[Homeroast] heat gun method

Bill S. wsmailmagnet at gmail.com
Tue Nov 30 15:22:13 CST 2010


Allon,
Agreed and thanks..
BillS

On Wed, Nov 24, 2010 at 9:11 PM, Allon Stern <allon at radioactive.org> wrote:

>
> On Nov 24, 2010, at 2:30 PM, Bill S. wrote:
>
> > The S.M. digital thermometer probe that I use came with a bare bulb
> attached
> > to high-temperature wire.  I epoxied this inside an empty stainless steel
> > ball point pen refill, with both ends off.  When mounted with a rigid
> > fitting inside the roaster, this remains in the center of the bean mass,
> and
> > the SS probably provides some temperature stability giving constant
> > readings.
>
> It's a tradeoff; any thermal mass added to the junction will slow the
> response. A bare thermocouple reacts very quickly. But once your roast is
> going, even if you're a couple seconds behind, it'll probably be good 'nuff.
> That's part of what the PID algorithm smooths out for you.
> You can get thermocouple probes in stainless housings with threaded
> fittings off the shelf; a bit pricier, but more durable than the bare wire.
>
> -
> allon
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