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Which Thermocouple to buy ?

Posted: Tue Aug 29, 2017 6:06 am
by Waycer
Hey, I have a small question, where can I buy a good and cheap thermocouple ? I need it to check if the temperatures my printer shows are the right ones.

Re: Which Thermocouple to buy ?

Posted: Tue Aug 29, 2017 8:04 am
by Jimustanguitar
Using a thermocouple will require modifying the firmware and wiring. I've done this on a pre-V3. Basically you have the thermocouple, which has a 'polarity' and must be wired the right direction, it goes to a signal amplifier board, and then you connect power ground and signal wires from the amp to your controller. The signal wire goes to one of the analog inputs...

Firmware wise, you'll have to change the temp sensor type, and specify which analog input you've wired it to.

Which type of thermocouple you use will depend on which amplifier board you're using, they have to match. A "K Type" thermocouple is what I've seen the most. Check the documentation for Repetier firmware (or open up the sketch and read the comments) to see which boards already have a built in temperature table. That'll be your best bet, and the easiest upgrade.

Re: Which Thermocouple to buy ?

Posted: Tue Aug 29, 2017 8:18 am
by joe
Jimustanguitar wrote:Using a thermocouple will require modifying the firmware and wiring. I've done this on a pre-V3. Basically you have the thermocouple, which has a 'polarity' and must be wired the right direction, it goes to a signal amplifier board, and then you connect power ground and signal wires from the amp to your controller. The signal wire goes to one of the analog inputs...

Firmware wise, you'll have to change the temp sensor type, and specify which analog input you've wired it to.

Which type of thermocouple you use will depend on which amplifier board you're using, they have to match. A "K Type" thermocouple is what I've seen the most. Check the documentation for Repetier firmware (or open up the sketch and read the comments) to see which boards already have a built in temperature table. That'll be your best bet, and the easiest upgrade.


I think he is talking about a probe to test the temperature of his nozzle?

Re: Which Thermocouple to buy ?

Posted: Tue Aug 29, 2017 8:23 am
by Jimustanguitar
Ahhh..... If you want a cheap one, Harbor Freight sells a $20 multimeter that comes with a temperature probe :)

Re: Which Thermocouple to buy ?

Posted: Tue Aug 29, 2017 11:48 am
by Waycer
Jimustanguitar wrote:Ahhh..... If you want a cheap one, Harbor Freight sells a $20 multimeter that comes with a temperature probe :)


Okay, thanks for the informations !