Advanced Electro Ceramics

Ultrasonic Flow Sensor-Concept

CeramTec has developed an ultrasonic flow measurement sensor with a disposable inline tube to accurately measure the flow of a fluid utilising the time of flight technology.

This non-contact ultrasonic flow measurement sensor provides some key features over existing technologies such as thermal mass transfer and X-illumination, including:

  • Calibration free operation
  • Up to 5 times higher accuracy compared with
    existing X-illumination at low flow rates
  • Rapid response time – takes up to 9 readings
    per second
  • Sensors do not come into contact the fluid
  • Quick and easy installation
  • Low cost disposable flow tube – lower cost construction

These features make our non-contact ultrasonic flow measurement sensor particularly suitable for use in the medical industry in areas such as dialysis machines and blood apheresis where the flow rate of blood is a vital parameter to measure. The fact that the sensors never come into contact with the fluid means that they do not need to be cleaned, eliminating the chance of the blood being contaminated by the sensors and greatly reducing the risk infection through the use of the low cost disposable flow tube.

Utilising an evaluation bard from Acam (GP30) connected to a computer, experimental data has been captured analysed. An equivalent evaluation board is also available from Texas instruments.

In the graph below, you can see our real experimentation results showing an excellent accuracy over a wide range of flow rates up to 500ml/min

This is the raw data collected from our in-house experiments on our custom designed flow tube, the trend line on graph displays a correction factor that could be programmed into the electronics, increasing the accuracy.

We have extensive knowledge in the field of non-invasive ultrasonic flow measurement. We have developed our products to measure the flow of many fluids including water, blood, saline and buffer solutions.

Recommended Contacts

If you would like to learn more about this technology and how CeramTec can support your flow measurement needs, please click on the button “Contacts” to the right, to get a list with the personal and direct responsible contacts within the CeramTec Group.