An other option to think about here:
some pumps (pump seals are the possible cuprate) dont like to sit idle for
too long either they wont start back up!
In a pump circuit i have built i run it 5 seconds ewach 24 hours no matter
what.

Peter
----- Original Message -----
From: "Hopkins" <rdhopkins@IHUG.CO.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, June 09, 2004 8:23 PM
Subject: Re: [EE]: water level detection, how?


> ----- Original Message -----
> From: "p.cousens" <p.cousens@BISCIT.BIZ>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, June 10, 2004 12:15 PM
> Subject: Re: [EE]: water level detection, how?
>
>
> > After you figure out the system you want to use
> > I personally always like to incorporate a watchdog timer
> > If the pump runs for more than I would normally expect it to run, I shut
> > it down
> > Requiring a manual reset
> > I've seen to many pumps run dry for days due to faulty automatic
> > controls.
> >
>
> Also suggest wire the stop pump microswitch contact so that it is "Fail
> Safe" that is to say the pump stops if the contact or wiring goes open
> circuit.
>
> This ensures you have positive control of the pump motor in the event the
> switch fails or the wiring becomes disconnected.
> *************************************************
> Roy Hopkins   :-)
>
> Tauranga
> New Zealand
> *************************************************
>
>
>
>
>
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