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UMO+Temperature Calibration


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Posted · UMO+Temperature Calibration

Hi bobrieg,


Welcome in here.


If you have an UMO+, you should not have thermocouples, right?

Normally this setup is using PT100 a very accurate temperature sensor and do not require any calibration.


Please confirm.





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    Posted · UMO+Temperature Calibration

    Thanks for the quick reply, Torgeir...yes, I indeed have the UMO+ with PT100 sensors.  I used the word "thermocouple" generically, and incorrectly.


    I have a digital high temp thermometer which uses a K thermocouple sensor.   When my bed is set at 70C, the external thermometer reads 62 degrees.  When I put the probe against the outside of the heater block, it reads 235C when the UMO+ readout is 220C.  My UMO+ was purchased in the summer of 2018.  I did replace the heater block PT100 sensor about a year ago, but I never changed the bed temp sensor.


    On a separate, but perhaps related issue, is there a firmware upgrade that might be necessary, or advised?


    Thanks for your help


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    Posted · UMO+Temperature Calibration

    Hi Bob,



    The bed is tricky to have the real temperature when measuring at a "glass" plate. As I've said, the PT100 sensor very accurate, this is why it is used in "almost" all jet engines there is for inlet air temperature for such type of engines.


    When it comes to the extruder, the heater and PT100 installed into the heat block, we need to notice that the heater is on one side and the PT100 is on the other.


    There is sometimes some error due to to much play where the PT100 is installed, the hole is to large. So the PT100 do not have a good thermal contact, so will be slow and sensing to lo temperature. To improve this problem, fill the PT probe hole with "copper paste" then install the probe. Use a rag and remove the overfill. When test heating, use a rag as there will be some light leakage of the thinner part of this infill. There will be some light smoke, so increase the temp gradually and vent. All this will evaporate and the probe will have much better thermal response.  BTW., this paste stand 1100 deg. C. So no worry here.

    I'm using this all the time on my printer and it is working very well. Also your probe would not get stuck burnt in the block.

    Well, I'm using this on the heater as well.


    When heated up, the temperature should "normally" never differ more than ± 1 deg. Celsius. If it does, perform the above..



    Also to note, the firmware have a specification for for the temperature sensors that is installed.



    Good luck













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