This is a re do of roast 4.
These were my measurements from the last roast:
Time Temp
0 .... 200c charge
1.30 169 TP
2 163
2.30 153
3.00 148
3.30 144
4.00 143
4.30 146
5.00 150.... end of yellowing phase
5.30 1556.00 163
6.30 170
7.00 175
7.30 179
8.00 181 ... end of browning phase
8.30 184 FC. start development phase
9.00 190
9.30 196
10.00 202
10.30 END roast temp 207C
The coffee was very light (which I like) but my original aim was to get a medium-dark roast.
So I'll up the temp targets by 20C overall and use less beans.(150g)
Target temps:
0 min Charge: 220c
3.30 160
5 min 170
8 min 191
8.30 204
10 220
end roast 230
These temps all seem very high but I suspect the bean temp is 20C cooler
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Roast 5
PNG Simbu Arabica
so there is a bit of guess work here.
The fryer only has a timer & temp control knob which is not accurate.
I was playing it constantly during the roast and reading these temps
time Old Temp New Temp
0 .... 200c charge ................ 215
1.30 169 TP ............. 191
2 163..........................................................192
2.30 153 ....................... 192
3.00 148 ........................ 184
3.30 144..........................................................182
4.00 143 ........................ 175
4.30 146 ........................ 171
5.00 end of yellowing phase 150........................................167
5.30 155 ........................ 166
6.00 163 ......................... 167
6.30 170 ........................... 173
7.00 175..........................................................179
7.30 179 ........................ 188
8.00 end of browning phase 181 198
8.30 184 FC. start development phase........ 213
9.00 190 ......................... 214
9.30 196 ........................ 209
10.00 202 ........................ 207
10.30 END roast temp 207C ......... 220
start weight 150g
end weight 132g
18g weight loss ... 12%... medium roast ?
I was happy with the final result.
This roaster is certainly not good for precision or repeatability but I enjoy a challenge.
Every roast you do will be unique.
You need to keep an eye on the temperature and adjust the temp knob up or down
to keep the temp on target.
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To do a medium roast on this machine with 150g beans my targets are:
0 min ... charge temp of 220C
1.30 aim for 150C (tipping point)
3.30 aim for 160C
5mins aim for 170C (end of yellowing phase. entering browning phase)
7mins aim for 180C
8mins aim for 200C end browning phase
9mins aim for 215C first crack ???
10 mins aim for 220C finish here. (drop)
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