This principle of measurement is also referred to as the transit time difference method. For measuring the flow rate of liquids using this technique, ultrasonic pulses are sent and received simultaneously through the medium in the direction of flow and against it. The sensors work alternately as transmitter and receiver. The transit time of the acoustic signals filtered through the medium in the direction of flow is shorter than that against it. The difference in transit time Δt is measured and can be used to calculate the average flow velocity of liquids filtering through the acoustic path. After measuring the flow velocity and with the pipe cross-sectional area, volumetric flow can be calculated.
These ultrasonic flowmeters have many benefits, for example, the measuring instruments produce accurate results in just a matter of minutes, they are easy to install and operate, there is no process interruption and there are no pipe restrictions. As a result, there is no pressure loss and therefore, time and cost savings as the ultrasonic flow meter is easy to install on the pipe.
Advantages of non-invasive measuring with the ultrasonic flowmeters:
Device-related advantages of the ultrasonic flow measurement equipment compared to other products:
Measurement-related advantages of the ultrasonic flow meter:
Cost advantages of the ultrasonic flowmeters:
resulting in an excellent cost-benefit ratio.
Flow rate measurement in liquid-filled pipes, HVAC systems, pump and technical system verification, boiler testing, leak detection, filter sizing, fire and hydraulic systems.
Non-contact measurement from the outside means that the ultrasonic flow measuring instrument is indispensable in many branches of industry, such as, water management, building services, energy sector, chemical and pharmaceutical, food technology and petrochemical.
Aggressive, toxic, high-viscosity and non-conductive fluids
Flow measurement of various intermediate or end products, e.g. tar, bitumen
Measuring liquid hydrocarbon
Operational measuring of coolants and boiler feed water, condensate
Pharmaceutical, Semiconductor Industry
Ultrapure liquids / fluids
Hygienic measuring in bottling plants or tank installations
Water / sewage
Measuring in large pipes and underground pipes and ducts
Plant engineering and construction
Any flow rate measurement, e.g. leakage detection in hydraulic plants, pump verification
Testing hydraulic, supply and cooling systems
These are just some examples of typical mediums in various branches of industry.
Other mediums suited for this principle of measurement:
de-mineralized water, drinking water, river water, water-glycol mixtures, hydraulic oil, diesel, fuel oil, petroleum products, etc.