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Relative air temp vs. bean temp.
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MikeSD
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Joined: 10 Jan 2013
Posts: 53
Location: Florida
Expertise: I like coffee

Espresso: De'Longhi EC155
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Roaster: Homemade SC/CO
Posted Tue Mar 5, 2013, 10:37am
Subject: Relative air temp vs. bean temp.
 

I am looking for advice.  I recently put together SC/CO roaster.  It works pretty well, but I want to install a thermometer.  I wanted to know what kind of air temp I am looking for inside the roaster.  Also, is there a discernable difference between the air temp and the temp of the beans? Now that I think of it, does that even matter?  With my previous set up I was using an air popper and the thermometer was placed directly into the beans.
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oldgearhead
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oldgearhead
Joined: 25 Jan 2010
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Grinder: Virtuoso by Baratza
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Posted Wed Mar 6, 2013, 6:33am
Subject: Re: Relative air temp vs. bean temp.
 

Michael Sivetz published a lot of data in the 1960's about commercial coffee processing. In his 1963 work, he stated the best temperature for the hot air in a
'continuous' roaster is 450F to 500F. In general, for home roasting, a 'bean-mass-temperature' probe is desired, because a lot of data has been recorded with them. However, if you can hear the cracks and know how to respond to them, a BMT may not be absolutely necessary.
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MikeSD
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Joined: 10 Jan 2013
Posts: 53
Location: Florida
Expertise: I like coffee

Espresso: De'Longhi EC155
Grinder: Hario Skerton, Baratza...
Vac Pot: Yama Stovetop 8 Cup
Drip: Hario Pourover
Roaster: Homemade SC/CO
Posted Wed Mar 6, 2013, 2:27pm
Subject: Re: Relative air temp vs. bean temp.
 

I basically drilled a hole into the spacer and put candy thermometer through.  I guess it will be a bit of trial and error before I get it dialed in.
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Prof
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Prof
Joined: 10 Sep 2004
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Espresso: PV Lusso
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Roaster: Behmor 1600+
Posted Wed Mar 6, 2013, 6:03pm
Subject: Re: Relative air temp vs. bean temp.
 

MikeSD Said:

I basically drilled a hole into the spacer and put candy thermometer through.  I guess it will be a bit of trial and error before I get it dialed in.

Posted March 6, 2013 link

Take good notes and in little time you will know what indicated temps on your candy thermometer give you your favorite roasts.

 
LMWDP # 010
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aghaken
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aghaken
Joined: 14 Sep 2012
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Location: Saugerties
Expertise: I like coffee

Posted Fri Mar 8, 2013, 7:43pm
Subject: Re: Relative air temp vs. bean temp.
 

Initially I drilled a hole through the side of the SC and put the thermocouple wire in through that.  But it was just measuring the air temp, which didn't tell me much about the beans. So I drilled a hole in the bottom of my SC, brought the thermocouple wire in through the door on the bottom and just bent the end over.  It sits in the bean mass and as far as I can tell gives me pretty accurate readings.  Of the mass obviously, not the internal temperature. (First crack is around 380 - 385.) I use temperature mostly as a guide. Some beans will be FC at 415, some will be darker. I rely more on sight and sound.

http://www20.pair.com/hifi/SCTO-02.jpg

http://www20.pair.com/hifi/SCTO-01.jpg
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