the sound wave. The difference between the transit times of the sonic waves is directly proportional to the speed of the liquid.
The MPCFN can be used in rectangular, circular, trapezoidal or other shaped channels. Since the transducers generate almost no restriction, virtually no pressure drop is generated. The meter’s computer-based DSP with Cross Correlation and Fast Fourier Transform (FFT) technology allows the system to operate in the most demanding applications, including those involving liquids with high concentrations of suspended solids and air or components that generate a lot of noise. The MPCFN is also able to provide two independent measurements with a total maximum limit of 4 chord planes (example: 2 sizes each with 2 chord levels).