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Help needed identifying part


hephaestus
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Posted · Help needed identifying part

Hello,

 

My UMO Original (not +0) has developed an under extrusion problem. One possible culprit is the temperature sensor on the print head.  I’ve been unable to find a clear answer online or in the documentation as to what type of sensor this is. Is it a K-type thermocouple? Is it a PT-100 thermocouple? Is it a thermistor? What values should I be looking for when testing it? Resistance across the yellow and red leads is 1.6 ohms, if it’s is a PT-100 then it’s definitely shot. The sensor end inside the metal sleeve at the end is loose and slides back and forth inside. 
 

This sensor goes to a small board on top of the print head that has a AD597 chip on it.

 

any help would be appreciated, this printer has been down for a couple months now and I want to join in the printing of supplies for the pandemic. 
 

thanks

DCC887E0-CD92-405F-B0AD-2DBA380B4540.jpeg

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    Posted (edited) · Help needed identifying part

    the AD597 is a thermocouple conditioner, so, yeah, that's probably a thermocouple. find an online table somewhere that gives you type K voltages wrt temperature. measure the voltage at the wires when the sensor is at room temprature and note it down. note: these voltages are extremely small. your voltmeter has to be good at mV ranges.  then, put the sensor in boiling water (i.e., 100°C exactly) and do another reading. do your measurements align with the values given in the table?

    Edited by Porkpie
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