Thread subject: Homeroasters.org :: CoffeeAir II Roaster Build
Posted by seedlings on 09/09/2010 13:29
The first PID roast was ... <drumroll> ... 'completed'.
The temperature showing on the PID from the bare TC shown above 'stalled out' in the 340s. However, this was not accurate because the other TC I threw in the top topped out at 487F with beans. Roasted 1.25# of Robusta into the snaps of second crack in 14 minutes. First crack came about 10:00. I switched the heat off and turned the fan up and the temp came down to 150 in a minute or so, but the steel hopper was still very hot. I used an oven mitt to dump the beans to my cooler, but the beans were just barely warm to the touch.
I had the PID set to:
Ramp to 325F in 3 minutes
____hold 325F for 1 minute
ramp to 440F in 3 minutes
____hold 440F for 1 minute
ramp to 460F in 3 minutes
____hold 460F for 3 minutes
ramp to 50F in 0.0 minutes
____hold 50F for 3 minutes
The first ramp to 325F went perfect, but since the temp never rose above ~345F, none of the other ramp/soak points really mattered.