Re: Water Flow Meter


"N Cook" <diverse8@xxxxxxxxx> wrote in message
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Arfa Daily <arfa.daily@xxxxxxxxxxxx> wrote in message
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"Michael Kennedy" <mikek400remthis@xxxxxxxxxxx> wrote in message
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"Smitty Two" <prestwhich@xxxxxxxxxxxxx> wrote in message
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In article <jfadnYvhCeOi-xPVnZ2dnUVZ_jCdnZ2d@xxxxxxxxxxx>,
"Michael Kennedy" <mikek400remthis@xxxxxxxxxxx> wrote:

Does anyone know where to get a water flow meter that will close or
open
a
switch when water is flowing? I have an AC unit that uses water to
cool
itself and it produces 110 deg water if you reduce the flow enough.
I'm
trying to build a setup that will switch between the on demand hot
water
heater and the AC unit for the house. The major difficulty is
determining if
there is water flow to the hot water lines in the hosue..

Thanks,

Mike

Jacuzzi heater safety switch is a NO switch that closes when water
flows
(i.e. pump is on and working.)

Thanks! I'll look into that. This may be exactly what I need. For use
with
hot water, and flow switch.

Mike

My (very typical) automatic shower pump has a flow operated switch in
both
the hot and cold sides, to start it up as soon as water flows as a result
of
opening the water valve. It's based on a small magnet that moves up
against
gravity in the water flow, and closes a reed switch. When the valve is
shut
and water flow ceases, it sinks back down, and the reed switch opens. If
you
know any plumbers, they're sure to have an old pump that they have
changed
lying around, that you could cull the switch assembly from.

Arfa



I've not come across those devices. Do you happen to know what the
resolution is between no flow and minimum recognisable flow. ? That is one
problem with ultrasonic Doppler shift flow sensor systems.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



I couldn't put you a figure on it, but turning the shower valve just a
quarter of a turn out of perhaps 3 turns available, equating to just about a
dribble of water from the shower head, is enough to activate it - I just
went and checked for you, how dedicated is that ??!! :-)

Very reliable system. Never fails to activate the pump. This shower is used
every day of the year by at least 2 people, and often as many as 5 people. I
am on my third pump in about 20 years. First (cheapo) one developed a motor
fault after doing stirling service as the kids grew up. Second one just wore
out its bearings, and became very noisy. Current one is heavy duty version,
rated for 'continuous' use, and has been in service probably about 5 years.
If you know any plumbers, I'm sure that they would have an old one lying
around the yard somewhere. All the ones I have owned / seen, employ the reed
switch method to control them.

Arfa


.

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