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'[EE]: water level detection, how?'
2004\06\08@233521 by John Waters

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Hi All,

I have a tank with a submersible pump inside, I want to stop the pump from
running dry when the water level is too low, what sort of sensor could I
use? I'm thinking of using a float with a magnet attached, the magnetic
field will trigger a relay to turn off the power, does anyone get experience
in building this kind of thing and would like to share the experience with
me?

Thanks in advance!

John

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2004\06\09@015623 by tin=22?=

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how about ultrasonic distanc measurement between top of the tank and water level?
how about water pressure measurement on the bottom of the tank?
tino

******************************************************************************************************

>{Original Message removed}

2004\06\09@054403 by Roland

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face
You don't say how deep the tank is, etc, but the cheapest way (free) is the
water level sensor from any old washing machine. There are normally two
switches in there for a full level and a rinse level, (and they last forever)

Since the switches operate on a really low pressure, you can
configure/alter the depth/hysterisis by changing the tube thickness or
including small air reservoirs/pockets in the tubing system .

Regards
Roland

At 08:35 PM 08/06/04 -0700, you wrote:
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2004\06\09@201440 by p.cousens

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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.

{Original Message removed}

2004\06\09@202308 by Hopkins

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----- Original Message -----
From: "p.cousens" <.....p.cousensKILLspamspam.....BISCIT.BIZ>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.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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2004\06\09@234427 by Peter van Hoof

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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 removed}

2004\06\11@212453 by hilip Stortz

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goldmine <http://www.goldmine-elec.com> or <http://www.allelectronics> are selling an
ultrasonic level detector/pump controller surplus, and cheaply as i
recall.  alternately, motorola is making an  e-field/capacitance sensor
chip that can easily be used for non-contact level sensing of conductive
or nonconductive fluids.  you putt a couple of electrodes down the
inside walls of a length of pvc pipe and look at the capacitance change.
alternately, for and non-continous output you can just put 2 sensors at
the level you care about and look at the large change in value as the
fluid covers/uncovers that part of the pipe.  the capacitance approach
should be highly durable, easily cleaned and relatively insensitive to
dirt/oil etc. and will work with oils or other insulators as well as
water (though the values will be different depending on the fluid
involved), and you are only passing a very slight low frequency field
through the fluid with no dc component, no electrode contact, etc.

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