HomeRoast Digest


Topic: Blue plastic on thermometer melts (14 msgs / 448 lines)
1) From: Brian Kamnetz
Hi,
I tried to search for  this in "http://themeyers.org/HomeRoast/".The
search came up with threads, but the threads wouldn't open.
A couple years ago I got a digital thermometer from SM, and used it
for the first time today. The probe had a blue end about 3/4 inch
long. I roast with a heatgun, and put the beans in a colander that I
place in a stainless steel bowl. I threaded the blue plastic end of
the sensor into the colander and roasted a pound of Jimma. When the
roast ended the blue end was melted.
What should I do next?
Thanks for any help.
Brian
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2) From: miKe mcKoffee
Compare the taste of Jimma with and without a blue plastic shell.
:)
miKe 
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3) From: John A C Despres
It looks like heat shrink to me... Did it melt into your beans at all? Or
just change shape and get a bit gooey?
John
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4) From: Joseph Robertson
Brian, This message is more for Tom and or his list manager, It appears as
though the first 15 threads open but none below that.
As to your melted blue end. Now that the plastic is melted off does it still
read and pick up the temp?
Joe
On Sat, Mar 5, 2011 at 1:17 PM, John A C Despres wrote:
<Snip>
-- 
Joseph Robertson
Sasquatch Coffee Roasters
Craft Coffee Roasting by Design
joe http://www.jolindas.com(360)521-3104     PO Box 451 Stevenson,Washington 98648 USA
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5) From: Brian Kamnetz
John, the blue material originally covered the end 3/4 inch or so. Now
the end is mostly bare up to the glass. It's hard to tell whether it
simply shriveled up or whether it went into the beans; none is visible
on the beans.
Brian
On Sat, Mar 5, 2011 at 4:17 PM, John A C Despres  wrote:
<Snip>
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6) From: Tom & Maria - Sweet Maria's Coffee
I am confused because all the thermocouples I have used from out 
stock (quite a few) have bare ends and then woven fiberglass (or 
frankly, I am not sure what the material is exactly) that has proved 
very heat resistant. I don't remember seeing plastic on the sensor 
end. Am I confused?
Tom
PS- Off to Guatemala in a couple hours so might not see replies for a bit.
<Snip>
-- 
-Tom
Sweet Maria's Coffee  -  Oakland, California  - http://www.sweetmarias.comHomeroast mailing list
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7) From: Coffee
Tom, I think the thing he is talking about is the end of the TC that 
came with the electronic thermometer you sold 2-3 years ago.  I also 
ruined a couple of roasts by not knowing to remove it before use, and 
think I even said something on the list about it.  It was a blue plastic 
(?) sleeve that was not heat resistant to the temps we roast at.  New 
TC's purchased from Omega did not have it.  I have not purchased another 
thermometer, because the one I originally bought still works fine, so I 
do not know if that is still the case or not.
The original Thermometer I bought through SM was a CircuitSolutions.com 
K-Type MS6500.
Hope that clears up the confusion. :)
Best Regards,
Ken B
On 3/12/2011 10:00 AM, Tom & Maria - Sweet Maria's Coffee wrote:
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8) From: Brian Kamnetz
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9) From: Coffee
Brian,
I actually think that the plastic is heat resistant for 'normal' temps 
like boiling or whatever, but at the 400 degree plus stage, you get 
'blue beans'.  (ok, all you folks get your minds out of the gutters) ;)
And yes, I carefully scraped the rest of the blue plastic off and 
continued to use the TC.  Be sure not to cut into the insulation as you 
clean it up.  You can get replacement K Type TCs at http://www.omega.com/pptst/5TC.htmland I use the 5TC-TT-K-30-36 with a 
max temp of 500f for use in my iRoasts.  They work just fine, with no 
melting. :)
Best Regards,
Ken B
On 3/12/2011 2:58 PM, Brian Kamnetz wrote:
<Snip>
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10) From: Dean
While I don't >personally< have any concerns with PTFE (Teflon) family 
at roasting temps (some have expressed these in the past), I would 
probably stay with the Glass/Glass wires.  If size is not a problem 
and stiffness is an advantage, get a probe with a stainless sheath.  
then no insulation in the beans.  Maybe a little less responsive, but 
repeatable.  Google found me some in the past.  Omega can be kinda 
high-end......
Dean
In da weeds.  (and the mud......)
On 3/12/2011 4:30 PM, Coffee wrote:
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11) From: Rich
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12) From: Coffee
Actually, I was less concerned about the Teflon that ingesting 
micro-shards of fiberglass. :)  But each thing has it's own issues, so I 
guess it is up to the user.  I liked the teflon ones because they do not 
fray when the lid of the iRoast is closed on them and they are stiff and 
stay in place.
Ken B
On 3/12/2011 5:48 PM, Dean wrote:
<Snip>
Homeroast mailing list
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13) From: raymanowen
"...[with] the plastic melted off does it still read and pick up the
temp?"    Yes, better.
I watched the plastic sleeve start to melt and wither away long before it
got up to any useful roasting temperature. Its purpose must be to cause
folks to wonder "Why?" The thermocouple is absolutely independent of
anything but the junction between the Chromel and Alumel wires, so lose the
blue sleeve.
If the actual TIG-welded blob comes off at the end of the wires, you can
just cut and strip the two wires, twist them together and you have a brand
new junction. (Don't worry, your pet alligator will have caused other
problems before he bites the end off!) Very sensitive with nearly Zero mass
is the twisted junction. Propane torch is not hot enough to weld the wires,
but an oxy-mapp gas flame can do it if you set the flame to neutral, so as
not to poison the junction. Met 101.
Cheers -RayO, aka Opa!
On Sat, Mar 5, 2011 at 5:30 PM, Joseph Robertson wrote:
<Snip>
-- 
Persist in old ways; expect new results - suborn Insanity...
Homeroast mailing list
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14) From: Joseph Robertson
RayO,
As a former wedding student and "Certified College degreed Welder" for what
ever that is, I can fully enjoy your synopsis / post. I just lost a tip and
had to do exactly what you described. Reads just fine now.
JoeR
PS. all truth be known public.......my only issue came when tech support,
suggested I hammer out the probe from the face of my Probat. Being a former
welding student I became very good with a big hammer. So good that I ruined
/ bent the tip of the probe.
My pilot friend came by who has way better eyes than me and said do you have
a pair of pliers? He then proceeded to unscrew the probe from the face of
the roaster. From that point on the repair of the "spare" 1/2" of the tip
was a simple procedure.
Brings back memories of the Monkey and the typewriter or chewing threw the
leather straps in the morning being worth it or not.n
JoeR
<];^0
On Sun, Mar 13, 2011 at 12:41 AM,  wrote:
<Snip>
-- 
Joseph Robertson
Sasquatch Coffee Roasters
Craft Coffee Roasting by Design
joe http://www.jolindas.com(360)521-3104     PO Box 451 Stevenson,Washington 98648 USA
Homeroast mailing list
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