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    Event checkpoints: Charge temperature Turning point:point of equilibrium between the beans and the drum ( or probe) timing of color change: green to yellow, yellow to bread, bread to first crack first crack: time and temperature Time of first crack to end roast - development phase (second crack) roast process phase: prep: setting the base for overall momentum of roast. 0 - 6 min maillard reaction: body and sweetness. min 2 minutes from yellow to bread. acids and overall end flavours: time after FC to achieve the desired end flavour roastress coops article online

    owner's manual service manual illustrated parts breakdown Coffee time wiki jong ken on heater wire replacement  coffeeclub99 heater mod to 1850W and repair blogs and ruten artisan software Automation mod from N Sager (aka Brewtal) this one from Evan Graham (aka evquink) and roasthacker : bean mass probe bracket on thingiverse evquink's github on bean mass probe v2   wifi temperature broadcast RaspberryPi mod from r0bin about temperature readings on HB :   unconfirmed. the thermal sensor on the heater box side is the feedback probe for controlling the temp you set. The temp read ( on the LED display) is from the exit side probe. The air temp entering the roasting chamber would then be limited to the 250 deg c max.  Remember this unit is reading air temp. Not bean temperature.  The heater side sensor seems to be type k embedded in hex screw, whereas on exhaust side, seems to be type k with metal sheath

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