Is anyone familiar with a small heater ( dime or quarter size ) that
will heat to a set point and then hold
that temp without a thermostat. I had some samples of them a few years
back but can't remember the
company that made them or what they were called.

Terry

Terry wrote:
Is anyone familiar with a small heater ( dime or quarter size ) that
will heat to a set point and then hold
that temp without a thermostat. I had some samples of them a few years
back but can't remember the
company that made them or what they were called.

Google PTC heater (Positive Temperature Coefficient)

I thought Raychem made such a thing, but I
couldn't find it. Maybe they did before the
Tyco overlords took over...

"Terry" wrote in message
om...
Is anyone familiar with a small heater ( dime or quarter size ) that
will heat to a set point and then hold
that temp without a thermostat. I had some samples of them a few years
back but can't remember the
company that made them or what they were called.

Terry
Search for 'heat trace'; these are self regulating heating elements, usually
in the form of a 2 core cable, used to protect water pipes from frost.
Martin

--
martindot herewhybrowat herentlworlddot herecom

Terry,

I developed the polymer ptc heater used in auto side mirror defrostng
heaters. There are some
patent references in my engineering link below. (click links)

I think what you are refering to though is a ceramic device commomnly used
for
motor overtemp protection and tv crt degaussing. It is about the size of a
quarter...
and costs about a quarter in large quantities. MuRata makes a lot of them.

Les Watts

http://www.lmwatts.com

"Terry" wrote in message
om...
Is anyone familiar with a small heater ( dime or quarter size ) that
will heat to a set point and then hold
that temp without a thermostat. I had some samples of them a few years
back but can't remember the
company that made them or what they were called.

Terry

On Fri, 16 Jul 2004 21:05:24 -0400, "Leslie Watts"
wrote:

Terry,

I developed the polymer ptc heater used in auto side mirror defrostng
heaters. There are some
patent references in my engineering link below. (click links)

I think what you are refering to though is a ceramic device commomnly used
for
motor overtemp protection and tv crt degaussing. It is about the size of a
quarter...
and costs about a quarter in large quantities. MuRata makes a lot of them.

Les Watts

http://www.lmwatts.com

way cool thing and with your name too!

Gunner



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Terry wrote:
Is anyone familiar with a small heater ( dime or quarter size ) that
will heat to a set point and then hold
that temp without a thermostat. I had some samples of them a few years
back but can't remember the
company that made them or what they were called.

Terry

How about Minco?

Jon