Thermal sensor -thermistor 12V or 24V
hello,
I have some older material in my spare box.
Is there a way to find out if a thermal sensor is 12v or 24V?
I know there is a way to recognise the 24V Heatsink by measuring the resistance.
Can the same be done with the thermistor? thx!
RE: Thermal sensor -thermistor 12V or 24V
It may not make a lot of difference. From what I read, most thermistors are manufactured with at least a 100% safety factor, meaning one "rated" for 12 volts would probably still be functional at 24 volts. The calibration would be different for sure, but that's a different part of the circuit. There is probably a trim capacitor or variable resistor that makes that calibration, or there may be a routine in the firmware that handles it. I've never had to replace one (although I thought I might have to, so ordered a spare.) There should be a topic in the Knowledge Base that gives the procedure, although it probably assumes an apple-for-apple exchange.
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RE: Thermal sensor -thermistor 12V or 24V
hello,
I have some older material in my spare box.
Is there a way to find out if a thermal sensor is 12v or 24V?I know there is a way to recognise the 24V Heatsink by measuring the resistance.
Can the same be done with the thermistor? thx!
Important is the internal resistance, which for Prusa thermistors is about 100kohms at 25 degrees C. The thermistor table in the firmware is adapted to this type. If you use a different type you have to use a different table and recompile the firmware.
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RE: Thermal sensor -thermistor 12V or 24V
Based on the knowledge base, the thermistors are supposed to have resistance 100kOhm at 25°C. They do not mention any differences for 12V and 24V printers.
Also Prusa eshop sells the same part for all printers. So I belive it is really usable for both voltages.
https://help.prusa3d.com/cs/article/multimeter-usage_5299
https://shop.prusa3d.com/en/mk3mk3s/205-hotend-thermistor-e3d.html
RE: Thermal sensor -thermistor 12V or 24V
A thermistor is a resistive device, voltage doesn't matter.
What does matter: and this is critical : is the temperature vs resistance curve, or profile. Exact matches are needed, or if you are an engineer wanna-be and can edit and compile new code, you can use another part number with a different profile. But again, the thermistor and the profile in software must match.