PT100 or Thermocouple K
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I run my PT100 cable through a tightly packed cable conduit with wiring for 2 fans, an endstop, heater cartridge, BLTouch and extruder stepper. To avoid interference I have twisted or braided as many of those cables as possible, and used four unshielded 20 awg wires for the PT100, also twisted. So far no issues with temperature readings.
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Thanks for the replies, seems like PT100 four wire is the prefered choice among you.
What would be the argument to run a Thermocouple K over a PT100, Im asking because Duet offers both and if PT100 if prefered whats the argument for Thermocouple K?I just what to learn the pros & cons…
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Thermocouples are good for very high temperatures. See https://duet3d.dozuki.com/Wiki/Temperature_sensors.
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i found 3-wire PT-100 sensors. how do i connect it to 4 wire PT-100 board?
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You can connect the two wires that are connected to one end of the element as for a 4-wire sensor, and the single wire that is connected to the other end as for a 2-wire sensor. This isn't ideal, but it will work.
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In your blog post - https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/
You mention splitting the 2 wire PT100 to a 4 wire, is there any point to that?
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In your blog post - https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/
You mention splitting the 2 wire PT100 to a 4 wire, is there any point to that?
http://www.pentronic.se/media/26460/The_effect_of_2_3_4_wires_on_Pt100_060210.pdf
Because math?
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In your blog post - https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/
You mention splitting the 2 wire PT100 to a 4 wire, is there any point to that?
http://www.pentronic.se/media/26460/The_effect_of_2_3_4_wires_on_Pt100_060210.pdf
Because math?
Interesting, not super familiar with how they worked so when you 'just add' another wire to something it usually doesn't add functionality. So can you do the 2-4 conversion in the smart effector itself? Since the connector is 2 pins on the underside, or is that not built into the effector(I ask because my smart effector only has a 2 pin input but has the full 8(4 for PT100) on the top)
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Yes we do the 2 to 4 wire conversion in the Smart Effector itself. So the resistance of the wires and connectors between the Smart Effector and the Duet get cancelled out if you use 4 wires between the effector and the daughter board on the Duet; but the resistance of the wires from the PT100 to the 2-pin plug and the resistance of the 2-pin connector itself don't get cancelled.
If you ever use a 4-wire PT100 you can:
1. Desolder the 2-pin connector from the Smart Effector and replace it with a 4-pin in-line Molex Microfit 3 connector (the PCB is designed to accept both);
2. Cut the two traces on the top of the PCB. They are designed to be cuttable using a 3mm drill, stripboard style.
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Alright so if I want to just do that later I can go ahead and wire the 4 cables from the board to daughter and just upgrade the 2 pin to 4pin later?
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Alright so if I want to just do that later I can go ahead and wire the 4 cables from the board to daughter and just upgrade the 2 pin to 4pin later?
Yes.
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Alright so if I want to just do that later I can go ahead and wire the 4 cables from the board to daughter and just upgrade the 2 pin to 4pin later?
Yes.
If I wire 4 from effector to daughter(but only 2 from PT100 to effector) do I leave the jumpers installed or remove them(and software support for it as well)?
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Remove the daughter board jumpers.
