219 East Main Street Mechanicsburg, Pennsylvania USA, 17055
Phone Numbers: Toll Free: 866-EESIFLO (866-337-4356)
or: 717-697-8546 or: 717-697-8648 Fax: 717-697-2122
Contact : Mark Hill markhill@eesiflo.us , Ron Alphin ronalphin@eesiflo.us
Transit Time Meter Basic Theory
Measurements are made by sending bursts of signals through a pipe . The measurement of flow is based on the principle that sound waves travelling in the direction of flow of the fluid require less time than when travelling in the opposite direction. At zero velocity , the transit time or delta T is zero. If we know the diameter of the pipe
Doppler Flowmeter Basic Theory
Doppler ultrasonic flowmeters operate on the Doppler shift principal , whereby the transmitted frequency is altered linearly by being reflected from particles and bubbles in the fluid. The net result is a frequency shift between transmitter and receiver frequencies that can be directly related to the flow velocity. If the pipe internal diameter is known, the volumetric flow rate can be calculated. Doppler meters require a minimum amount of solid particles or air in the line to achieve measurements.
