Trier Bean Temp Probe for the FZ94 roaster

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The standard Bean Temp probe in the CoffeeTech FZ-94 works well enough but the spot where it is inserted does not allow it to get very deep into the coffee mass that's rolling around in the drum. If I insert the probe a little deeper, sooner or later a bean gets stuck between a drum blade and the tip of the probe and the probe is pushed out a little, causing it to report a lower temperature than before in the same situation.

First Crack typically happens around a measured BT of 160ºC which indicates that at this spot the BT probe has an offset of 40ºC since FC mostly happens around 200ºC.

I noticed how the trier seems to get much deeper into the drum which could mean that this spot could be great for BT measurements as well.

Tije made me an alternative Bean Temp probe device.  It replaces the standard trier but I can get the visuals through the glass and the aroma comes to me from a little hole in the tube above the chaff collector.

The probe was custom made by TC Direct. Bart Gommers, sales consultant there, suggested me to order one with these specs and I did:
Thermokoppel K - L=120MM Dia: 3.0 - Geïsoleerd meetpunt - Overgangshuls: L=31MM Dia: 6.1 - 2Mtr PVC aansluitkabel

Tije taking the size of the new probe
Almost finished. An temp isolated kernel inside the aluminum.
Handle of the same style as the existing FZ-94 handles
Insert and probe
Two tiny rubber rings ensure that the probe sits firmly once the handle is screwed in tight

Original trier and probe replacement
Ready to go
More:

http://kostverlorenvaart.blogspot.nl/2016/11/fz-94-roast-with-tijes-new-trier-bt.html

PS 9 Feb 2017:

Tije installed a switch that allows me to choose what probe is used to measure Beans Temp, the high one in the "trier" location or the lower one next to the looking glass. The lower one might work best when roasting small batches.



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