From: John Cremati (johnjohnc@core.com)
Date: 05/05/03-06:04:42 PM Z
I imaging you can jumper the themostat portion of the submersible heater
and put the whole thing on a variac or reostat to control its output. The
ones that I am envisioning were in a test tube about 8 inches long...
----- Original Message -----
From: "Sandy King" <sanking@clemson.edu>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Monday, May 05, 2003 7:51 PM
Subject: Re: Aquarium heater alternatives
>
> Guess I had better explain what I am doing so you will really know
> that is alt stuff.
>
> For a while now I have been making carbon tissue using a flexible
> magnetic sheeting frame over a plate of galvanized steel, in which I
> pour the pigmented gelatin. I pour an excess of solution into the
> opening, and then smooth it out by rolling over it with a very warm
> stainless steel rod of about 1 1/4" OD, which leaves a gelatin
> coating exactly the same thickness as the magnetic sheeting material.
> The rod is preheated to about 110F before I began the coating
> operation, and at this temperature it works perfectly, smoothing out
> the surface of the carbon tissue, blowing away the bubbles and oil,
> and leaving a surface that is mirror smooth and nice as any
> commercial tissue one might have been able to buy in the past. The
> problem is, the rod cools quickly.
>
> What I want to do is encapsulate a submersible heater inside a water
> filled hollow tube of stainless steel to keep the rod at a steady
> 110F, thus obviating the need to return it constantly to hot water
> for re-heating. The problem is those aquarium folks are concerned
> about those wimpy little tropical fish getting warmer than about 95F
> so they have a setting on the heater that prevents you from setting
> it at more than that temperature and cooking their tails.
>
> And thanks for all the advice, here on list and off.
>
> Sandy King
>
>
>
>
>
> >Sandy King said in his message...
> >
> >>The question is, does anyone know a source for small submersible
> >>pumps of the type used in aquariums (round, 6-12" long, about 5/8"
> >>diamter) but which allow for heating to 115-25F? The aquarium pumps
> >>have a limit of around 90F, which is good for fish but it fall just
> >>below my need.
> >
> >I've been using the same submersible aquarium heater for 19 years and was
> >sweating it's demise for that very reason: the new ones have a limit that
> >prevents cooking the fish.
> >
> >A friend and student provided peace of mind by kindly giving me a
> >terrific tray heater that has no moving parts and includes evaporation
> >protection that cuts the heat if the tray solution level drops too low.
> >
> >Doran Enterprises has the Temperature Control Model TC-750 at the
> >following:
> >
> >http://myweb.ecomplanet.com/DOEI4233/
> >
> >This unit is adjustable and will let you crank your developer temperature
> >to 115F and higher. I use it to heat water in a larger try in which my
> >developer tray rests on four stainless Nikkor reels (gotta use those old
> >phylm things for something). It's a standard double-boiler setup.
> >
> >Hope this helps!
> >
> >Dan
>
>
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