Roasting Glossary of Terms and Acronyms

[farmroast]

ACRONYMS:

• BT--Bean Temperature: as measured by thermocouple or thermometer in the bean mass.
  
  ET--Environmental Temperature: The environmental/air temperature in or around the roast chamber that relates to the average temperature the beans are being exposed to at a particular point in the roast.
  
  MET--Maximum Environmental Temperature: The maximum environmental temperature the beans are exposed to in the roast environment. Can also refer to the maximum ET the beans are exposed to during the roast.
  
  RoR-- Rate of Rise of BT degrees(C or F) rise/time(usually per minute)
  
  RoC-- Rate of Change of ET, positive or negative.
  
  TC--Thermocouple: A digital thermometer with a wire and probe or wire that is bare at the end with a bead tip or wrapped.
  
  TC4-- A Arduino based roast monitoring and controlling device developed by the homeroasting community TC4

WP-- Wet processed coffee

DP-- Dry processed coffee

TERMS:

• Drop temperature: The ET at the time the beans enter the roaster.
  
  Turnaround Temperature: The BT reading at the point after the beans are dropped when the BT reading begins to increase/turnaround after dropping from the preheat temp.
  
  Dump: The point when the roast ends.
  
  Warming Phase: The initial phase of heat being applied to the beans.
  
  Drying Phase/Stage: The first part of the roast where the beans are dried to the proper level.
  
  Ramp Phase/Stage : The phase/stage after the drying up to 1st crack where the heat applied is generally increased. Maillard reactions are occurring and then sugars.
  
  First Crack: A popping sound similar to popcorn where moisture is released
  
  Second Crack: A snapping sound similar to rice krispies where co2 is released
  
  Conduction: Heat applied by direct contact
  
  Convection: Heat applied by air
  
  Radiant: Heat applied by radiance off of a surface, heating element, infra red heat
  
  Exothermic: Where the beans are releasing heat energy
  
  Endothermic: Where the beans are absorbing heat energy

[another_jim]

Thanks

[arriflex]

It may be time to add:

ROR -- Rate of Rise: The velocity of Bean Temperature measured as degrees (C or F) per time division (usually one minute) More info here: Any way to have a meter display of the degrees rise/ min. rate?

[drgary]

You might want to add BMP = Bean Mass Probe.

[mcwresearch]

I've seen "charge" and "drop" used interchangeably and I've also seen "drop" and "eject" used interchangeably.

Can anyone speak with authority on the correct usage of "drop" (if there is a "correct" usage)?