81902Re: [Electronics_101] Re: Inexpensive GPM meter
- May 8, 2013On 5/8/2013 1:58 PM, Stefan Trethan wrote:
>Is a 5% reduction in maximum flow rate critical for this application?
> Some flow meters use ultrasonic waves, very ingenious.
> Any kind of orifice device may reduce the flow rate you try to measure.
The other Howard
>[Non-text portions of this message have been removed]
> I just had another idea, do you have a water meter?
> If you have one, just turn on the taps in question and time the little
> On Wed, May 8, 2013 at 7:59 PM, Howard Hansen <hrhan@...
> <mailto:hrhan%40att.net>> wrote:
> > Certainly, as suggested by others, timing how long it takes to fill a
> > container is the lowest cost approach.
> > For an electronic approach you could use 3 flow meters like the
> > following connected in parallel.
> > <http://www.seeedstudio.com/depot/g12-water-flow-sensor-p-635.html>
> > 25 GPM = 94.6 liters per minute.
> > To ensure the low is determine mainly by the 1 1/4 inch pipe you will
> > need at least 15 inches of 1 1/4 inc pipe connected to both sides of the
> > flow meters. See
> > <http://mdmetric.com/tech/thddat7.htm> for information on British BSP
> > G1/2 threads. If you have a short time frame this approach will not
> > work. There is a 2 to 3 week shipping time from China.
> > Another option is to use an orifice and a differential pressure
> > Yes a smaller diameter of pipe would be an indication of flow. But how
> > would you calibrate this type of flow meter?
> > The other Howard
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