Water sensor

dingo said:

That should work, haven't tested it. the first circuit might work with only one transistor I spose it depends on how wet your water is....... anyhow used a darlington pair to be on the safe side.

**broken link removed**

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Michaeneu said:

Thanks dingo, the second circuit worked perfectly. I'm using it to purge air out of a water system. Once again, thanks.

Michael

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e said:

I have a similar setup controlling the sump pump, oddly i didnt even need darlingtons, just standard PNPs and i did need to use a base current limiting resistor. Been working for about a year now..

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Michaeneu said:

I'm looking to build a simple water level detector that will de-energize a 12VDC relay when the sensors detect water. Once the water level decreases the relay must energize. I saw your water activated alarm but I would prefer to stick to transistors and avoid IC's if possible.

Your help would be greatly appreciated.

Michael

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Boncuk said:

How about using an automatic air bleed valve? It's used in heating systems and works perfect.

Boncuk

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Roff said:

The post you responded to is nearly 5 years old...

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Boncuk said:

honestly I didn't check the date. How come this old post appears in a new thread?

At least it seemed to be a new one being posted on the first page.

Hans

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