PT100 sensor and Daughter Board issue
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that is not the official duet documentation.
the official duet documentation says
https://duet3d.dozuki.com/Wiki/Gcode#Section_M308_Set_or_report_sensor_parametersRnnn Series resistor value. Leave blank to use the default for your board.
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@Veti said in PT100 sensor and Daughter Board issue:
that is not the official duet documentation.
the official duet documentation says
https://duet3d.dozuki.com/Wiki/Gcode#Section_M308_Set_or_report_sensor_parametersRnnn Series resistor value. Leave blank to use the default for your board.
I believe it is Official documentations; R values for the Duet Wifi "R4700" But it did not work with our case. That`s what I mean.
https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors#Section_The_M305_M308_R_parameterI don`t blame, that's just feedback from the user perspective.
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@sozkan said in PT100 sensor and Daughter Board issue:
R values for the Duet Wifi "R4700" But it did not work with our case.
that is true for the normal thermistor on the duet.
its not true for the dautherboard. -
@sozkan said in PT100 sensor and Daughter Board issue:
I believe it is Official documentations; R values for the Duet Wifi "R4700" But it did not work with our case. That
s what I mean. https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors#Section_The_M305_M308_R_parameter I dont blame, that's just feedback from the user perspective.but that does say PT1000 not PT100; different beasts.
in any case it should be ammended I guess as the current reccomendation is to leave out R unless you've modified the board or have a very early board. firmware will apply the correct value for a given board - maestro and duet 3 have different value to duet 2 wifi/ethernet
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@bearer The header starts with; "Connecting thermistors or PT1000 temperature sensors
The Duet series supports 4 types of temperature sensor: thermistor and PT1000, thermocouple, and PT100. "Since I don`t see specifically PT100 example, When I see this header, I consider this is a kind of group of sensors.
"This section describes how to connect thermistors or PT1000."isn't it confusing?
However, it seems like my setup working on the ambient temperature as I share the conclusion, I don`t worry much about what it was saying.
Thanks for all your contribution. -
@sozkan said in PT100 sensor and Daughter Board issue:
However, in the Duet documentation, this "R4700 " was recommended!
Where in the documentation did you see it recommended?
PT100 documentation is at https://duet3d.dozuki.com/Wiki/Connecting_PT100_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 -
@dc42 said in PT100 sensor and Daughter Board issue:
Where in the documentation did you see it recommended?
https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors
The Duet series supports 4 types of temperature sensor: thermistor and PT1000, thermocouple, and PT100.
maybe that could be re-written to something like
The Duet series supports 4 types of temperature sensor: PT1000, as well as PT100, NTC thermistor and thermocouple.
with links to the three other pages, maybe it would be clearer to those not intimately familiar with types of sensors.
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@bearer said in PT100 sensor and Daughter Board issue:
@dc42 said in PT100 sensor and Daughter Board issue:
Where in the documentation did you see it recommended?
https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors
The Duet series supports 4 types of temperature sensor: thermistor and PT1000, thermocouple, and PT100.
maybe that could be re-written to something like
The Duet series supports 4 types of temperature sensor: PT1000, as well as PT100, NTC thermistor and thermocouple.
with links to the three other pages, maybe it would be clearer to those not intimately familiar with types of sensors.
Right
Thanks. -
@dc42 said in PT100 sensor and Daughter Board issue:
@sozkan said in PT100 sensor and Daughter Board issue:
However, in the Duet documentation, this "R4700 " was recommended!
Where in the documentation did you see it recommended?
PT100 documentation is at https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors.
Thank you very much. That`s exactly what I have done. It seems like working. I will share the youtube video on action.
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@sozkan said
Heat bed and Hotend temperatures slightly different. I assume PT100 cable length resistance might cause the difference right?
- Heat Bed Sensor: an NTC 100k Thermistor connected to the board heat bed connector.
- Hotend Sensors: 2 Piece of 2 wire PT100 type sensors comes with Dyze-Design Typhoon HotEnd.
Without knowing exactly where Dyze get their PT100 chips from (and hence what class they are)...
RTD's (PT100 and PT1000's) are normally laser trimmed, platinum resistors. At room temperature they will typically be accurate to about 0.3 degrees of each other. And they are be read by a chip specifically designed to do that, so it can get better resolution across the usable range of an RTD.
A Thermistor on the other hand is a much lower quality device, that will probably vary by 2-3 degrees even at room temp, and due to the way it changes resistance, has less resolution at room temp. (Its not unusual for thermistors to vary by up to 20 degrees at 220C).As @bearer said, 4 wire sensors would eliminate any error due to cable resistance, but for 3D printing you don't need that level of accuracy.
The biggest advantage of an RTD is that if you ever replace one, you'll still get the same reading at the same temperature. -
@theruttmeister Thank you for informative writing.
I have an extra 8-meter length after the hot end. However, try to make ohmic losses as low as possible by using 0.75 mm cable. It seems like working ( with a 2-3 celsius difference from the Thermistor on the heat bed at room temperature) I also think that`s not an issue.
B. Regards.
