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    How to configure Duet with E3D thermistor?

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    • zaptaundefined
      zapta
      last edited by zapta

      I am revisiting the nozzle temperature configuration of my printer, because I suspect that the temperature reading is significantly off.

      The Duet documentation provide these thermistor info:

      7031e5d9-bdf2-4bc6-952c-d8facf383acf-2021-12-14_18-12-42.png

      https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors

      However, looking at the Semitec datasheet it has these two 100k thermistors which have different B values than the one above:

      4bc6545a-f895-4b2e-a8fb-10b1c941b4b0-2021-12-14_18-19-24.png

      https://www.mouser.com/datasheet/2/362/P18_NT_Thermistor-1535133.pdf

      Am I missing something? What are the correct B and C values for an E3D thermistor and where can I find a datasheet with temperature/resistance table to calibrate the Duet?

      JoergS5undefined o_lampeundefined 2 Replies Last reply Reply Quote 0
      • JoergS5undefined
        JoergS5 @zapta
        last edited by

        @zapta according to https://www.mouser.de/ProductDetail/Semitec/104GT-2?qs=wgO0AD0o1vvQ2Rm%2FPgvFdg%3D%3D the lifecycle for 104GT-4 ends and the NT-4 series is a possible replacement. I read you other posts and will go with PT1000 now also.

        To calculate the parameters, there is https://www.thinksrs.com/downloads/programs/therm calc/ntccalibrator/ntccalculator.html which was a hint from David dc42 https://forum.duet3d.com/topic/6793/ntc-3950-cartridge-ht-ntc100k-how-to-config/11

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        • rjenkinsgbundefined
          rjenkinsgb
          last edited by

          This is the data for the original Semitec 104GT-2; slightly different again.

          The platinum RTDs are the best choice for high precision..

          https://static.rapidonline.com/pdf/61-0452.pdf

          Robert J.

          Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.

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          • o_lampeundefined
            o_lampe @zapta
            last edited by

            @zapta
            The B-values we sometimes see are more real life data, adapted to the higher temps we need for extruders. At least, that's my interpretation.

            zaptaundefined 1 Reply Last reply Reply Quote 0
            • zaptaundefined
              zapta @o_lampe
              last edited by zapta

              I performed temp tests using known resistors and the Duet itself seems to give very close results for one of the two Semitec 100K thermistor models so I presume this is the one that E3D sells. This validates the Duet's recommended configuration for the E3D thermistor. It says nothing though about the specific thermistor I am using.

              For example, 210.4 ohms gave 239.9C where the expected value is 240C.

              b91fc00c-0c59-4a31-a94b-ee64c4d9ee47-image.png

              7991d78c-d4c7-4296-9869-993fab4bad99-image.png

              1 Reply Last reply Reply Quote 0
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