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From: "Owen Lawrence"
Subject: Re: Water sensor
Date: Fri, 10 Jan 2003 09:30:11 -0500
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>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.
Here's a couple of crude one-shot ideas:
What if you soak a small piece of paper in salt water and then let it
dry out? You can then clip a couple of leads to it, and place it where the
water will go. A few drops will be enough to soak the paper from lead to
lead, and it should conduct wll enough to detect easily.
Another idea is to put an aspirin between two contacts in a clothespin.
When water hits the aspirin it falls apart, the clothespin snaps shut, and
the contacts join. Just don't use brass contacts (or others that acid can
corrode); I did this once, and when the real-life accident water dissolved
the aspirin there was so much crud the contacts didn't work. The same
advice goes for the first idea, too.
- Owen -
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