Device for measuring fluid flow

A device for measuring fluid flow in a pipe, the device comprising:

• (a) a pipe section of polygonal cross section, the pipe section configured for fluid flow there through, the pipe section comprising an even number of walls in the range 4-16, a first and second end, and a longitudinal axis, and a ratio of the width to the height of the cross-section is in the range 0.3:1 to 1:0.3;
• (b) a plurality of ultrasound transducers, each ultrasound transducer comprising an emitter and receiver, each ultrasound transducer inserted into a wall of the pipe section and generating a signal when the transducers emit ultrasound through any fluid flowing in the pipe section and/or receive the ultrasound;
• and
• (c) a signals converter for processing the signals into a fluid flow rate value,
• wherein opposing walls of the pipe section are of identical length and width,
• the plurality of ultrasound transducers comprise pairs of ultrasound transducers arranged in opposing walls and/or the same wall of the pipe section,
• the device comprises at least two pairs of ultrasound transducers,
• each pair of ultrasound transducers comprises a first and second ultrasound transducer, the first ultrasound transducer arranged to emit ultrasound through any fluid flowing in the pipe section towards the second ultrasound transducer and to receive ultrasound emitted by the second ultrasound transducer, and
• the first and second ultrasound transducers are in spaced arrangement in a direction parallel to the longitudinal axis of the pipe section.