Anyone know a cheap PID with analog output? - Page 4 - Home Brew Forums
Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Anyone know a cheap PID with analog output?
Sign-up To NEW HBT Article Newsletter - Brewing Articles Direct To You!

Thread Tools
Old 02-05-2011, 01:01 PM   #31
Feedback Score: 0 reviews
Join Date: Oct 2010
Location: Rochester, New York
Posts: 441
Liked 8 Times on 7 Posts
Likes Given: 2


regarding the use of ramping. You may want to use it. If you turn the controller on without ramping, you end up hammering the Controller with a huge error in the beginning. Depending on the response of the system, you could end up with Integral windup. This can cause large overshoots as the system tries to come into control

Derivative can also be used to minimize overshoot. It may take a while to get the gains set for your system, so a couple run throughs with water will help. I didn't read the manual but most controllers have auto tune these days and can help minimize the screwing around generating the right gains.

#1 - 5 Gallons Harp Clone All Grain with Wyeast 2007 Lager (~5.5% ABV)

#1 - 6 Gallons Dry Irish Stout Partial (~4.0 ABV)
#2 - 6 Gallons Brown Sugar Ale All Grain with Nottingham Yeast (~5.0% to 5.2%)

6 Gallons Honey Ale AG

6 Gallons Brown Sugar Lager
RukusDM is offline
Reply With Quote
Old 02-05-2011, 07:19 PM   #32
Senior Member
Feedback Score: 0 reviews
Join Date: Dec 2006
Location: Turner, Oregon, Oregon most of the time now
Posts: 2,305
Liked 53 Times on 47 Posts


A suggestion would be to move the proportional valve to the coolant circuit instead of the wort circuit as it would not catch hop and cold break particles which would be a sanitation "oops" later. As to auto tune, it may or may not work, it depends on the response time to coolant flow change and time to transit heat exchanger to see response at temperature sensor. It is going to be interesting to see how this works as it can not be simulated and tuned before operation.
kladue is offline
Reply With Quote
Old 02-06-2011, 05:30 AM   #33
Feedback Score: 0 reviews
kshuler's Avatar
Join Date: Mar 2010
Location: Seattle, WA
Posts: 310
Liked 7 Times on 6 Posts
Likes Given: 4


Well, thanks everyone for the advice. I will wait until I get all the parts and then give it a whirl. I have 2 brew days coming up this week, but I won't be ready yet to use the setup. It will probably be a month or more before I get the chance again, and I will update as things happen.

Again, thanks everyone!

Originally Posted by Beer_Maker View Post
Light travels faster than sound. This is why some people appear bright until you hear them speak.
You can't reason someone out of a position they didn't reason themselves into.

kshuler is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
PID Relay output driving an SSR? onelegout Brew Stands 9 09-01-2010 03:57 PM
Output Voltage Of Ranco Controller Cold_Steel Fermenters 4 08-19-2010 06:14 PM
Nothing on the output side of my SSR???? Krelja Brew Stands 10 06-22-2010 01:40 PM
SSR Heat Output? RonRock Brew Stands 9 02-08-2010 04:35 PM
Should I move my MLT Output to the bottom? Eigenmusic Kettles, Mash Tuns, & Hot Liquor Tanks 1 09-24-2009 02:01 PM

Forum Jump