Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Semitec 104NT-4R025H42G (SOLVED)

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
    4
    8
    2.3k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • pabomanundefined
      paboman
      last edited by paboman

      Is anyone using semitec 104NT-4R025H42G thermistor ?
      I am converting a machine electronics from Smoothie to Duet and want to maintain that hotend thermistor but dont know how to configure the config to have a reasonable temperature readings.
      I found this steinhart values from the smoothie wiki, How to input this curve into Duet config ?

      0.000797110609710217F 0.000213433144381270F 6.5338987554e-08F

      source:Smoothie Wiki

      thx!

      1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators
        last edited by

        Ignore the first value, that's the A value and RRF uses the resistance at 25C instead. Take the reciprocal of the second value and use that as B in the M305 command. Use the third value as C.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        1 Reply Last reply Reply Quote 1
        • pabomanundefined
          paboman
          last edited by

          I have changed the line to:

          M305 P1 T100000 B0.000213433144381270F C6.5338987554e-08F R4700
          

          but now I am getting 2000°C 🤔

          botundefined 1 Reply Last reply Reply Quote 0
          • botundefined
            bot @paboman
            last edited by

            @paboman the reciprocal would be a fraction of 1/0.000213433144381270 which equates to roughly 4685.

            *not actually a robot

            pabomanundefined 1 Reply Last reply Reply Quote 2
            • pabomanundefined
              paboman @bot
              last edited by

              thank you guys, learned something new today 🙂

              1 Reply Last reply Reply Quote 0
              • Deltasquareundefined
                Deltasquare
                last edited by

                Sorry for bumping this up, but I do not get a reasonable solution.

                So far, for the Semitec 104NT-4-R025H42G thermistor as it is used in the Deltaprintr Hotend (which I want to integrate) I followed along the
                So for adjusting the thermistor settings I got this:

                M305 P1 T100000 B4658 C6.5338987554e-08F R4700
                

                Is this correct?

                We have got the resistance at 25C (R), the calculated B Value of 4658 nd a C value of C6.5338987554e-08F (Including the F? Is this Fahrenheit or Farad or even necessary? Apparently it does not make a difference for the thermistor.)

                Do I interpret this right?

                It gives me appr. 680C while fluctuating within a window of about 20C.

                So I checked whether I can find other values and found the thermistor on mouser:

                https://www.mouser.at/datasheet/2/362/P18-NT-Thermistor-1535133.pdf

                It has a B value of 4267. With this other B value I get readings in between 882C and 908C. Thats even worse.

                Can anyone point me in the right direction? What am I missing? Or maybe is the thermistor broken?

                1 Reply Last reply Reply Quote 0
                • dc42undefined
                  dc42 administrators
                  last edited by dc42

                  @Deltasquare said in Semitec 104NT-4R025H42G (SOLVED):

                  We have got the resistance at 25C (R), the calculated B Value of 4658 nd a C value of C6.5338987554e-08F (Including the F? Is this Fahrenheit or Farad or even necessary? Apparently it does not make a difference for the thermistor.)

                  Delete the F, it's a Smoothieware thing. Also delete the R4700 - it's not needed and depending on what Duet you are using, it may be the wrong value.

                  However, with readings that high, I suspect a short in your wiring.

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  1 Reply Last reply Reply Quote 0
                  • Deltasquareundefined
                    Deltasquare
                    last edited by

                    Problem solved.
                    However it was due to the coloring of the wiring. Someone switched the colors and apparently the Heater has a pretty high resistance.
                    Sorry for bothering and thank you for clearing that up!

                    So the solution is:

                    M305 P1 T100000 B4658 C6.5338987554e-08
                    
                    1 Reply Last reply Reply Quote 0
                    • Branzoundefined Branzo referenced this topic
                    • First post
                      Last post
                    Unless otherwise noted, all forum content is licensed under CC-BY-SA