Re: Ph probe problem

• To: Aquatic-Plants at actwin_com
• Subject: Re: Ph probe problem
• From: Stephen.Pushak at saudan_HAC.COM
• Date: Wed, 08 May 1996 10:58:14 PDT
• In-Reply-To: <199605080739.DAA23787 at looney_actwin.com>; from "Aquatic-Plants-Owner at ActWin_com" at May 08, 96 3:39 am

> From: Andrew Hamilton <andrewha at tafe_sa.edu.au>
> 
> My current thoughts on
> rectifying the problem is to section the probe of under the hood from the
> lights by using a wall made from plumbers lead. Does this sound feasible? Is
> it necassary to earth the lead? Will the magnetic field pass through the
> glass lids and into the water, therefore going around the lead barrier? Is
> there some way of making something along the lines of an earth leakage
> circuit to drainthe magnetic field? 

The problem is induced voltage caused by an electric field not a static
magnetic field. You can use aluminum foil as an effective shield. Yes,
I believe it should be grounded (connected to earth). Water is a conductor
and if connected to the ground circuit, it will also act as a shield
(although much less effective than metal). I won't go further into
electro-magnetic effects and theory since my attempts to clarify the
difference between electric and magnetic fields may only confuse and I
am not a physicist. ;-)

Steve

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