Q: I have a question regarding vortex flowmeters and hope that you can clear it up. The line size is 3 in.; the flow is minimum 6 m³/hr, normal 20 m³/hr, maximum 22 m³/hr. The vendor suggested using a 3-in. Endress+Hauser (E+H) Prowirl vortex flowmeter with minimum flow 4.03 m³/hr, maximum flow 138.22 m³/hr. That unit has a three-point calibration (30%, 45% and 65%). My client has the following questions: Why has the vortex flowmeter not been calibrated for a lesser span range of 0-25 m³/hr? What happens if the flow drops below 4 m³/hr? Can you let me know if my selected size is acceptable or I should use a smaller meter? If I keep the 3-in. meter, is it possible…Full Story
How can we determine the best size to balance accuracy against pressure drop?