Author Topic: PID autotune question  (Read 724 times)

Offline Pi

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PID autotune question
« on: March 11, 2013, 10:39:20 AM »
I have a RIMS and bought a new water heater element with a higher wattage than the existing one. I was gonna install and run the autotune function. Do you think recirculating water instead of wort will make much of a difference?
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Offline kylekohlmorgen

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Re: PID autotune question
« Reply #1 on: March 11, 2013, 11:27:28 AM »
I think as long as you set the water flowrate to approximately what your recirc rate will be during a mash, it should work just fine.

Make sure you start the auto-tune after you've got the flowrate adjusted and the water around mash temps.
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Offline gandelf

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Re: PID autotune question
« Reply #2 on: March 13, 2013, 05:53:01 AM »
Make sure you start the auto-tune after you've got the flowrate adjusted and the water around mash temps.

+1 I BIAB and continuously recirculate with a direct fired kettle. Using water or wort when auto tuning is a mute issue, in my experience. I have helped others automate their rigs. On the other hand; flow rate and heat output (BTU) WILL have an affect. I use my PID w/RTD to heat the water to strike temp and then to maintain mash temp. I do try to set the burner to the same BTU setting each time, but I don't get too anal over it. The PID does correct/adjust a little. But it has not been a problem for me. YMMV
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Offline Pi

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Re: PID autotune question
« Reply #3 on: March 13, 2013, 10:20:20 AM »
Make sure you start the auto-tune after you've got the flowrate adjusted and the water around mash temps.
When you say  "around mash temp" can you be more specific? I was thinking of preheating the water to around 110f and going from there.
Primary:Stella Rosemary IPA
Lagering: Sto Lat Gratzer
Drinking: Whenever I'm not working or driving