Duplex K-type thermocouple for coffee roast control & monitoring

-
My Fracino Roastilino has two metal tubes into the roasting jug so I can insert the probe from the PID temperature controller plus a probe for the Amprobe logger to track and log the roast with the free-for-all Artisan software.

Of course one wants both probes to agree on the temperature even though they are inserted in two different spots. I found a way for them to agree by insering one a little more than the other, but sometimes one or the other probe would move a little and there would be a discrepancy of up to 10ºC.

Now, the people at TC Direct made me a duplex thermocouple in a single probe so both are feeling the temperature in the same spot.

I have tested the setup and around 20ºC they disagree about 2-3ºC but as the temperature rises they agree more and they are practically identical above 200ºC which is just fine. I can tweak the offset of one probe in the PID settings a little but that's not necessary.

Here is a short series of pictures documenting the modification:


Fresh from the unboxing



2x2 wires from the one probe
The probe with 2 TC's inside

Everyone wondering what color is + or - on this type probe, check their mug!

Connecting the wires to the plug for Amprobe

Previous setup with to probes

New situation: one dual probe


Connection points on the PID inside the roaster
Probe: green and white wires in the center

Testing: works! 

Reacties

Een reactie posten

Populaire posts van deze blog

Finished Pavoni & Fuji PXG4 pid: Probe Inside the Ring

-
Afbeelding
Delicious cup: all the work was well invested! At the end of the previous blog about the pressostat and PID working together , I mentioned that I would like to clean up the xmas tree of wires and have as few cables and probes as possible to visually disturb the classic design of the La Pavoni. Getting rid of the probe that was fastened with copper tape to the top of the brew group was a priority. I wanted to hide a new probe in the cooling fin as close as possible to the brew group. This morning I asked Tije if he could do that. He would need to drill a straight hole of 3mm diameter in the 4mm inner ring of the cooling fin that sits as a tight clamp around the brew group. Always the optimist, Tije set to work: First, Tije made a piece of aluminum to fit the inside of the ring. Drilling a thin hole straight through the curved aluminum, if possible tangentially going through the inside of the ring to touch the brew head directly, you need the support of the temporary insid...
Meer lezen

KiwiSDR2 [radio]

-
Afbeelding
  Despite selling one and giving away two of the five monster vintage 'boat anchor' receivers that I had, I still enjoy listening to shartwave radio. The modern iCOM R8600 that I also have has a wider range plus some decoding options but it's not easy to figure out what encoding is used on which frequencies. The SDR-Control app from Marcus Roskosch at https://ham-radio-apps.com/ makes this much easier and also allows some remote control of the receiver so you can place it and an antenna at the top floor of your house while listening downstairs. I also got the SDRplay RSP1B box: This offers a great listening experience at a very low price compared to the iCOM hardware. I had one before and bought one again after a (somewhat limited) Mac version of the software became available. This device needs a computer to be connected to the receiver. For some time now a nifty little device has appeared which not only works standalone, it even allows you or anyone else to utilize the ...
Meer lezen

Tiny Cheap Fluid Bed Roaster by Tije and Jan

-
Afbeelding
(also see Daily Coffee News feature ) Tije designed and made the following structure for a tiny and cheap fluid bed roaster, to which Jan van der Weel added the Arduino parts, electronics and programming: Sketch by Tije de Jong Jan sourced a very cheap blower (€ 11) to start with, Tije developed and constructed the mechanics, Jan built together and programmed the TC4 / SSR electronics.  On his blog, Jan will specify exactly how the TC4 part is combined and programmed and I will copy these details into this blog entry, just as Jan will use this video in his blog. We did a few test roasts to make sure it works at all and it does. Towards the end, the first roast tended to get a flat BT line and airflow was slightly decreased. 200g seems max load of green beans. Second roast a little more power was given to the heater. Next we will try the Background Roast driven by the PID software of Artisan. A week later, with updated software that works better to change the...
Meer lezen