Leak detector

That chip looks like major overkill for this application. Do you know the wet and dry resistance ranges? You usully need neither speed nor high gain for this type of use.

Luhan

Well the reason I was looking at this was because this is going to be in a noisy environment and in this case the probes may act as antennas which may cause the sensor to report faulty output (detecting leak even when there is no leak). However if you have a simpler suggestion its most welcome. Thanks...

The usual solution to this kind of noise, since you probably dont need very fast response, is to do heavy filtering. I usually ground one of the probes (no noise on that one), and put some series resistor (10k ?) in series from the other probe with maybe 10 to 100 uf capacitor to ground. This should also get rid of stray 60hz pickup with a response time of a couple of seconds. If that works for you.

Luhan

What exactly is leaking?

I find that a lit match works pretty well for natural gas. ;-)

and i guess that would be termed as arson...... anyways its water leaking in very small amounts and in a very noisy environment........ some kind of differential method will be good I think.... thanks