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Topic: Digital thermometer question (2 msgs / 49 lines)
1) From: Randy Roy
I just received one of these digital thermocouple thermometers.  What's the
best way of attaching/mounting the probe in a roaster like a Rosto or a FR+?
Thanks,
Randy
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2) From: dewardh
Randy:
<Snip>
or a FR+?
That's one of those *really* open ended questions  . . . there are just a 
lot of "it depends"es.  How willing are you to carve up your roaster, and do 
you want to measure roast air temp or bean temp?  The little "bead" probe which 
comes with the digital thermometer is best for measuring air . . . I have one 
clipped  under the dome of a Rosto, where it measures air temp going into the 
roast chamber (cut the shrink-wrap off).  For measuring bean temperature a 
rigid probe works better, both because it's more reliable (the moving beans 
will eventually break a wire probe) and because the greater contact surface 
insures that at least part of the probe is in actual contact with beans, not 
the air around the beans, so you get a more reliable reading. If you don't want 
to buy a Stainless Steel probe you can make one by crimping off one end of a 
piece of 1/8 or 3/16 thinwall tubing (after filling the to-be-crimped end with 
heat sink compound, it's easier if you put the compound in while the tube is 
still open) and then inserting the wire probe into the tube until it reaches 
the end (where it will be immersed in the heat sink goo).  My "bean probe" is 
mounted so the tip is about midway between the floor of the (Rosto) roast 
chamber and the lip of the dome (vertically) and about 2/3-3/4 of the way from 
the dome to the outside wall.  It's not close enough to any surface to "jam" 
the beans, but is as far from the hot air ports as practical.  The wires and 
probe are brought out through the "front" of the roaster (through the brown 
phenolic housing).  The entry hole for the bean probe is drilled in the metal 
wall of the roast chamber.  I also bring out the heater leads separate from the 
fan, so the fan runs at full speed regardless of heater input (roast air 
temperature).
I've long since waived the warranty  . . .
Deward
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