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Home Brew Forums > Home Brewing Beer > Electric Brewing > Selecting a PID
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Old 10-05-2010, 04:10 AM   #11
sambogi76
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yea, a little bit. There is an offset you can add to the reading. For example, if your PID/sensor says 75°F, and you verify by some other method that it should be 72.5°F, you can enter -2.5 into the offset register in the PID. It will read correctly then.

There is also an "autotune" feature in which it learns how fast your system reacts to input. You do this one time, after your system is set up. It's easy and keeps the system from overshooting the temp you set. More on that in other threads.
That sound pretty cool. I thought that this PID was the norm around here, but just wanted to double check before I bought it. I am very excited about this upgrade and the fact that I will be just a step away from a HERMS.
Thank you for the help.


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Old 10-05-2010, 04:17 AM   #12
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Good luck. BTW, cute pic of daughter. I have one of those too.


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Old 10-05-2010, 12:52 PM   #13
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Just out of curiousity, what's the PWM period on these PIDs? Can you change it?
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Old 10-05-2010, 01:07 PM   #14
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You can change it. I can't remember what the default was, maybe 2 seconds. I changed mine down to 0.5s and had problems. It has been set to 1s for all of my brews.

[edit] upon further review, I think mine is set to 2 seconds now. ]
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Old 10-05-2010, 01:18 PM   #15
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What were the symptoms with 0.5s?
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Old 10-05-2010, 01:27 PM   #16
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What were the symptoms with 0.5s?
This was before I had it in my system... I had it on a bench with a scope probe tied to it.

Here's the thread I made about it... looks like I have it set to 2 seconds, oops.

http://www.homebrewtalk.com/f51/aube...ed-bug-145013/
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Old 10-05-2010, 10:27 PM   #17
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Good luck. BTW, cute pic of daughter. I have one of those too.
Thank you, Yea she is my baby, dont let her looks fool you... She is rotten.
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Old 10-23-2010, 03:00 AM   #18
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It appears that this PID can be either SSR and relay output and it is a few dollars cheaper and the resolution can go down to .1F with pt100 sensor. IM I right?
Those are the exact PIDs I have for both my HLT and BK. I've only run several wet tests so far, and no brewing, but they are fully capable of taking care of your brewing needs. They are easy to program as far as inputs or temp offsets, etc, too. I ran two separate auto tune functions with both PIDs, and they were set in about 25 minutes. It also easily bumps from PID mode to manual mode.

FYI, I didn't have to calibrate my PT100 sensors at all. They were dead on. I also used panel mount connectors on my control panel that you can get from Auber Instruments as well; I highly recommend that.

Here you can see in the upper right corner the panel mount RTD connectors.


Here's a shot of the PIDs in action. Note the temp probes were not submerged in water at the time; they are much more responsive when submerged.


Hope this helps,
TB


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