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Topic: WBP1 Thermocouple Placement (6 msgs / 204 lines)
1) From: Jason Brooks
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I finally picked up a multimeter with a K type thermocouple.  Played
with it last night roasting some Colombia, Kenya and the last of a bag
of SM Classic Espresso Blend.  What I noticed as I went through the
three roasts was that as the beans expanded and lightened, they pushed
the thermocouple up the roast chamber.  For instance, the SM CEB was
targeted for about 450.  As I watched the roast and listened, I noticed
that the temp was staying around 430, but audibly was much further
along.  I pushed the thermocouple down and had my target temp.
Suggestions on placing/inserting the thermocouple on a poppery?
Thanks,
Jason
- --
Jason Brooks
jbrookshttp://javajeb.wordpress.com- -------------------------------
Enjoying good coffee in the Heart of Virginia
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2) From: Kevin Creason
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3) From: Michael Dhabolt
Kevins recommendation works for me.  The P1 has a 3" inside diameter
so I placed my TC (the end of the probe) into the chamber center - -
1.5" from the sides and 1.5" up from the bottom. Some pics and other
info is at:http://homeroasters.org/php/forum/viewthread.php?thread_id'0Mike (just plain)
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4) From: Andy Thomas
I drilled a hole diagonally through the outer plastic housing, through the =
Bakelite part of the chamber and poked the TC bead in so it is at Top Dead =
Center when the popper is loaded with about 150g green beans. It is held in=
 place with masking tape. Not permanent, but I never have to remove it. As =
the roast progresses and the beans expand, the bead becomes immersed in the=
 fluidized bean mass. Sometimes the wire moves if I stir the beans, but I j=
ust poke it back into position.
From: Kevin Creason 
To: homeroast
Sent: Saturday, January 3, 2009 1:37:17 PM
Subject: Re: [Homeroast] WBP1 Thermocouple Placement
Drill a hole and permanently mount it. I did that with a couple of candy th=
ermometers.

5) From: peterz
I got a length of very small diameter copper tubing from the hardware 
store. The TC just fits down through it, and the end of the TC just 
pokes out of the copper.
Now I can hold the TC in place wherever I want it down through the top. 
Bend the tubing and hang it where you finally decide.
If you want to use stainless steel... saw the shaft off of a turkey 
frier thermometer, (it is about a foot long  and only a few bucks;) 
pulled the thermometer stuff out of it leaving a hollow SS tube.
If you cut the tip of the pointed end off, you get quicker response time.
Using this method, and moving the TC around during the roast, you get to 
see some major temperature variations within the bean mass.
Placement is very important, as the air coming into the chamber is much 
hotter than the beans themselves. I saw up to 1000F.
YMMV.
PeterZ
Still freezing in LHC.
Andy Thomas wrote:
<Snip>
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6) From: raymanowen
If the thermocouple moves at all, the reading will always change- just like
a coffee bean in a roaster or drum, and for the same reason. -ro
On Sat, Jan 3, 2009 at 2:04 PM, Jason Brooks  wrote:
<Snip>
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976
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