Gerhard Fiedler <lists <at> connectionbrazil.com> writes:

> I wouldn't use an external heater. Using the temperature sensor itself as
> heater (which is usually possible with resistive sensors), you can make a
> suitable sensor yourself and you also don't have really a problem with the
> required power. Unless you want to make a battery-operated device :)

I looked it up some more and the method is limited to low flows. When high flows
are measured then the measuring branch is configured as a side branch that short
circuits a metering orifice or restriction. Also most instruments are limited to
a  flow range of 20:1 or so.

I think that it makes sense to consider a flow meter a specialised instrument
and use one that suits tha application. I.e. in the context of the o.p. there is
no such thing as a universal flowmeter. And the water wheel type may be the best
for his type of application.

Peter


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