Dear Olin Perry Norton:
"Olin Perry Norton" wrote in message news:dt593v$9kh$ snipped-for-privacy@nntp.msstate.edu... ...
I'd shoot for laminar flow (Re near 2000), if the purpose was to keep the lines clear. (Or short bursts of turbulent, with "signal hold" on the reading.) You could calibrate against static pressure to get the flow-induced drop, and factor it out.
David A. Smith