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