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Old 10-07-2013, 12:29 PM   #11
Schlomo
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Good News! Did a double batch this weekend, and the new cals worked very well. I was off +/- 3 degrees on my mash, it would go over by 2-3 and then under by 2-3 so it was much better than the previous cals that would overshoot by about 10-15 degrees. Next step is to replace my small diameter coil in my HLT with a 1/2 coil.

I'll be replacing that and brewing again on Sunday, and I'll give another update on here with how much of an impact the smaller diameter coil had on my system.

Cheers

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Old 10-08-2013, 03:13 AM   #12
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Did you auto tune after you adjusted p, i, and d? What values did you end up entering?

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Old 10-08-2013, 12:57 PM   #13
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I did not auto tune after. I used P=5, I= 20, and D = Off

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Old 11-03-2013, 01:10 AM   #14
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I've made changes to my setup and I've tested a few batches on it since. I get spot on temperatures within 1 degree for the whole mash. I also use it to recirculate after boil and i get to pitch temp in about 15 minutes. I love the larger diameter coil, i went with a 1/2" ID copper coil.

Just moving which temperature was being monitored from the outlet of the MLT to the HLT made all the difference.

Cheers.

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Old 11-03-2013, 01:25 PM   #15
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Just so I understand correctly, because my setup is similar to yours:

You are recirculating the HLT water and your PID is measuring the temp at the point where this exits?
And you are just manually measuring the output to the HERMS coil to make sure it is the same as the HLT?

On a side note, I also have a little tan pump but have not used it yet to recirculate the HLT, do you just open the ball valve all the way when you are recirculating?

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Old 11-03-2013, 01:59 PM   #16
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Quote:
Originally Posted by cank View Post
You are recirculating the HLT water and your PID is measuring the temp at the point where this exits?
And you are just manually measuring the output to the HERMS coil to make sure it is the same as the HLT?

On a side note, I also have a little tan pump but have not used it yet to recirculate the HLT, do you just open the ball valve all the way when you are recirculating?
Yes and yes.

My whole process is to add the water I need for the mash to the MLT and fill my HLT (5 gallons) and I will recirculate through the HLT until the MLT and HLT read my mash in temperature (for me 10 deg above my target temperature). After mash in this usually puts me 2-3 degrees below my target which is enough to bring down the HLT water to my target mash temp and my MLT water to my target.

For my system, my HLT water needs to be 3 degrees above what my desired mash temperature is for the water returning to my MLT to be at desired mash temperature.

I researched the other "Big" HERMS setups on HBT for a few weeks before I came up with my system. There are those who measure the output of their mash, the output of the HLT, and the temperature after the heat exchanger. I've found that my setup works best for me, and I would recommend it to others as well. I will say, however, that it depends on what hardware you are using to determine exactly what the best approach for you.

Side Note. I open my HLT recirc pump all the way.
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Old 11-03-2013, 02:48 PM   #17
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I understand why your first attempt (pid probe at the mash tun output) didn't work and that the current way should be much better, but have you tried it with the pid probe at the herms coil output?

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Old 11-03-2013, 03:36 PM   #18
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Quote:
Originally Posted by kevink View Post
I understand why your first attempt (pid probe at the mash tun output) didn't work and that the current way should be much better, but have you tried it with the pid probe at the herms coil output?
I did think of that as well, but since I'm using a cooler for a MLT, i lose heat very slowly. I havent tried it, but I would bet if it was there I would overshoot my temperatures.

Being as it works perfectly for my setup now, I probably wont try moving it and risk another batch having rampant temperatures.

That was, however, my second experiment if the first attempt didnt work.
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