Ultrasonic Flow Sensors
Method
Ultrasonic flow measurement is unique in that it allows for meter installation on the outside of your pipework without needing any tapping points or disruptions. It works by timing ultrasonic pulses sent both upstream and downstream from the sensors. As the flow speed increases, the time for pulses to travel downstream decreases, while the time for upstream pulses increases. By measuring this time difference, you can accurately determine the flow rate.
Typically, ultrasonic meters feature two transducers integrated into a single clamp-on unit.
Advantages
- Easy installation with no pipework modification required
- Suitable for aggressive media
- Non-invasive maintenance
- Capable of detecting both forward and reverse flow
Disadvantages
- Excessive cost
- Requires stable process conditions (temperature, humidity, pressure)
- Effective only within specific pressure and flow ranges for each media
Considerations
It is essential to conduct a trial with an ultrasonic flowmeter before purchase. Factors like low pressure, light gases, low flow rates, and unusual piping can affect performance. A pre-purchase test ensures the system meets your application needs.