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PT1000 cable length, connector, and wire type

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Duet Hardware and wiring
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  • undefined
    briangilbert
    last edited by 15 Apr 2018, 00:26

    @MSquared I think thats more for PT100 sensors..

    Co-creator of the Zesty Nimble direct drive extruder

    undefined 1 Reply Last reply 15 Apr 2018, 04:13 Reply Quote 0
    • undefined
      MSquared @briangilbert
      last edited by 15 Apr 2018, 04:13

      @briangilbert Touche'. Well in that case I probably can't tell you anything you don't already know. If it were me I would probably just use one of the twisted pairs I have lying around from the dismantling of an ethernet cable. The resistance of copper wire at the length we would be talking about would be negligible, it won't be carrying any meaningful current and while not strictly required the twist would give it a little extra protection from interference.

      1 Reply Last reply Reply Quote 0
      • undefined
        DjDemonD
        last edited by DjDemonD 15 Apr 2018, 21:15

        I havent tried yet putting a few joins in a pt1000 wire to see what effect it has. Be quite worth trying though. Ours come with 2m cables.

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

        undefined 1 Reply Last reply 16 Apr 2018, 15:45 Reply Quote 0
        • undefined
          dc42 administrators @DjDemonD
          last edited by 16 Apr 2018, 15:45

          For a PT100 sensor, 1 ohm of resistance in the cable and connectors will increase the temperature reading by 2.5C. For a PT1000 it would be 0.25C. So cables and connectors won't have much effect with a PT1000.

          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

          undefined 1 Reply Last reply 17 Apr 2018, 07:01 Reply Quote 0
          • undefined
            briangilbert @dc42
            last edited by 17 Apr 2018, 07:01

            @dc42 thanks, I was hoping this would be the case.

            Co-creator of the Zesty Nimble direct drive extruder

            1 Reply Last reply Reply Quote 0
            • undefined
              c310
              last edited by 17 Apr 2018, 12:07

              @dc42 how do we config DuetWiFi for PT1000 than? there is nothing in WiKi, just pt100... thanks!

              undefined 1 Reply Last reply 17 Apr 2018, 20:37 Reply Quote 0
              • undefined
                DjDemonD
                last edited by DjDemonD 17 Apr 2018, 16:10

                Although it is not necessarily "proper" if you find there is an offset in the temperature, or as I do prefer to offset the temp reading to show the bed surface temperature then change the series resistor value by a small amount from the console, then update config.g.

                I have got 3 connected to my cylinder delta using the following config

                M305 P0 X500 R4700 ; heater 0 uses a PT1000 connected to thermistor channel 0 which has a 4.7K series resistor
                M305 P1 X501 R4700 ; heater 1 uses a PT1000 connected to thermistor channel 1 which has a 4.7K series resistor
                M305 P2 X502 R4700 ; heater 2 uses a PT1000 connected to thermistor channel 2 which has a 4.7K series resistor

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

                1 Reply Last reply Reply Quote 0
                • undefined
                  c310
                  last edited by 17 Apr 2018, 19:12

                  @djdemond said in PT1000 cable length, connector, and wire type:

                  3 connected to my delta cylinder....
                  connected to thermistor channel 0.... channel 1 .... channel 2

                  does it mean you have simmultanius 3 readings from the same head AND you have 2 PT100 boards?

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                  • undefined
                    DjDemonD
                    last edited by 17 Apr 2018, 19:15

                    No I have 3 PT1000 sensors. One for Bed, one for hotend and one for chamber. No daughterboards at all. PT1000 can be connected directly. See my sig.

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

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      dc42 administrators @c310
                      last edited by 17 Apr 2018, 20:37

                      @c310 said in PT1000 cable length, connector, and wire type:

                      @dc42 how do we config DuetWiFi for PT1000 than? there is nothing in WiKi, just pt100... thanks!

                      Yes there is, https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors.

                      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
                      • undefined
                        c310
                        last edited by 18 Apr 2018, 18:01

                        i missed it. thanks!

                        Use the M305 command as for a thermistor, but add parameter X500+n where N is the channel number. Only the R, H and L parameters are significant. Example:

                        M305 P1 X501 R4700 ; heater 1 uses a PT1000 connected to thermistor channel 1 which has a 4.7K series resistor

                        1 Reply Last reply Reply Quote 0
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