Simple thermostatic switch?

D

DaveC

Guest
Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
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Please reply in the news group
 
On Wed, 29 Sep 2004 11:02:17 -0700, DaveC <me@privacy.net> wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.
Click to expand...
---
http://www.ti.com/snc/about/klixon.htm

--
John Fields
 
On Wed, 29 Sep 2004 14:52:35 -0700, Jamie wrote
(in article <10llvj436c0k8a2@corp.supernews.com>):

http://www.controlsupply.com/itm00031.htm
Click to expand...
Thanks for the reference, Jamie.

But that's a bit of overkill (and over-priced) for my needs.,

No adjustment needed, low voltage is fine.

I've seen switches about the size of a few dimes' thickness that bolt to
audio amplifier heat sink. These, of course, would be too high-temp for my
application, but where can I find similar switches?

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
me@privacy.net wrote:

}Just a simple bi-metallic would do. Need to keep a box full of electronics
}warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
}
}Open when warm, closed when cold, of course. Current capability not
}important; can use relay to handle load.

Do you mean like a simple furnace thermostat available from any
home improvement store?

Stan.
 
On Wed, 29 Sep 2004 11:02:17 -0700, DaveC <me@privacy.net> wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.
Click to expand...
---
Try this:

http://www.google.com/search?hl=en&ie=UTF-8&q=low-cost+bimetallic+thermostat+switch


--
John Fields
 
On Wed, 29 Sep 2004 11:58:44 -0700, Stan wrote
(in article <stanleyh-2909041158450001@pdx-ppp110.pop1.net>):

Do you mean like a simple furnace thermostat available from any
home improvement store?
Click to expand...
No, Just a nickel-sized snap switch. like these:

http://www.ti.com/snc/products/controls/ptherm-7bt2.htm

Thanks, John F !!
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
http://www.controlsupply.com/itm00031.htm


DaveC wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
Click to expand...
 
On Wed, 29 Sep 2004 11:50:49 -0700 DaveC <me@privacy.net> wrote:

I've seen switches about the size of a few dimes' thickness that bolt to
audio amplifier heat sink. These, of course, would be too high-temp for my
application, but where can I find similar switches?
Click to expand...
Klixon

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------
 
Why not go to the hardware store, and buy a simple thermostat? Connect
it through a heavy duty relay, and run whatever heating system you want.

--

Jerry G.
======

"DaveC" <me@privacy.net> wrote in message
news:0001HW.BD8046B9000A4D8BF02845B0@news.individual.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
"DaveC" <me@privacy.net> wrote in message
news:0001HW.BD8046B9000A4D8BF02845B0@news.individual.net...
Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
Click to expand...
Take a look at the thermostats used on hot water tanks.
 
Digikey sells just what you want. They are made by Cantherm. Any temperature
you want in 5 degree steps.


"DaveC" <me@privacy.net> wrote in message
news:0001HW.BD8046B9000A4D8BF02845B0@news.individual.net...
Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
Click to expand...
 
Stan wrote:
me@privacy.net wrote:

}Just a simple bi-metallic would do. Need to keep a box full of electronics
}warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
}
}Open when warm, closed when cold, of course. Current capability not
}important; can use relay to handle load.

Do you mean like a simple furnace thermostat available from any
home improvement store?

Stan.
Click to expand...
I don't know how common they are, but here in Austin, Texas we have
a couple of Habitat for Humanity stores that sell surplus/used/donated
stuff they don't need for their own construction projects. That would
probably be a great source for something like the OP is looking for.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.
 
On Wed, 29 Sep 2004 11:02:17 -0700, DaveC <me@privacy.net> wrote:

Just a simple bi-metallic would do. Need to keep a box full of electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70 deg.
Click to expand...
A bimetallic strip is usually welded, but I've heard that rivets, screws, and
even some kinds of adhesive work. You might just build one from two different
metal sheets.

One supplier I googled:
http://www.ltv-copperweld.com/

Also, there was this interesting page area:
http://www.aspire.cs.uah.edu/aspire/gk12/work/BMS_Model.html
http://www.aspire.cs.uah.edu/aspire/gk12/work/BMS_Home.html

Coiled bimetallic strips are compact and sensitive and used in some furnace
controls. You could consider dismantling one of those. Call a furnace repair
outfit for a "broken" one? I wonder about the automotive thermal controls used
to block or pass radiator water -- those should be dirt cheap and widely
available and you may be able to mechanically arrange to use the innards.

I also read that adding a pressed dimple into the strip produces snap action
with hysteresis. Hadn't thought of that, but it sounds intriguing to play with.
The furnace controls I've looked at use a mercury switch that tips one way or
the other on the coiled bimetallic and, because of the weight shift, they have
that hysteresis.

Best of luck,
Jon
 
DaveC <me@privacy.net> writes:

On Wed, 29 Sep 2004 14:52:35 -0700, Jamie wrote
(in article <10llvj436c0k8a2@corp.supernews.com>):

http://www.controlsupply.com/itm00031.htm

Thanks for the reference, Jamie.

But that's a bit of overkill (and over-priced) for my needs.,

No adjustment needed, low voltage is fine.

I've seen switches about the size of a few dimes' thickness that bolt to
audio amplifier heat sink. These, of course, would be too high-temp for my
application, but where can I find similar switches?
Click to expand...
Just about any thermostat from a furnace, A/C, oven, etc., can be recalibrated
to be wihtin the range you want.

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Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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Important: Anything sent to the email address in the message header is ignored.
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"DaveC" <me@privacy.net> wrote in message
news:0001HW.BD8046B9000A4D8BF02845B0@news.individual.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70
deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.
Click to expand...
I really have no respect for someone who says that. I've googled
extensively for some sought-after advice, and someone has then given me
a google URL that I had missed altogether. And that made me go
"ah-HAH!" and from this experience I was blessed with much wisdom. So
my advice is if you want to keep on the good side of the news group
gurus, don't belittle them for any advice you might receive, no matter
how trivial. They mean to be helpful.

Buy a thermostat from Home Depot?

DaveC
me@privacy.net
Click to expand...
 
"Watson A.Name - \"Watt Sun, the Dark Remover\"" <NOSPAM@dslextreme.com> wrote in message news:<10lmt2q4c7h9ucd@corp.supernews.com>...
"DaveC" <me@privacy.net> wrote in message
news:0001HW.BD8046B9000A4D8BF02845B0@news.individual.net...
Just a simple bi-metallic would do. Need to keep a box full of
electronics
warm during winter. Threshold spec can be anywhere from 30 deg - 70
deg.

Open when warm, closed when cold, of course. Current capability not
important; can use relay to handle load.

All the google results I find are all HVSC related, none helpful.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

I really have no respect for someone who says that. I've googled
extensively for some sought-after advice, and someone has then given me
Click to expand...






a google URL that I had missed altogether. And that made me go
"ah-HAH!" and from this experience I was blessed with much wisdom. So
my advice is if you want to keep on the good side of the news group
gurus, don't belittle them for any advice you might receive, no matter
how trivial. They mean to be helpful.

Buy a thermostat from Home Depot?

DaveC
me@privacy.net
Click to expand...



I would use a 40W bulb in series with a simple home thermostat ($10).
Click to expand...
Jacques
 
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