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:
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| Fresh from the unboxing |
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| 2x2 wires from the one probe |
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| The probe with 2 TC's inside |
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| Everyone wondering what color is + or - on this type probe, check their mug! |
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| Connecting the wires to the plug for Amprobe |
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| Previous setup with to probes |
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| New situation: one dual probe |
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| Connection points on the PID inside the roaster |
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| Probe: green and white wires in the center |
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| Testing: works! | |
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