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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Heat treating oven control equipment
I have a small 6"x6"x4" oven and need temperature control.
I am considering a Fuji PXR3 temperature/process controller and will need a thermocouple and a power switching device. My electronic skills are pretty basic. I would welcome advice on what thermocouple, insulation and housing is best suited. Should I choose a relay or a sold state relay? Is there a better way to heat treat and case harden? TIA, John. |
#2
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Yes use a solid state relay any thing else will were out fast .
Here is the type of probe I use ..http://www.coleparmer.com/catalog/pr...&par=6512&cat= 1&srt=&flt=[all]~[all]~K&sch=533&sku= This probe is a type K controler |
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I have an earlier version of the same controller on my furnace and it works
very well. Use a solid state relay, just make sure you heat sink it. Omega makes any kind of thermocouple you need and they have a website. Make sure the controller turns off with loss of thermocouple signal. I used two neon pilot lights on my set-up. One was a master power "On" and the other was "Heater Power" , downstream of the relay showing when the heater is energized and thus giving a ready indication of proper relay/controller function. Randy "John Wilson" wrote in message . .. I have a small 6"x6"x4" oven and need temperature control. I am considering a Fuji PXR3 temperature/process controller and will need a thermocouple and a power switching device. My electronic skills are pretty basic. I would welcome advice on what thermocouple, insulation and housing is best suited. Should I choose a relay or a sold state relay? Is there a better way to heat treat and case harden? TIA, John. |
#4
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Heat treating oven control equipment
Why does your oven control equipment need to be heat treated? (Sorry, I just couldn't resist 8-) ) Bob |
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Thanks for the advice and web sites. Bob my English (my first and only
language) may not be perfect but I get along and I did appreciate your humor. John |
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I know little about heat treating, but from what I do know about the temp ranges involved I think a type K thermocouple would be suitable. Type K is good up to about 2000 deg F, maybe a bit higher, most controllers I've seen accomodate type K and they're readily available. You can get type K thermocouple wire from McMaster, along with the yellow connectors for them. It's easy to weld up thermocouples from wire, and it's a lot cheaper than buying them readymade if you don't need 0.1 degree absolute accuracy. I weld "utility" thermocouples with a Smith O/A Li'l Torch. If I want them better than that, I TIG weld them! I pull an arc with the TIG to a copper block and then bring the wires near the arc (and within the argon shielding gas) to weld them. It works for me! On Tue, 31 Aug 2004 21:30:46 -0400, "John Wilson" wrote: I have a small 6"x6"x4" oven and need temperature control. I am considering a Fuji PXR3 temperature/process controller and will need a thermocouple and a power switching device. My electronic skills are pretty basic. I would welcome advice on what thermocouple, insulation and housing is best suited. Should I choose a relay or a sold state relay? Is there a better way to heat treat and case harden? TIA, John. |
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