On 26 Sep 97 at 15:13, Tjaart van der Walt wrote: > Pasi T Mustalahti wrote: > > > > On Mon, 26 May 1997, Mike Smith wrote: > > > > > On 26 Sep 97 at 13:10, Pasi T Mustalahti wrote: > > > > On Fri, 26 Sep 1997, Steve Smith wrote: > > > > > But you want a new method. Do you mean a new method of monitoring > > > flow, other than the conventional flow sensor, which basically turns > > > a paddle wheel with magnet/s in it past a hall effect device. Or > > > what? One way would be to use a metered dose pump, this way you know > > > how much is flowing. > > > > PTM: I mean new in that meaning, that in the mails about the accelerometer > > there came many nice ingenious methods. It would be nice to see if > > somebody can find a new solution to an old problem. Ok, I was just trying to define what you were looking for. > > > > If we have a system that doesn't move, where we have good space around and > > the result have not to be 'realtime' we could use cups... I try to make a > > picture > > > > o -----drops goming down > > o > > > > \ B / > > \ ---- / ---fluid in the cup > > A \ / > > ----------O ------axel > > > > When the cup B fills, the system tilts around the axel. fluid flows out of > > the cup and the drops start dropping to cup A. When it fills, the system > > tilts again, fluid flows out of cup A and cup B starts filling. Sounds like those things that measure rain (oops - thats now called a 'Growth Event ) > > > > This system works only in stabile environment. > > Aaah! - so you want to measure drops? It is easy then - use a piezo > electric transducer to 'measure' the weight of the drops. > > > o -----drops goming down > o > > ---- ---sensor (slightly slanted) > > Or a variation - in many cases like the above, the drops are regular size. Just count them - either using an interruptor (drop breaks beam) or count impacts (piezo again) This system would break down when the drops became a stream. MikeS (remove the you know what before replying)