A more condensed, cleaner run attached.
Uncertainties now are the water temperatures, I have only checked them briefly, not a full on steinhart recalibration. I am seeing odd bumps in the calculated flowrate every now and again, caused by a fluctuation in Water out, not sure what it is, electrical?, don't think it's a blockage, invisible in Water in and PD.
Les, what is the laminar-turbulant flow transition flowrate for 10mm ID pipe? I am seeing something at about 4.2lpm which I have seen before but assumed was my pump sequencing , but it is not I have since discovered. My flowrate errors seem to change sign at this point. Visible in the PQ plot. Not so obvious in the attached logfile, clearer with the higher sampling rate. (chart attached)
Curious.