RE: Measuring bath water depth

["Stu Worrall" <stuart@xxxxxxx>]

Ultrasound definitely reflects off water.  When I worked in the
water
industry they used to have ultrasonic probes at the top of each
"wet
well".  These probes decided when to start the pumps depending on
the
level. They were also inteligent in that they had multiple start points
so that if the well was filling too quickly then too pumps would start
instead of one.  Not sure if this was controlled by a plc or the
unit
itself.

Cant remember the manufactures though and they were quite big. 
Maybe
mount one in the ceiling and have the electronics in the loft?

Thanks

Stu

-----Original Message-----
From: PatrickLidstone [mailto:patrickl@xxxxxxx] 
Sent: 12 August 2002 12:45
To: ukha_d@xxxxxxx
Subject: [ukha_d] Measuring bath water depth


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 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?

Patrick



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