Joined: November 19 2011 Location: United States Posts: 7
Posted: September 20 2012 at 12:09am | IP Logged
Hello,
I want to building a heat treat oven (5x5x14) and have started to gather supplies. I picked up some insulated K 23 bricks, enough for a small oven. I want to use it on a 120 v 20 Amp breaker but I am not sure with PID controller I need and will any SSR (solid state relay) do? I have been searching around ebay for one but most if not all I see are listed as 220v. I am no electrician. Thanks.
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Sagittarii
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Joined: January 03 2011 Location: Australia Posts: 478
Thanks. I was looking on their earlier site and they are the same thing you can buy on ebay direct from the manufacture for less than half the cost. I don't have 220v AC in my shop but 115~ V AC on a 20 amp breaker so I am going to keep my design at 16-17 amps max. I have no experiences with PID controllers and wanted to know if they will all work on 110 or 115V AC or do I need to buy a model that is specific to the lower voltage? Also, do you know of a wiring daigram for a 110 set up?
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tr6guns
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Joined: November 04 2006 Posts: 1434
Posted: September 21 2012 at 1:57am | IP Logged
The PID has nothing to do with the Voltage of your oven, it is a controller of the temp. The one i have sends out a 12 volt signal to the SSR to control the off and on condition of the voltage to the Oven in coordination with the Temp i have set . You wire the SSR from your master Electrical Input Switch or otherwise Breaker through the oven and the SSR. I am no electrician either but 220 is just two legs of 110, so eliminate one leg and it should wire the same..
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From the sound of the description the PID will only detect and control up to 400 degrees C which is 752 degrees F which will not heat treat anything.. The thermocouple that is supplied is stated to be a 2M Type K which is 2282 degrees Fahrenheit.. The old adage of you get what you pay for, holds true....
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Lee74
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Joined: November 19 2011 Location: United States Posts: 7
Posted: September 22 2012 at 1:44am | IP Logged
tr6guns wrote:
From the sound of the description the PID will only detect and control up to 400 degrees C which is 752 degrees F which will not heat treat anything.. The thermocouple that is supplied is stated to be a 2M Type K which is 2282 degrees Fahrenheit.. The old adage of you get what you pay for, holds true....
Unfortunately, that appears to be the case. I waited to reply until after receiving a response from the seller and was told that they could reprogram it for higher temperatures but only if I ordered in volume so I found a different PID that would already do what I needed and placed a bid.
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Lee74
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Joined: November 19 2011 Location: United States Posts: 7
Posted: September 22 2012 at 7:13pm | IP Logged
tr6guns wrote:
From the sound of the description the PID will only detect and control up to 400 degrees C which is 752 degrees F which will not heat treat anything.. The thermocouple that is supplied is stated to be a 2M Type K which is 2282 degrees Fahrenheit.. The old adage of you get what you pay for, holds true....
I got my 16 gauge Kanthal A1 wire in the mail and was wondering if there is an optimal diameter to coil it to? I haven't seen anything specified in the various forums or tutorials I have read.
__________________ I'm not so smart that it hurts me, but i'm a long way from being stupid
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Lee74
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Joined: November 19 2011 Location: United States Posts: 7
Posted: September 23 2012 at 12:11pm | IP Logged
Thanks for the help again. That google article was helpful. At 120 VAC at 2000 watts, 21.95 feet of wire, I will have 7.2 ohms of resistance. It would draw 16.6 amps at that spec.
tr6guns wrote:
These are the specs. for wire that is pre coiled and can be ordered as such.. Or you have to figure the resistence out yourself..
#7103: 240 Vac Kanthal Heating Element - 2300 �F Max
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