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Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > Float switch how to?
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Old 12-31-2009, 07:41 PM   #1
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Default Float switch how to?

Does anyone know how to build your own float switch for a HLT?


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Old 12-31-2009, 07:46 PM   #2
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Yes, but first you have to crack the toilet.


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Old 01-01-2010, 07:04 PM   #3
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Originally Posted by GilaMinumBeer View Post
Yes, but first you have to crack the toilet.
Are you saying to use a toilet mechanism? Can it withstand the temperatures of an HLT?
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Old 01-01-2010, 08:03 PM   #4
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I cannot answer your question regarding a build, but you could modify a pressure sensing switch with silicone tube and a copper pipe so that it would withstand the heat.

If you are interested, I have a used one of these that I am willing to sell for about 50% of a new one.

http://www.spectrapure.com/St_alc_p1.htm
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Old 01-01-2010, 09:50 PM   #5
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Originally Posted by jeffmeh View Post
I cannot answer your question regarding a build, but you could modify a pressure sensing switch with silicone tube and a copper pipe so that it would withstand the heat.

If you are interested, I have a used one of these that I am willing to sell for about 50% of a new one.

http://www.spectrapure.com/St_alc_p1.htm
I might take you up on that if I can't figure out how to make one.
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Old 01-01-2010, 10:09 PM   #6
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If you go with a float rather than a pressure sensor, you will likely need a stainless, brass, or copper float. If you go that route, be sure to get a temperature rating. I believe that Honeywell makes stainless ones rated to 90C. I would be concerned that if you exceeded the temperature rating you could end up with some shrapnel.
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Old 01-01-2010, 10:40 PM   #7
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It will be cheaper to just go ahead and buy a switch for about $12, then fabricate a piece of cpvc or copper pipe with 1/8" female threads to attach switch. Here is a link to McMaster for a float switch http://www.mcmaster.com/#50195k93/=56uuk7. Next question is what you want to control, sparge water into MLT, HLT fill, Etc.
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Old 01-02-2010, 04:54 AM   #8
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I have this one mounted to the side of my HLT.

http://www.mcmaster.com/#46515k41/=56ztvg
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Old 01-02-2010, 06:35 AM   #9
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Originally Posted by sjlammer View Post
I have this one mounted to the side of my HLT.

http://www.mcmaster.com/#46515k41/=56ztvg
I am actually thinking of a more mechanical switch. I don't have a pump, just use water pressure. I want the water to stream to the HLT when the level drops below a certain point. And to stop flowing when it reaches a certain level. Very much like the toilet mechanism mentioned above, but I am not sure how to find one that is temperature tolerant and can be alter to fit a HLT.


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