ULTRASONE VLOEISTOF FLOWMETER

Elke transducer kan zenden en ontvangen, daarom worden alle stroomopwaartse en stroomafwaartse combinaties opgenomen en verwerkt. Door nauwkleurig het tijdsverschil tussen de opnames (nanosecondebereik) te meten wordt de stroomsnelheid en geluidssnelheid berekend. Door deze parameters en de exacte buisdoorsnede te kennen, is de ES-FLOW™ in staat om vloeistofvolumeflows in het bereik van 4 tot 1500 ml/min te meten. 
 

Het onderscheidend vermogen van deze flowmeter is dat hij in staat is om de werkelijke geluidssnelheid te meten, wat betekent dat de technologie vloeistofonafhankelijk is en kalibratie per vloeistof niet nodig is. 

Other (traditional) ultrasonic flow measuring principles

(Source: Wikipedia. Note well, these techniques are completely different to the technology Bronkhorst applies in their ES-FLOW series and can therefore not be compared.)

Transit time principle

Ultrasonic flow meters measure the difference of the transit time of ultrasonic pulses propagating in a flowing fluid. This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. By using the absolute transit times both the averaged fluid velocity and the speed of sound can be calculated. This measurement principle is only possibly for large bore tubes, for higher flow ranges than the scope of Bronkhorst.

Product link: SONIC-VIEW

Doppler effect principle

Another method in ultrasonic flow metering, also not suited for very low flowrates, is the use of the Doppler shift that results from the reflection of an ultrasonic beam off sonically reflective materials, such as solid particles or entrained air bubbles in a flowing fluid, or the turbulence of the fluid itself, if the liquid is clean.