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PID for a heat treat furnace.
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Housedad:
I have a Neycraft Jff-2000 heat treat furnace. It is an all manual 120v model and reaches a maximum of 2012F(1100C). I think I've had it for about 25 years. Still works like new.
https://www.ottofrei.com/Neycraft-JFF-2000-Fiber-Furnace-Chamber-Size-9-W-X-9-D-X-6-1?quantity=1&custcol_of_option_voltage=7
I am going to put a PID controller on it. I was thinking about using a basic PID since all I need is to be able to set ramp up, soak, and ramp down for basic heat treating. It is a pain in the butt having to manually monitor this thing every time I use it.
I was thinking of using one or the small ones from Automation direct, but I wondered if any of you had a recommendation for a better and/or preferably cheaper one that won't go bongo in the first try. The prices on some of the Ebay ones are so low that it scares me to even try them.
Thanks
Kleinstein:
Temperature controllers are build in large numbers in China. So they can be OK even for a low price.
For the high power consumption one may be a little careful with the current rating - Chinese products tend to go really to the edge with the claimed capacity, sometimes only valid for a short moment. This would be the main tricky point. Some may need an external solid state relay or contactor similar - this may be the safer way with respect to power rating. There may already be a contactor as part of the original furnace.
The other is to check if they support the temperature sensor.
wizard69:
--- Quote from: Housedad on April 28, 2020, 03:51:57 am ---I have a Neycraft Jff-2000 heat treat furnace. It is an all manual 120v model and reaches a maximum of 2012F(1100C). I think I've had it for about 25 years. Still works like new.
--- End quote ---
Carefully select the PDI controller, many of the extremely cheap ones will require a 24VDC supply. Also if you are going to implement your own control system you really should have a separate high temperature limit controller of some sort. The PID controller will also require a high current switch, which might already be in the oven already; however you need a PID controller that can drive that old relay.
--- Quote ---https://www.ottofrei.com/Neycraft-JFF-2000-Fiber-Furnace-Chamber-Size-9-W-X-9-D-X-6-1?quantity=1&custcol_of_option_voltage=7
I am going to put a PID controller on it. I was thinking about using a basic PID since all I need is to be able to set ramp up, soak, and ramp down for basic heat treating. It is a pain in the butt having to manually monitor this thing every time I use it.
--- End quote ---
Ramp Up, Soak, and Ramp down are not basic functions. If you want controlled cycles you will need to make sure the controller actually supports the features you want in the way you want. Frankly many of the cheap processor controllers are a bit of a pain to program, so you might want to look for easy of use features.
--- Quote ---
I was thinking of using one or the small ones from Automation direct, but I wondered if any of you had a recommendation for a better and/or preferably cheaper one that won't go bongo in the first try. The prices on some of the Ebay ones are so low that it scares me to even try them.
Thanks
--- End quote ---
If you want to control costs I'd look at the various ARduino projects out there. You then get extreme flexibility for setting up you ramp/soak cycles. If not DIY then there are dozens of possibilities form the likes of Omron, Watlow, Omega, Automation direct and many others.
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