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    PT1000 Low temperature Reading

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    Duet Hardware and wiring
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    • akrogolfundefined
      akrogolf
      last edited by

      be1d8c76-948c-47f9-8819-86069c523df8-image.png

      Anyone know why my temp sensors would read such a low number? In ambiet room - bed temp is true. Pt1000 hotend temp claims 7.5 degrees. These are slice engineering PT1000 sensors. Firmware:

      M308 S1 P"temp1" Y"PT1000" A"RTemp" ;Pt1000 located in right side of hot block
      M308 S2 P"temp2" Y"PT1000" A"LTemp" ;Pt1000 located in left side of hot block
      M950 H1 C"out1+out2" T1 ;2 Heaters wired to separate connectors but treated as a single logical heater
      M570 H1 S360 ;Hot end may be a little slow to heat up so allow it 180 seconds
      M143 H1 S310 P1 T1 A0 ;Monitor heaters with sensor 1
      M143 H1 S310 P1 T2 A0 ;Monitor heaters with sensor 2

      Doesnt seem to matter if i switch them... I've tried everything under my small umbrella of knowledge. Vref, Voltage to sensors. I see talk of resistance stuff but i am not sure how to do that?

      deckingmanundefined gloomyandyundefined 2 Replies Last reply Reply Quote 0
      • deckingmanundefined
        deckingman @akrogolf
        last edited by

        @akrogolf which Duet board are you using?

        Ian
        https://somei3deas.wordpress.com/
        https://www.youtube.com/@deckingman

        akrogolfundefined 1 Reply Last reply Reply Quote 0
        • gloomyandyundefined
          gloomyandy @akrogolf
          last edited by

          @akrogolf What was the actual ambient temperature at the time? The bed is showing almost 36, so I assume that was not it?

          akrogolfundefined 1 Reply Last reply Reply Quote 0
          • akrogolfundefined
            akrogolf @gloomyandy
            last edited by

            @gloomyandy
            about 25C. Bed was cooling. Sorry - i claimed that bed was accurate.

            1 Reply Last reply Reply Quote 1
            • akrogolfundefined
              akrogolf @deckingman
              last edited by

              @deckingman

              The newest duet 3 mini wifi. I think .02 version?

              deckingmanundefined 1 Reply Last reply Reply Quote 0
              • deckingmanundefined
                deckingman @akrogolf
                last edited by

                @akrogolf Try this https://docs.duet3d.com/User_manual/Connecting_hardware/Temperature_connecting_thermistors_PT1000#when-to-calibrate

                Ian
                https://somei3deas.wordpress.com/
                https://www.youtube.com/@deckingman

                1 Reply Last reply Reply Quote 0
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