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IR temperature sensor for annealing
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IR temperature sensor for annealing

by Jake8587 on Fri May 20, 2022 9:00 am

Ok, I need help I have been searching for something to measure while annealing brass. All of the IR sensors I have seen can only reach Temps around 300c, I need something that will measure to above 450c.

Thanks for any help.
Jake

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Re: IR temperature sensor for annealing

by ashleyjames on Fri May 20, 2022 9:13 am


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Re: IR temperature sensor for annealing

by Jake8587 on Fri May 20, 2022 11:16 am

Thanks, Ashley

That would work, but a little out of my price range. Im new to coding and not really sure how to hook that up with a UNO. Thanks again.

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Re: IR temperature sensor for annealing

by sj_remington on Fri May 20, 2022 11:42 am

A thermocouple+amplifier can be used to measure temperatures in the required range. Cheap and easy to connect to an Arduino.

https://learn.adafruit.com/thermocouple/

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Re: IR temperature sensor for annealing

by Jake8587 on Sat May 21, 2022 5:42 pm

I would be worried about the metal in the thermocouple heating up in the induction field. They have to touch the object to measure tempature right?

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Re: IR temperature sensor for annealing

by petespaco on Sun May 22, 2022 1:39 pm

Many folks out there have built devices for annealing the necks of brass cartridge cases. It appears to me the most of them use a 750 degree F Tempilstik crayon to set up their induction heaters for each cartridge. You rub the crayon onto the part. They set a timer once they see how long it takes to melt the Tempil crayon and simply go from there.
I have done a bunch of experiments with those induction heaters to help those guys get their systems going reliably.
But, for your application, here's an idea that comes to mind if exact temperature isn't all that important:
My observations show me that the brass just starts to glow (in a dark room) at about 500°C. So--- how about using a light sensor to sense when any visible light appears on the surface of the part you want to anneal? Could be resistive or photovoltaic.
You might use a non conductive tube of some sort that is several inches long to protect the sensor from extraneous light.

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Re: IR temperature sensor for annealing

by Franklin97355 on Sun May 22, 2022 1:52 pm

@petespaco :
I had the same thought but had no experience to make the post. Thank you.

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