Ultrasonic Liquid Flowmeters are designed to measure volume flow and liquid volume. Their operation principle is based on the measurement of the difference between the time which is required for ultrasonic pulses passing upstream and the time which is required for them passing downstream. The pulses are excited by piezoelectric ultrasonic transducers installed on the measured pipeline section. The piezoelectric ultrasonic transducers operate alternatively in receiver-transmitter mode and provide transmission of ultrasonic pulses to the liquid and their receipt from the liquid at an angle to the pipeline axis. The liquid movement causes the change of the time which is required to transmit the ultrasonic pulses upstream and downstream. The difference in the time of flowmeters' ultrasonic pulses passing upstream and downstream is proportional to the liquid volume flow. Liquid flowmeters' computation system performs the following functions:
digital processing of signals received from ultrasonic transducers
calculation of rate, volume flow and liquid volume, mass flow and liquid mass
allow measuring upstream and downstream in case of such option request