Ultrasonic Flowmeter - Transit Time Technology, Dual Transceiver Sensors For Enhanced Flow Measurement

Ultrasonic flowmeters were first introduced for industrial use in 1963 by Tokyo Keiki (which later became Tokimec) in Japan. Tokimec is located in Tokyo, Japan. In 1972, Controltron (Hauppauge, New York) became the first U.S. manufacturer to market ultrasonic flowmeters in the United States. In the late 1970s and early 1980s, both Panametrics (Waltham, Massachusetts) and Ultraflux (Poissy Cedex, France) experimented with the use of ultrasonic flowmeters to measure gas flow. Initially, ultrasonic flowmeters were not well understood, and were sometimes misapplied. Many technological improvements have been made in the past 10 years, and the limitations of ultrasonic meters are better understood. Advances in transit time technology have broadened the types of liquids that transit time flowmeters can be used on. Many transit time meters today can handle liquids containing some impurities. A transit time ultrasonic flowmeter has 2 sensors, and both are transceivers. They send ultrasonic signals across the pipe at an angle; one with the flow, and the other against the flow. The signal against the flow is received late than the signal with the flow direction. This time difference (Transit time) is proportionate to the velocity of flow. This is how the velocity of the medium is found or this is the working principle of Transit time Ultrasonic flowmeters. And once the velocity of the medium is known we can calculate the flowrate by multiplying it with cross sectional area of the pipe a