RE: Measuring bath water depth

["Marcus Warrington" <marcusw@xxxxxxx>]

Date: Mon, 12 Aug 2002 From: "PatrickLidstone"
<patrickl@xxxxxxx>

Campbells post got me thinking again about this - I know that there
have been various suggestions in the past ranging from strain gauges
to pressure sensing - but how about ultrasound?

I seem to remember seeing some magnetic bathplugs that would
"open" when
the bath got to deep, and shut when it was shallow.. can't remember
where
I saw them though..

I must say I very much like the idea of automated bath.. but am
wondering
how exactly the actual physical TAP is bypassed.. or do you just have
to
remember to leave the physical tap in the OPEN position and then rely
on
the automated valve to turn on and off ?

Considering that I'm supposed to be installing our new bathroom in a
few
weeks this post has pricked my interest :)

I imagine a water surface reflects ultrasound well. If this is true,
and the accuracy of an ultrasound tape-measure is reasonable (like
the kind used by estate agents), ceiling mounted sensors might work
quite well? Anyone who has an ultrasound rule want to do a quick
feasibility test?

I seem to remember that they have an accuracy of about 1inch.. but how
would
you get the thing to trigger the "bath full" event at the
required depth ?
One thing that would concern me is "what if it failed" one day
and flooded
the whole house. I think SWMBO would want to be assured that there was
some
form of fail safe device.

Marcus

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