Mike, How about using concentration meters (sound velocity principle) from Anton-Paar or Optical refractometers (don't remember the manufacturer's name)? These are not cheap (~ A$ 25K to 30K). Raj
I have a control system I am working on the requires a specific
> gravity analyzer. Does anybody have any sources for these?
>
> Has anyone used the type manufactured by Princo Instruments?
>
> I need to measure nitric acid at a concentration of 20 to 45% by > volume.
>
> Thanks.