81900Re: [Electronics_101] Re: Inexpensive GPM meter
- May 8, 2013Some flow meters use ultrasonic waves, very ingenious.
Any kind of orifice device may reduce the flow rate you try to measure.
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 wheel.
On Wed, May 8, 2013 at 7:59 PM, Howard Hansen <hrhan@...> 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.
> 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 transducer.
> 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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