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From: "John Jardine"
Subject: Re: Water sensor
Date: Fri, 10 Jan 2003 01:34:12 -0000
NNTP-Posting-Date: 10 Jan 2003 01:20:19 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Bruce Murphy wrote in message
> I've got a couple of applications that I would like to start building
> prototypes for but I realised that I'm outside the my realm of
> experience in one critical component -- water sensors.
> Can anyone share some experiences for water sensors capable of
> detecting fairly small amounts of arbitrarily-ionised water? (Small
> enough that the large-scale mechanical float techniques won't work)
> Ideally these would be as simple/cheap as possible -- one of the
> applications involves a sensor array to detect various critical water
> events for airconditioning that has been installed far too close to
> equipment I care about.
Assuming the water/tank is at 0V. A single metal probe at the correct height
in the tank can reliably detect when the water touches it.
+5v through a 100k resistor to the probe, monitor as a logic level and
Increase the resistor size if the water is *very* de-ionised.
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