Re: RE: Measuring bath water depth

["Campbell" <campbell@xxxxxxx>]

The way I have done it enables the original taps to be used at all
times.....I have teed off the hot water just before the tap, into an
inline
valve (always open) and then through the motorised valve a compression
elbow
and then a chromed pipe bent to shape. I was considering using another
tap,
but am pleased with the simple bent chrome pipe and chrome plastic
collar.
The elbow will be  replaced with a tee enabling a partial flow of cold
water
also, this will be preset by an inline valve.

Admittedly the flow is restricted due to the valves and the 15mm bore
pipe
used, baths are normally 22mm.

Eventually I will add a level control, watching this thread for ideas
and
hopefully some sort of feedback loop to control temperature. If this
all
works when I replace the bathroom I intend to fully automate the bath
and
have no taps. So far thanks to Mr Mollology (Ian) who recommends the
valves
on his site, and some simple bits this has been a relatively cheap
project

Campbell

----- Original Message -----
From: "Marcus Warrington" <marcusw@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, August 12, 2002 2:23 PM
Subject: [ukha_d] RE: Measuring bath water depth


>  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
>
>
>
>
> For more information: http://www.automatedhome.co.uk
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