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    Precision Piezo PT1000 sensor?

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    • Samuel_kundefined
      Samuel_k
      last edited by

      Hi all,
      I bought a couple of Precision Piezo PT1000 sensors that I'm planning to use together with a Maestro, but the temperatures are off by quite a bit. I taped down a trusted E3D thermistor to the heat block to check the readings, and even though they give the same reading at room temp, the PT1000 thinks that 100°C is at 83°. The PT1000 is configured using M305 P1 X501.

      I've found lots of other threads about PT1000 issues with various other sensor suppliers, but not this one, and since it seems to be quite common among Duet users I wonder if there's something off with my sensors. How does everyone else configure them? Is it a lost cause to get them working on an ADC channel, and should I just bite the bullet and tune them in as thermistors instead? (ping @DjDemonD 🙂 )

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      • Moriquendiundefined
        Moriquendi
        last edited by

        You need to specify the value of the series resistor in order to get accurate readings

        M305 P1 X501 R4700 ; Specifies a 4.7k resistor for the Duet Wifi

        M305 P1 X501 R2200 ; Specifies a 2.2k resistor for the Duet Maestro

        Idris

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        • dc42undefined
          dc42 administrators @Moriquendi
          last edited by

          @moriquendi said in Precision Piezo PT1000 sensor?:

          You need to specify the value of the series resistor in order to get accurate readings

          M305 P1 X501 R4700 ; Specifies a 4.7k resistor for the Duet Wifi

          M305 P1 X501 R2200 ; Specifies a 2.2k resistor for the Duet Maestro

          Idris

          That shouldn't be necessary, because the default values are correct for all Duets except the Duet 085 and some Duet 06.

          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

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          • Moriquendiundefined
            Moriquendi
            last edited by

            Is that a recent firmware feature?

            Idris

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            • dc42undefined
              dc42 administrators @Moriquendi
              last edited by

              @moriquendi said in Precision Piezo PT1000 sensor?:

              Is that a recent firmware feature?

              Idris

              RepRapFirmware for the Duet WiFi, Ethernet and Maestro have always had the correct default values. The Duet 06/085 has the default set to 1K because the Duet 06 originally used 1K resistors, but that was changed to 4.7K in later Duet 06 boards and in the Duet 085.

              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

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