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Old 02-15-2012, 06:30 PM   #1
Elfmaze
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Oct 2008
Allentown, PA
Posts: 562
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I am currently building a brew-magic clone And i'm planning on a PID with RIMS tube electric design with direct fire assist.

I also have an UDS smoker that i would like to add a fan and controller to.


Can these two systems be the same thing? It seems the roles are fairly similar. When a PID "learns" Is it just during that session how the heat is reacting or does it learn over time? meaning if i swap between the systems will i have error?

Should a fan for a smoker be run digitally or analogue?

 
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Old 02-15-2012, 07:17 PM   #2
JonathanS
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Sep 2011
Tucson, AZ
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I did a combination smoker and brewing process controller build recently. In my case, I have 2 PIDs, a timer, 1 SSR, and 2 quick disconnect temperature probes.

For brewing process, currently it only functions as a monitor, but possibly in the future I will use furnace valves to automate (currently using NG).

For smoker process, 120 VAC is passed through SSR and the electric heating element (power output on left) on my el-cheapo brinkmann smoker is turned on and off to maintain temp.

I have a total of 4 RTD / thermocouple sensors. Each one I calibrated to slush water and boiling water data points. The offsets have to be put in each time I switch processes. Regarding the PID "learning" or autotuning, I am sure you could probably write down all of the parameters and input them as needed. I have only autotuned the smoker heating element PID.

For UDS smoker with a fan, you would use the relay output on the PID though, essentially an on/off switch. I have not read up or have experience on this mode. My understanding was that PID learning / autotune only comes into play when operating an SSR and controlling an electric element. I could be wrong through.

Hope this helps!
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Old 02-15-2012, 10:10 PM   #3
AdamCanFly
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Jun 2009
Dallas, TX
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I will probably do the same thing with my control panel. Ya'll wouldn't also happen to be left handed pilots would you?

 
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Old 02-16-2012, 03:09 AM   #4
Elfmaze
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Oct 2008
Allentown, PA
Posts: 562
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Cant say i'm left handed, but i am a pilot / Air traffic controller

 
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