DFX Doppler Ultrasonic Flowmeter

APPLICATIONS

Successful application of Doppler ultrasonic flow meters relies on three physical constraints:

• The liquid flowing within the pipe must contain 100 ppm of useful sonic-suspended reflectors. Dissolved solids do not generate reflections and are not relevant.
• A significant portion of the ultrasound energy generated by the transducer must reach the sonic reflectors. The ultrasonic transducer must be acoustically coupled to the outside of a pipe (using grease or RTV couplant) and the pipe must permit ultrasound to pass without significant attenuation. Most pipes constructed of solid, homogenous materials meet this qualification. Pipes that cause application difficulty include concrete pressure pipes, wood stave pipes, Teflon®-lined pipes, and fiberglass reinforced pipes.
• The pipe must be completely filled with liquid when measurements are made. The DFX microprocessor assumes that the pipe is completely full when it calculates the flow rate. The use of partially-filled pipes may result in inaccurate readings.