Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!


Home Brew Forums > Home Brewing Beer > DIY Projects > Other > Resistive properties of wort?
Reply
 
LinkBack Thread Tools
Old 02-21-2011, 09:08 AM   #1
BrewSpook
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Richmond, VA
Posts: 463
Liked 3 Times on 3 Posts
Likes Given: 1

Default Resistive properties of wort?

As a 30 year old electrical engineering student, I am afforded several things above my 19-20 year old counter parts that force me to ask some serious questions...

The latest being - does beer have a resistive property? My thought being that as the sugar is used during fermentation the conductive property, specifically the impedance of the liquid would change. This would allow for measurements to be taken and some sort of conversion to a SG reading that could be monitored by electric probe.

Has anyone read anything about this?

Initial experiment thoughts would be 1 lb DME in 1gal H2O, lightly hopped and take measurements before and at many points during fermentation matched with hydrometer/refractometer readings and see if there is a potential for relativity between the two.

__________________

Give me a woman who truly loves beer, and I will conquer the world. -- Kaiser Wilhelm II (1859-1941)

Beer makes you feel the way you ought to feel without beer. -- Henry Lawson


My DIY Tap Handles

My RIMs Toolbox

BrewSpook is offline
 
Reply With Quote Quick reply to this message
Old 02-21-2011, 09:19 AM   #2
mattd2
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2009
Location: Papamoa, New Zealand
Posts: 3,579
Liked 269 Times on 214 Posts
Likes Given: 46

Default

Do it!
Would be very interesting to find out more about this. Check out some of the aquerium forums for DIY stuff on conductivity probes, etc.
Keep us in the loop

__________________
mattd2 is offline
 
Reply With Quote Quick reply to this message
Old 02-21-2011, 09:20 AM   #3
mendnwngs
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2011
Location: Napa, CA
Posts: 43
Liked 3 Times on 3 Posts
Likes Given: 3

Default

I've spent a few years working the pharma angle.. Making water to USP standards (DI, or 18 megohm water)

Salts tend to be the big effector for resistance, in my experience.. But... I have no info one way or the other regarding sugars, so I too would be curious.

I would think that in order for a resistive measurement system to work tho, the user would have to measure the resistivity of the source water (after any salts / buffers / gypsum / water additions have been added, and thoroughly dissolved.) to get a baseline reading, and to calibrate for the batch..

But, I could be wrong..

You could build a rig that holds the probes a set distance apart (say 1 cm) then test resistivity of the source water. Then test a wort pre-biol, and post-boil to see if you get different results..

If you do, then perhaps a controlled experiment making a (say 1lb DME in 1 gal water) vs smaller, or larger quantities in the same water source to see if the probe scales readings in a meaningful way.

Sorry if i'm rambling.. Too many homebrews

-Jason

__________________

Respect yeast. (Its the only culture I have!)

mendnwngs is offline
 
Reply With Quote Quick reply to this message
Old 02-21-2011, 09:28 AM   #4
BrewBeemer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2006
Location: island, in an atoll
Posts: 3,510
Liked 21 Times on 21 Posts
Likes Given: 7

Default

Quote:
Originally Posted by BrewSpook View Post
As a 30 year old electrical engineering student, I am afforded several things above my 19-20 year old counter parts that force me to ask some serious questions...

The latest being - does beer have a resistive property? My thought being that as the sugar is used during fermentation the conductive property, specifically the impedance of the liquid would change. This would allow for measurements to be taken and some sort of conversion to a SG reading that could be monitored by electric probe.

Has anyone read anything about this?

Initial experiment thoughts would be 1 lb DME in 1gal H2O, lightly hopped and take measurements before and at many points during fermentation matched with hydrometer/refractometer readings and see if there is a potential for relativity between the two.
I would bet any variation in ph alone would have a greater effect on your conductivity readings than the wort sugar content change.
I've done past testing with the Koi pond water from clean to dirty time to change the water. The ph alone overpowered any readings of importance I was looking for. No plans of making candied Koi.
__________________
BrewBeemer is offline
 
Reply With Quote Quick reply to this message
Old 02-21-2011, 09:30 AM   #5
mattd2
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2009
Location: Papamoa, New Zealand
Posts: 3,579
Liked 269 Times on 214 Posts
Likes Given: 46

Default

The other thing for using this for fermentation monitoring is if the alcohol will effect the resistance/conductivity. But if you could get a menaingful results from experimental data it would be worth it. Even if you can't reach an empherical (is that the right word ) formula, if it gives stable readings you could still use it to determine if fermentation is complete (no change in reading over a few days)

__________________
mattd2 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY wort aeration jedIPA DIY Projects 15 01-21-2012 11:21 PM
Wort Cooler StAnthonyB Chillers and Stir Plates 2 05-06-2010 12:09 AM
Wasted Wort gwynclan Brew Stands 5 03-15-2010 07:51 AM
BCS-460 Issue changing the temperature in state properties TimWeber Brew Stands 2 03-08-2010 02:39 PM
Co2 Wort Chiller Chilkoot Chillers and Stir Plates 26 04-02-2008 05:33 AM



Newest Threads

LATEST SPONSOR DEALS