Here it is, the US Sample Roaster.
Note that these pics were taken after roasting, so the tryer is laying in the dump tray...
The temperature controller is a Watlow PID but it is set to signal only ON/OFF, and mainly used as a temperature readout off of the probe in the bean mass (directly under the sightglass). Temperature ramping is controlled manually by means of a precise needle valve on the gas feed to the burner.
Behind the Temp Controller/Display is the fan speed control pot, allowing for variable airflow
That wire running across the unit is from my clamp-on light...not very elegant (yet) but I wanted a clean light shining in the tryer so I can have some consistency when checking beans during the roast
I'm still learning to manage the roasts and control the progression, but early results are very encouraging. This machine seems to be well built and is a pleasure to use, and the people in OKC were just terrific to deal with. I'm glad I decided to purchase locally to support domestic industry
And of course it's nice to have a direct line to the manufacturer.....