The most commonly used ultrasonic flowmeter is the transit-time, single-path flowmeter due to its proven accuracy, flexibility, and low cost. Depending on the applications, the selection of the right type of flowmeter may vary. You may need to answer the following questions before making the final decision.

1. Is the pipe full? All ultrasonic flowmeters require that the pipes being measured are full of liquid. There are some effective approaches and available work-arounds for working with partially-full pipes, be sure to consult with the manufacturer or a factory trained technician.

2. Does the liquid have particles more than 200ppm and a particle size larger than 75um (the number may be different for different manufacturers)? If yes, you might want to consider using the Doppler principle.

3. Does the liquid temperature (particularly high heat applications) fall into the transducer temperature range?

4. Press range in the pipe (if you selected a wetted transducer)?

5. What is the desired level of measurement accuracy? In general, multi-path provides more accurate measurement than single path transducers, flow cell is better than insertion, and insertion is better than clamp-on. However, if you have on-site calibration facility, the story will change.

6. Do you want the capability of moving the flowmeter instrument from one location to the next? If so, consider a portable/clamp-on solution.

7. What output signals do you need? Analog? Digital? RS232? Data logger?

8. What are your safety requirements and considerations? Not all flowmeters can meet the specific safety requirements of all applications, be sure to consult with the manufacturer or a factory trained technician.

9. What is your pipe size range? Pipe material? Lining? Age?

10. What is your flow rate range?

11. Do you have enough straight pipe length? In order to guarantee the desired accuracy, it is normally recommended to have straight pipe equal to 15 times your pipe diameter at the measuring site. If there is a pump or valve on the upstream, the straight length should be increased.

12. What is your budget?

For More Information

Every flowmeter manufacturer utilizes these standard technologies and principles. As a result, there are a variety of brands on the market, and almost all flowmeter vendors provide some level of application expertise or professional services group that can answer your questions. Regardless, a thoughtful combination of quality, accuracy and cost should be the guiding criteria when selecting a manufacturer or manufacturer's rep.

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