Cost aside, I prefer to use the best available technology to perform any type of measurement function. If I needed an accurate flowmeter and also density measurement, I would specify a coriolis meter. You would have to contact a vendor to match it's suitability for slurry, particularly if you are transferring abrasives. I do not know of any other flow measurement technology that will also deliver density measurement.
Brad Waybright
It's all okay as long as it's okay.