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Re: [APD] hydrogen sulfide - thanks

You have my curiousity sparked.

So this is running AC at 60 volts? Why all the resistors?
To reduce the voltage across the across the substart cable
termina, I suppose. Why not let the substrate cable be the
only significant resistance. Those external resistors are
converting electrical energy to heat and then dumping it
outside the tank. Is the substrate cable copper or
nichromium?

What is the voltage across the substrate cable termina?

What kind of jacket is on the wire? Kapton? Teflon? Vinyl?
How did you seal the connections between the power lead and
the substrate cable?

sh



--- "Mariano F. Bonfante" <mariano_bonfante at hotmail_com>
wrote:

> Local outlets has 220V 50Hz, so I am using a 60Vca
> (typical en CATV 
> industry), galvanic insulation transformer for feeding
> the resistors. There 
> is also a dimmer circuit, to allow two phases: day and
> night. Daytime 
> permits the substrate to be 1ºC above the water, nigh
> phase just a bias 
> voltage.
> 
> Resistors are outside the tank, with the following
> configuration: a granite 
> plate over the tank stand, a Styrofoam plate (1/2 inch),
> the resistors, an 
> aluminum plate (1 mm), and above the tank. Resistors are
> solid rod type 
> (industrial standard), arranged in zigzag.  Everything is
> grounded for 
> safety issues.
> 
> This system has been working for 2 years, it is very easy
> to check if it is 
> working properly.
> 
> Cables buried into the substrate trend to fail in the
> long term at least in 
> my experience. Moisture finds it way to get inside the
> jacket, and corrosion 
> did the rest. Other side effect was that long roots wrap
> around the cables, 
> therefore they were pulled out the substrate when a plant
> was removed
> 
> I spent some time with these systems, but it is fun and I
> like it.
> 
> 
> Mariano
> 
> 
> 
> 
> >From: "S. Hieber" <shieber at yahoo_com>
> >Reply-To: aquatic plants digest
> <aquatic-plants at actwin_com>
> >To: aquatic plants digest <aquatic-plants at actwin_com>
> >Subject: Re: [APD] hydrogen sulfide - thanks
> >Date: Thu, 1 Sep 2005 10:10:55 -0700 (PDT)
> >
> >Sure thing. I spent a tidy some for parts for CO2 mixers
> >(a.k.a. reactors). Didn't have any use for them all.
> Just
> >playing around with parts.
> >
> >Is the heater AC or DC?
> >
> >sh
> >
> >--- "Mariano F. Bonfante" <mariano_bonfante at hotmail_com>
> >wrote:
> >
> > > For sure, but pls consider that I have never bought a
> > > commercial heating
> > > system. I have made my own prototypes with standard
> > > electrical stuff. Don?t
> > > get me wrong, is a side of the hobby for me.
> > >
> > > MFB
> > >
> > >
> > >
> > > >From: "S. Hieber" <shieber at yahoo_com>
> > > >Reply-To: aquatic plants digest
> > > <aquatic-plants at actwin_com>
> > > >To: aquatic plants digest
> <aquatic-plants at actwin_com>
> > > >Subject: Re: [APD] hydrogen sulfide - thanks
> > > >Date: Thu, 1 Sep 2005 07:30:54 -0700 (PDT)
> > > >
> > > >Worth noting! That sound off in the distance could
> be
> > > >someone shouting, "Told ya so."
> > > >
> > > >Occassionally poking the substrate is a much less
> > > expensive
> > > >way to accomplish the same result.
> > > >
> > > >Scott H.
> > > >
> > > >--- "Mariano F. Bonfante"
> <mariano_bonfante at hotmail_com>
> > > >wrote:
> > > >
> > > > > I have been using different types of substrate
> > > heaters
> > > > > since a long time,
> > > > > when I first read about them. Although this
> subject
> > > > > became controversial
> > > > > years after, I have experienced when the system
> is
> > > > > working properly, that
> > > > > chances of getting anaerobic spots is rather
> scarce.
> > > > >
> > > > > Mariano
> > > > >
> > > > >
> > > > >
> > > > > >From: Stuart Halliday
> <stuart at stuarthalliday_com>
> > > > > >Reply-To: stuart at stuarthalliday_com,       
> aquatic
> > > > > plants digest
> > > > > ><aquatic-plants at actwin_com>
> > > > > >To: aquatic plants digest
> > > <aquatic-plants at actwin_com>
> > > > > >Subject: Re: [APD] hydrogen sulfide - thanks
> > > > > >Date: Thu, 01 Sep 2005 10:19:10 +0100
> > > > > >
> > > > > >Mark Gilmore wrote:
> > > > > > > Stuart - thanks for the tips of my hydrogen
> > > sulfide
> > > > > disaster.  The trick
> > > > > > > now will be catching fish in the densely
> planted
> > > tank
> > > > > before I start
> > > > > > > stirring up the substrate.
> > > > > >
> > > > > >Good point.
> > > > > >
> > > > > >How about this idea. Put in an aerator on high
> for
> > > an
> > > > > hour or two so
> > > > > >you've got lots of oxygen in the water and then
> poke
> > > say
> > > > > 10% of the
> > > > > >substrate. Then leave it for an hour before
> poking
> > > the
> > > > > next area.
> > > > > >
> > > > > >This way any nasty gases can't dissolve into the
> > > water
> > > > > as it's already
> > > > > >saturated with oxygen?
> > > > > >
> > > > > >--
> > > > > >Stuart Halliday
> > > > > >_______________________________________________
> > > > > >Aquatic-Plants mailing list
> > > > > >Aquatic-Plants at actwin_com
> > > > >
> > >
> >http://www.actwin.com/mailman/listinfo/aquatic-plants
> > > > >
> > > > >
> > > > > _______________________________________________
> > > > > Aquatic-Plants mailing list
> > > > > Aquatic-Plants at actwin_com
> > > > >
> http://www.actwin.com/mailman/listinfo/aquatic-plants
> > > > >
> > > >
> > > >_______________________________________________
> > > >Aquatic-Plants mailing list
> > > >Aquatic-Plants at actwin_com
> > >
> >http://www.actwin.com/mailman/listinfo/aquatic-plants
> > >
> > >
> > > _______________________________________________
> > > Aquatic-Plants mailing list
> > > Aquatic-Plants at actwin_com
> > > http://www.actwin.com/mailman/listinfo/aquatic-plants
> > >
> >
> >_______________________________________________
> >Aquatic-Plants mailing list
> >Aquatic-Plants at actwin_com
> >http://www.actwin.com/mailman/listinfo/aquatic-plants
> 
> 
> _______________________________________________
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
> http://www.actwin.com/mailman/listinfo/aquatic-plants
> 


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