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    Problem with Pt100

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    Duet Hardware and wiring
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    • Dracula36undefined
      Dracula36
      last edited by

      hello I'm having problems with the pt100 sensor. if I connect the sensor directly to the MAX31865-based daughter boards I have no problems and I can have the right temperature the problem is when the wires are firmly in order to arrive with the sensor to the cartridge, it no longer detects the temperature and marks 2000 degrees. how can I fix it? do I need a special cable? thanks

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      • Dracula36undefined
        Dracula36
        last edited by

        I solved. the cable was too double. sorry for the post as it is eliminated?

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        • DjDemonDundefined
          DjDemonD
          last edited by

          FYI I recently had a problem with intermittent connection on an e3d pt100 and it was one of the blue braided leads from the sensor poorly crimped into the pre-attached connector. I cut the connector off and soldered it to the longer leads (shielded) I am using which run back to the duet.

          Simon. Precision Piezo Z-Probe Technology
          www.precisionpiezo.co.uk
          PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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          • Dracula36undefined
            Dracula36
            last edited by

            what are the shielded cables you used? because the temperature is not constant but varies eg between 189 and 194 when imposed 190 degrees. will it be because the cables are not shielded?

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            • Dougal1957undefined
              Dougal1957
              last edited by

              @Dracula36:

              what are the shielded cables you used? because the temperature is not constant but varies eg between 189 and 194 when imposed 190 degrees. will it be because the cables are not shielded?

              Have you run the autotune system on the heater this is more likely the cause but I use a twisted pairs Cat 5 cable but it carries more than just the PT100 if you do use cat5 then it must be stranded and not solid core

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              • Dracula36undefined
                Dracula36
                last edited by

                I did the autotune but I did not solve the problem … I also narrowed the thread thinking it was the problem. if I connect the pt100 directly to the board I do not have this problem ...

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                • Dougal1957undefined
                  Dougal1957
                  last edited by

                  ok in that case make sure you use Twisted pair cable and connect it in 4Wire mode

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                  • DjDemonDundefined
                    DjDemonD
                    last edited by

                    I am using pt100 on my corexy and used canbus 2-core shielded cable (ground the shield to a GND pin on duet). But this was because I thought the intermittent 2000 degrees I was getting was interference, it wasn't it was an intermittent connection, so maybe the shielded cable is unnecessary.

                    Simon. Precision Piezo Z-Probe Technology
                    www.precisionpiezo.co.uk
                    PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                    • WalterSKWundefined
                      WalterSKW
                      last edited by

                      I use 2 twisted pairs of a 8-pairs shielded cable in a 4-wire connection. No issues whatsoever. Cable is around 100cm long.

                      Brian once said: "Always look at the bright side of life"
                      Works for me!

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