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HotTop -- When do you drop beans in?
Barrie
Top  #26 Print Post
Posted on 10/22/2013 5:30 PM
FWIW, I have been loading the beans at 350, read from the OEM probe on the control panel readout. I recently did the rear-wall mod, adding low-reading (as it turns out) Omega probes above (Et) and below (Bt) the OEM probe. During a roast this morning beans were loaded with these temps. OEM 350, Et 361, Bt 327. I see this as an example of the fact that one needs good insight into the performance of one's own roaster and probes, but it is difficult to transfer specific temperature points for use in someone elses roaster/probe setup.
The load was of 252g SM Monkey Blend and the Bt reading at FCs was 360. Go figure?
Barrie (San Diego, CA)
"So much to learn, so little time."
Hottop 2K+., Artisan, Jura Capresso ENA 3 (i.e. espresso).
 
Randy G
Top  #27 Print Post
Posted on 10/26/2013 10:33 PM
I finally remembered this thread when I was about to roast this afternoon. I am using a HT KN-8838B-2K equipped with Greenbean's HT-RL CTRL boards (very similar in function to the HTC+TC4C). Here is what I recorded:

- - - - display BT ET
Drop 323 250 288
:30 228 162 280
1:00 200 169 278
1:30 210 187 281
2:00 230 203 286
2:30 246 217 293
3:00 214 232 299

Life's too short to drink bad coffee.
 
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Barrie
Top  #28 Print Post
Posted on 10/27/2013 1:07 AM

Quote

Randy G wrote:

I finally remembered this thread when I was about to roast this afternoon. I am using a HT KN-8838B-2K equipped with Greenbean's HT-RL CTRL boards (very similar in function to the HTC+TC4C). Here is what I recorded:

- - - - display BT ET
Drop 323 250 288
:30 228 162 280
1:00 200 169 278
1:30 210 187 281
2:00 230 203 286
2:30 246 217 293
3:00 214 232 299

Randy, approx what BT and display temps do you get at First Crack start?
Barrie (San Diego, CA)
"So much to learn, so little time."
Hottop 2K+., Artisan, Jura Capresso ENA 3 (i.e. espresso).
 
WyoRoaster
Top  #29 Print Post
Posted on 10/28/2013 9:32 AM
Randy, thanks for all the information you add to our roasting knowledge base. I'm trying to figure out your 3 minute display temp reading. Should that read 254 or 264?

Ed

Quote

Randy G wrote:

I finally remembered this thread when I was about to roast this afternoon. I am using a HT KN-8838B-2K equipped with Greenbean's HT-RL CTRL boards (very similar in function to the HTC+TC4C). Here is what I recorded:

- - - - display BT ET
Drop 323 250 288
:30 228 162 280
1:00 200 169 278
1:30 210 187 281
2:00 230 203 286
2:30 246 217 293
3:00 214 232 299
 
Randy G
Top  #30 Print Post
Posted on 11/02/2013 7:33 PM
OK - I remembered to roast, and I remembered to make some more notes to answer your questions:

260 grams

DROP
HT - 330
BT - 250
ET - 297
Time - (HT display) 21:55, or "0" on RoastLogger

[NOTE: All times from this point forward are E.T. from drop]
1st Start
HT - 383
BT - 361
ET - 380
Time - 11:04

1st End
HT - 395
BT - 374
ET - 389
Time - 11:57

2nd Start
HT - 419
BT - 397
ET - 405
Time - 14:00

EJECT
HT - 422
BT - 400
ET - 409
Time - 14:08 (+/-)

Life's too short to drink bad coffee.
 
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Barrie
Top  #31 Print Post
Posted on 11/02/2013 8:26 PM

Quote

Randy G wrote:

OK - I remembered to roast, and I remembered to make some more notes to answer your questions:

260 grams

DROP
HT - 330
BT - 250
ET - 297
Time - (HT display) 21:55, or "0" on RoastLogger

[NOTE: All times from this point forward are E.T. from drop]
1st Start
HT - 383
BT - 361
ET - 380
Time - 11:04

1st End
HT - 395
BT - 374
ET - 389
Time - 11:57

2nd Start
HT - 419
BT - 397
ET - 405
Time - 14:00

EJECT
HT - 422
BT - 400
ET - 409
Time - 14:08 (+/-)


Thanks for that additional information, Randy. I had been ruminating over what I saw as a low Bt number at first crack, but yours is about the same as mine, give or take. Further reassurance I guess. If Randy G. gets that number it must be OK. ThumbsUp
Barrie (San Diego, CA)
"So much to learn, so little time."
Hottop 2K+., Artisan, Jura Capresso ENA 3 (i.e. espresso).
 
Randy G
Top  #32 Print Post
Posted on 11/03/2013 1:22 AM
I think it depends on the thermocouples, their mass, and how well they are thermally insulated from their mounting as to how accurate the readings are. What I have found with mine is that the cracks start at the same temperature every time, +/- maybe 1 degree. And accuracy is quite unimportant, but repeatable, and thus predictable data is very important; critical, really.

Life's too short to drink bad coffee.
 
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ciel-007
Top  #33 Print Post
Posted on 11/04/2013 1:56 PM

Quote

Randy G wrote:

What I have found with mine is that the cracks start at the same temperature every time, +/- maybe 1 degree. And accuracy is quite unimportant, but repeatable, and thus predictable data is very important; critical, really.


Randy, you are right on the mark, as usual, with your informed remarks. I have come to the very same "critical" conclusion while roasting with my BMT probe.
ciel
Ciel... seeking Heaven in my cup with ................................................................................................................. EXPOBAR Brewtus II - MAZZER Mini E - MAHLK?NIG Vario - GeneCafe - RAF-1 Extreme (Modified B-2 HOTTOP) - BellaTaiwan XJ-101
 
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