Home Brew Forums

Home Brew Forums (http://www.homebrewtalk.com/forum.php)
-   Electric Brewing (http://www.homebrewtalk.com/f170/)
-   -   Selecting a PID (http://www.homebrewtalk.com/f170/selecting-pid-199120/)

sambogi76 10-05-2010 02:46 AM

Selecting a PID
 
I am getting ready to upgrade my system with a E-HLT/ future upgrade to HERMS. I am going to use a 4500 - 5500 watt element and I am look at this PID. It comes with a K type thermocoupler but I am looking at a Pt100 sensor for a better resolution.
Is this a good choice?
Any inputs would be appreciated.

passedpawn 10-05-2010 03:11 AM

Looks good, and will probably work. But this model has the ability to drive mechanical relays, and you only need to drive SSR's, right? I think the SSR version of this PID is available straight from Auber Instruments fabout the same $$ as the ebay model. Check it out yourself:

http://www.auberins.com/index.php?ma...&products_id=3

jasonsbeer 10-05-2010 03:15 AM

Appears to be the "standard" Auber PID that a lot of people here have used very successfully.

Probably won't go wrong with that one.

There is also an SSR only version here.

bad coffee 10-05-2010 03:24 AM

I was thinking about this PID, it's programmable! 31 different programs, so you could basically program 31 different beers in it.

Drawback it's about 2x the price and you still need to get temp probes.

http://www.mpja.com/prodinfo.asp?number=18258+MI

B

passedpawn 10-05-2010 03:34 AM

Quote:

Originally Posted by bad coffee (Post 2317891)
I was thinking about this PID, it's programmable! 31 different programs, so you could basically program 31 different beers in it.

Drawback it's about 2x the price and you still need to get temp probes.

http://www.mpja.com/prodinfo.asp?number=18258+MI

B

I took a cursory look at its docs... no obvious "manual mode", which makes boils nearly impossible to control.

sambogi76 10-05-2010 03:41 AM

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?

sambogi76 10-05-2010 03:42 AM

And yes I am looking at a SSR output

passedpawn 10-05-2010 03:49 AM

Quote:

Originally Posted by sambogi76 (Post 2317914)
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?

That looks like a winner. I bet it is functionally identical to the 2352, which is very common around the campus.

If it's identical, you'll find a lot of help. If not, well, you will have to sorta figure it out yourself. Me, I'd go with the crowd. There are a lot of settings on one of these things... some matter, some don't.

sambogi76 10-05-2010 03:53 AM

Can these things be calibrated? Or do they even need to be calibrated?

passedpawn 10-05-2010 04:04 AM

yea, a little bit. There is an offset you can add to the reading. For example, if your PID/sensor says 75F, and you verify by some other method that it should be 72.5F, 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.


All times are GMT. The time now is 06:22 PM.

Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.