Thermistor.

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Macflame
Posts: 29
Joined: Mon Feb 09, 2015 11:22 pm
Location: Sheffield, U.K.

Thermistor.

Post by Macflame » Thu May 14, 2015 9:42 am

I am having trouble sourcing a thermistor for my Mini. Could I just use any 100K thermistor? Or does anyone know where I can but the right sized PT100?

andif62
Posts: 56
Joined: Sat Dec 20, 2014 3:26 pm
Location: Germany

Re: Thermistor.

Post by andif62 » Thu May 14, 2015 2:23 pm

I´m using this kind of thermistors: http://www.amazon.co.uk/dp/B008SOCB8Y/r ... 31_TE_dp_1
Just take care that you chose NC (normal close) type.

Macflame
Posts: 29
Joined: Mon Feb 09, 2015 11:22 pm
Location: Sheffield, U.K.

Re: Thermistor.

Post by Macflame » Thu May 14, 2015 9:04 pm

Many thanks for the quick reply but I am after a thermistor not a thermostat.
The thermistor is placed in the heater block to read the heater/nozzle temperature.

stormychel
Posts: 241
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Location: Belgium
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Re: Thermistor.

Post by stormychel » Thu May 14, 2015 9:14 pm

There's a lot of them for sale on eBay :)
@stormychel

Macflame
Posts: 29
Joined: Mon Feb 09, 2015 11:22 pm
Location: Sheffield, U.K.

Re: Thermistor.

Post by Macflame » Fri May 15, 2015 1:31 pm

Thank you stormychel but the PT100s being sold on their are too wide. The heater block will only take a thermistor that is 2.5mm wide (if my calipers are to be believed.). I cannot find one that small. I was hoping I could use any 100K thermistor in its place. The Mini's firmware may be specific in the type of thermistor used and I cannot access it. Unlike Marlin firmware and the like, where you can change the values of the thermistor used.

stormychel
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Re: Thermistor.

Post by stormychel » Fri May 15, 2015 6:20 pm

Ok. You could order a generic one and measure it's resistance?
@stormychel

Macflame
Posts: 29
Joined: Mon Feb 09, 2015 11:22 pm
Location: Sheffield, U.K.

Re: Thermistor.

Post by Macflame » Sat May 16, 2015 7:59 am

I think it may be a case of trying a couple of differently manufactured 100k thermistors and seeing which is the most accurate and stable. PT100s are made from platinum and give the most consistent readings over time and temperature.

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