Im looking for a flowmeter for wastewater application. it will be in line and built on the discharge pipe (6 inches diameter) Does anybody have experience or suggestion?
A mag flow (electro magnetic flow meter) or a time of flight are the normal solution. ABB, Danfoss or Endress and Hauser are typical suppliers (of many) of this equipment.
If the pipe flows full all the time, mag meter is good.
If it does not flow full, maybe a Parschal flume.
I have not had consistently good success with ultrasonics in permanent installations. Flow is affected by TSS in wastewater.
Rosemount is a brand of instruments, not a type of flow meter. I don't know what kind you are referring to. Rosemount is generally good.