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'[EE]: simple temp switch'
2002\09\17@141630 by Micro Eng

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I'm looking for a simple, non powered temp sensor that when it reaches a
certain temp, it closes a relay. Similar to like a thermostat, but I need
somethig a little more elegant if possible.  I just want to trip an alarm
(clse a relay) if the temp reaches a certain point

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2002\09\17@145630 by Mike Singer

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Micro Eng wrote:
> I'm looking for a simple, non powered temp sensor
> that when it reaches a certain temp, it closes a relay.
> Similar to like a thermostat, but I need somethig
> a little more elegant if possible

Microchip temperature sensors (powered):

TC07 Dual output, programmable hysteresis output
+2. 7v to +5.5v   0.3 ma

TC623 Dual trip points, programmable hysteresis output
+2. 7v to +4.5v   0.25 ma

Mike.

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2002\09\17@151921 by stuart

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Go low tech with a bimetalic strip.

Unpowered, and convieniently enough incorporates the relay.  Do a Google search for
Bimet - its the company name of a maker.

9/17/2002 11:14:35, Micro Eng <micro_engspamKILLspamHOTMAIL.COM> wrote:

>I'm looking for a simple, non powered temp sensor that when it reaches a
>certain temp, it closes a relay.

Stuart Ramsay
Project Engineer
V 714-542-0608
F 530-678-6328
.....stuartKILLspamspam.....ultratecusa.com
http://www.ultratecusa.com

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2002\09\18@044347 by Alan B. Pearce

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>I'm looking for a simple, non powered temp sensor that when it reaches a
>certain temp, it closes a relay. Similar to like a thermostat, but I need
>somethig a little more elegant if possible.  I just want to trip an alarm
>(clse a relay) if the temp reaches a certain point

Go looking for a bimetal thermostat of the kind used in home heating. This
will come with a roughly calibrated temperature scale as well.

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2002\09\18@051116 by Roman Black

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Alan B. Pearce wrote:
>
> >I'm looking for a simple, non powered temp sensor that when it reaches a
> >certain temp, it closes a relay.
>
> Go looking for a bimetal thermostat of the kind used in home heating. This
> will come with a roughly calibrated temperature scale as well.


There are a number of manufacturers now producing
nice thermo-mechanical switches in the "transistor"
TO220 package. These are available in decent current
sizes and N/O and N/C contact types, and you may not
even need the relay. :o)
-Roman

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2002\09\18@142458 by Peter L. Peres

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On Wed, 18 Sep 2002, Roman Black wrote:

*>There are a number of manufacturers now producing
*>nice thermo-mechanical switches in the "transistor"
*>TO220 package. These are available in decent current
*>sizes and N/O and N/C contact types, and you may not
*>even need the relay. :o)

Photo or type please ? Specs ? price ?

tia,

Peter

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2002\09\18@144240 by Roman Black

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Peter L. Peres wrote:
>
> On Wed, 18 Sep 2002, Roman Black wrote:
>
> *>There are a number of manufacturers now producing
> *>nice thermo-mechanical switches in the "transistor"
> *>TO220 package. These are available in decent current
> *>sizes and N/O and N/C contact types, and you may not
> *>even need the relay. :o)
>
> Photo or type please ? Specs ? price ?


Hi Peter, a quick google for "TO220 thermostat"
revealed a number of manufacturer catalogue pdfs and this:
http://www.willburger.de/surface.htm
:o)
-Roman

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