
Zitat von
egodoc
Hallo UWE!
Nein, ich bin nicht sicher! Es ist die gemessene Temperatur am Blech unter der Trommel, da ist noch mal Luft dazwischen.
Wahrscheinlich wird die Trommeltemperatur niedriger sein.
Aber ich kann mich an dieser Messung in der Trocknungsphase, wo viel Hitze gefragt ist, orientieren.
Es geht darum Verbrennungen zu vermeiden und trotzdem schnell zu sein in dieser Phase.
Offenbar ist es ein verbreiteter Irrtum, dass tipping und scorching hsl. in der Trocknungsphase entstünde.
Jim Schulman erwähnt diese hohen Temperaturen auch - er misst die Luft, bevor sie in das Trommelinnere eintritt:
Ich zitiere ihn hier:
I use a Quest M3 for sample roasting and and for espresso. It behaves best when used according to the standard recommendations for Probat shop roasters, since the design principle is the same. If I am not mistaken, the Huky is also built along these lines -- solid drum ventilated with air that has passed over the heat source, in order to produce a convection roast. These recommendations are to keep sample roasts around 10 minutes, and production roasts around 12. These roast lengths divide into three equal time segments, the first from the drop in to the point the beans have dried and go yellow (the average bean probes will measure 155C). The second segment runs from here to just ahead of the first crack (average probe reads 190C, with the first crack starting at 195C). The final segment runs till the end of the roast (205C to 230C, depending on how dark you go)
Prior to the fist crack, the beans are moist and resist scorching. So the drum temperature is not critical. As the first crack starts, you will want to limit the drum to 275C for high grown beans, and 255C for low grown. These measures are based on thermometers in the air intake at the rear of Probat shop roasters. On the Quest, I measure mine on the outside of the drum, in the heated airflow, and get about the same readings. I do not know where the best spot is on Huky, but I'm sure the topics I listed will.
In any case, the trick is to increase the airflow to the maximum, and cut the heat to a minimum, at the start of the third roast segment, just ahead of the first crack. This flushes the stored heat from the rear of the drum towards the beans. Once the drum temperature is in range, you can cut the air and raise the heat until the end the roast. This is the standard operating procedure used by every roaster I've ever talked to. Most of them pick a bean weight that will get the timing right, and keep the the drum temperature in the right range for the actual roast control.
Hope this helps,
Jim
Ich kann nur sagen, bei mir haben diese Ratschlage geholfen!
Liebe Grüße
Erhard
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