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Ultrasonic UA Liquids

Ultrasonic Flow Sensors for Liquids

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Ultrasonic UA

Ultrasonic UA - ExactSonic III - portable ultrasonic flow meter for liquids

ExactSonic III - Portable Ultrasonic Flow Measurement

The ExactSonic III operates using the ultrasonic transit-time difference method, a precise and proven measurement principle. The sensors alternately transmit ultrasonic pulses through the medium in the direction of flow and against the flow. Each sensor alternately acts as both a transmitter and a receiver. 

Since sound signals travel faster in the direction of flow than against the flow, a measurable transit-time difference (Δt) results. This difference is precisely recorded, allowing reliable determination of the average flow velocity. 

Based on the determined velocity and the calculated pipe cross-section the device then calculates the volumetric flow rate - that is, the actual flow rate of the liquid. 

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Measurement principle of Ultrasonic Flow Measurement

The principle of measurement behind ultrasonic flow measurement offers numerous advantages and has established itself as a reliable and efficient method. Users benefit from accurate measurement results within minutes, easy operation and flow measurement without interrupting the process.

Since the sensors are mounted on the outside of the pipe, there is no instrusion into the cross-sectionm which means there is no pressure loss. At the same time, the easy installation saves time and money.

Advantages of Ultrasonic Flow Measurement

Advantages of non-contact measurement with ultrasonic flow meters:

  • Installation during ongoing plant operation, without process downtime
  • Simple and cost-effective installation
  • High mobility thanks to low weight and ergonomic design
  • Ideal for use in service and comissioning
  • Quick inspection of stationary measuring systems

Advantages compared to other methods

Economic advantages 

  • Highly independent from medium properties such as conductivity, density, temperature or viscosity
  • No moving parts in the device
  • No internal components within the pipeline → no cross-section loss and no pressure drop
  • Virtually maintenance-free operation
  • No risk of clogging or leakage
  • Precise measurement even of lowest flow velocities starting at 0.2 m/s →  high turndown ratio
  • Easy retrofitting into existing systems
  • Low installation and operating costs
  • No cleaning or maintenance required for the sensors
  • Excellent cost-benefit ratio

Use and Application Examples of Ultrasonic Flow Rate Meters

Ultrasonic flow meters offer a wide range of applications for measuring the flow of liquids. Typical applications include:

  • Flow measurements in heating, air conditioning and ventilation systems
  • Monitoring and inspection of pumps and technical systems
  • Tests on boilers
  • Leak detection in pipelines
  • Filter and permeability measurements
  • Monitoring of fire extinguishing and hydraulic systems

The key advantage: Since there is no direct contact between the measuring device and the medium, ultrasonic flow measurement is particularly well-suited for industries with high requirements for safety, hygiene and process stability.


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Applications for Ultrasonic Flow Meters

Chemical Industry

Measurement of corrosive, toxic, high-viscosity or non-conductive liquids

Petrochemistry

Flow measurement of intermediate and final products such as tar or bitumen

Offshore-Industry

Measurement of liquid hydrocarbons under demanding conditions

Power plants

Monitoring the flow of cooling water, boiler feed water or condensate

Pharma- and semiconductor industry

Measurement of high-purity fluid without the risk of contamination

Beverage industry

Hygienic flow control in filling and tank systems

Water and wastewater management

Reliable measurement even in large pipes or underground lines

Machinery and plant engineering

A wide range of applications, e.g. leak detection in hydraulic systems or pump monitoring

Aviation industry

Inspection of hydraulic-, supply- and cooling systems

 

Suitable measuring media

In addition to conventional media such as drinking water, river water and fully demineralized water, numerous specialty media can also be measured without any problems, including:

  • Water-glycol mixtures
  • Hydraulic oil
  • Diesel, heating oil and other petroleum products

Technical Specifications of the Ultrasonic Flow Meter

  • Flow velocity of liquids in pipelines from 0.2 to 20 m/s
  • +/- Flow direction detection
  • Measurement uncertainty: pipe OD > 75 mm: ± 2 % of the measured value
  • Menu-driven operation
  • Backlit display, resolution 64 x 240 pixels
  • 16-button control panel for parameter settings
  • Battery and mains power supply
  • Battery life up to 20 hours
  • Supply voltage 110 to 240 VAC +/-10 %
  • User languages: German, English, French, Russian, Spanish
  • Includes two pairs of measuring transducers 'A' & 'B': pair 'A' for pipe-OD 13 to 115 mm pair 'B' for pipe-OD 50 to 2000 mm
  • Temperature range of measuring transducer pairs: -20 to +135 °C
  • Outputs 0/4-20 mA, USB, opto-isolated 5V pulse output, max. 1 pulse/s
  • Data logger: 8 GB, 20 indexable recording blocks, display in text or graphical form, copy to USB flash drive
  • Supplied with a robust IP67 carrying case
ExactSonic III - U456 Operating instruction ExactSonic III - U455