🚀 go-pugleaf

FCI has some that will do it, but don't expect to get one cheap. Last time
we got one, it was in the $1500 range. http://www.fluidcomponents.com/

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Electricity from the sun since 1979
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Mike <erazmus@wantree.com.au> wrote in message
news:7o0n7q$fm2$1@centipede.wantree.com.au...
> In article <7o0lgo$qga$1@bgtnsc03.worldnet.att.net>,
> benmiller@worldnet.att.net says...
>
> >What flow rate range do you need to measure, and at what accuracy?
>
> Ah - ha - thats a good question ~`:o
>
> Anywhere from 0.1 to 20 Litres/min of equivalent atmospheric pressure,
hence
> proportional to that mass flow at the higher pressures I'm interested in.
> I believe air mass (STP) is around 1.6g/m^3 therefore I'd be looking to
> measure the flow of 0.16mg to 320mg per minute at STP. Since the pressure
> can vary from 500psi to 5000psi then I'd be looking at minimum flow of
> around 0.16mg x 500/14.7 to a (high) maximum of 320mg x 5000/14.7 per
minute,
> thats a dynamic range of about 5 decades ie 5 to about 100,000. Hence I'd
be
> looking to resolve to 16 bits best case and 12bits worst case (since I
> will handle some scaling to bring down the dynamic range once I have
settled
> on the best pressure range). Absolute accuracy need only be 5% at this
stage
> to keep costs down but would like to achieve repeatability.
>
> Once I've decided on the best range of operation, then I expect I will
only
> need to resolve to 12bits A to D and accuracy of about 2%.
>
> Response time to change in flow should be less than 5mS if at all
possible.
>
> --
> Rgds ~`:o)
> Mike
> Perth, Western Australia
> Mailto: <erazmus@wantree.com.au>
> 99% efficient RAPS charger, GMH Turbo with Twin tyres, surplus parts etc
> http://www.wantree.com.au/~erazmus
> Some say there is no magic but, all things begin with thought then it
becomes
> academic, then some poor slob works out a practical way to implement all
that
> theory, this is called Engineering - for most people another form of
magic.
> " ...mmm thats because the laws of physics exceed the boundaries of the
> contractual agreement (and the money ain't enough either)...  "
>