RE: RE: Measuring bath water depth

["James Hoye" <james.hoye@xxxxxxx>]

> > 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.

Isn't the overflow designed to do this?

> Just a thought ..... would a timed operation be any good.....? eg when
I
> get home from work at night (after cycling, so I have a bath every
night
> to relieve any aches and pains!)  I can switch the hot tap on,
set a

Careful you don't rust in there Doogie ;)

> timer for 7 mins, and the bath is at a reasonable depth, and generally
a
> reasonable temperature, obviously depends exactly on water heating
> method - mine is an electric system which heats a storage tank of
hot
> water every morning, and when thats exhausted, the water out of the
hot
> tap is quite cold, but not as cold as the cold tap.... :S If there's
an
> X10 control there to open the valve, a timed switch off is
obviously
> reasonably easy with any of the current controllers... :)

I wouldn't trust X10 to be reliable enough here.  This is IMHO where
a
hardwired is required.  You did install CAT5 in the bathroom, didn't
you? ;)

> There will also be obvious differences in temperature (In winter
the
> cold tap will be colder than in summer) but the volume of water for
a
> known valve open diameter should be pretty much constant.........?

Assuming that none of your bath taps are reliant on mains pressure then
the
above hold fairly true.

I must admit, I like the idea about using an ultrasonic tape measure
thingy - it must be possible to get at the signal levels before it
displays
then on an LCD and pump them out as serial data to a controller
(HV?).  Set
discretely into the ceiling and Robert's your auntie's live in lover.
Of course, you will need to have the necessary test equipment (an
oscilloscope sounds pretty handy) to delve into the tape measure's
innards.

James H

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