The flow meter from that URL has nothing to do with heat measurement - it is a standard turbine type flow meter. It has a mechanical (gear ratio) calculation of flow from the rotor speed. What I said still applys - it measures essentially the same water speed whether the flow tube is half full or totally full.
It should be mounted vertically to insure a full flow tube and hence accurate mechanical calculation of the flow. An interesting observation is that this flow meter may actually subtract any reverse flow from the accumulated total (reverse flow measurement having been an issue with DGT). Whether it does this or not would be determined by whether or not there is a mechanical racheting mechanism in the gear train (probably not). On Mon, Aug 8, 2016 at 9:04 AM, Jed Rothwell <[email protected]> wrote: > Bob Higgins <[email protected]> wrote: > > What I meant is that the flow axis (also the turbine propeller axis) >> should be vertical to insure that the flow tube (housing the turbine) is >> fully filled. >> >> I believe such turbines have a rotor (like a propeller) with an axis >> coaxial with the flow tube and low blockage spider supports . . . >> > > Someone told me this is a brochure for this flow meter: > > http://www.apator.com/uploads/files/Produkty/Przetworniki_ > przeplywu_do_cieplomierzy/MWN130-NC_MP130-NC/karta-mwn-nc130.pdf > > It is in Polish, so I can't be sure it is the right one. You can Google > translate the text. The first paragraph, for example, comes out: > > "The heat flow transducer with a horizontal rotor axis, parallel to the > water pipes with a low starting threshold. Thanks to modern structural > solutions - technology It provides credibility indications and enables the > development of atypical systems in intermediate positions without affecting > its performance metrology. . . ." > > > Anyway, this shows an exploded view of the instrument, etc. > > Perhaps this answers some of your questions. > > - Jed > >
