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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 699
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Apr 25, 2013, 9:39am
Subject: Re: Aerobie Aeropress
 

AlanAdler Said:

Brix vs Time

I brewed at 195F in order to exacerbate temperature errors.  I put a drop in the Brix meter well and recorded readings every half-minute.  Note that the readings were flat (Brix = 3.3) from one half minute to 3.5 minutes.

After 3.5 minutes I'm sure that the sample had cooled to room temperature, but the Brix reading still began to increase -- presumably due to evaporation.

As I posted earlier, I take the first two repeats as the reading.  In this case 3.3.

Best,

Alan

http://coffeegeek.com/images/61196/Brix.jpg

Posted April 24, 2013 link


If there was evaporation after the sample cooled surely there was evaporation when it was hot. I'm not sure what's going on, but given the precision of your instrument your data fit a linear increase reasonably well. Look at the attached graph. The error bars denote the precision of your refractometer.

If the increase is due to evaporation it is at the rate of ~1% loss of solution per minute. Your PAL-1 can't resolve that which is why it takes several minutes for the reading to change. I have done evaporation tests before as I was concerned about errors when weighing small liquid coffee samples. I came to the conclusion that at room temperature the evaporation rate for my circumstance was insignificant but it was a source of error if the coffee was hot. So I cool the samples in closed containers.

Why don't you try doing it the way that VST recommends for their refractometers? They suggest putting several milliliters into a room temperature shot glass to quickly cool the liquid, waiting 1 minute, transfering the fraction of a ml needed to fill the sample well, and then waiting another 30 seconds. See if it makes any difference.

jpender: 3505019.jpg
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Thu Apr 25, 2013, 9:50am
Subject: ...
 

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AlanAdler
Senior Member
AlanAdler
Joined: 31 Dec 2005
Posts: 708
Location: Palo Alto, Calif
Expertise: Professional

Espresso: AeroPress
Grinder: Baratza - Virtuoso
Roaster: Fresh Roast SR-500
Posted Thu Apr 25, 2013, 4:23pm
Subject: Re: Aerobie Aeropress
 

jpender Said:

Why don't you try doing it the way that VST recommends for their refractometers? They suggest putting several milliliters into a room temperature shot glass to quickly cool the liquid, waiting 1 minute, transfering the fraction of a ml needed to fill the sample well, and then waiting another 30 seconds. See if it makes any difference.

Posted April 25, 2013 link

Yes.  That's what I previously described.  But I used my aluminum sample block (pic below) instead of a shot glass.  

"Re: Aerobie Aeropress"

Each of the larger cavities holds 0.45 g.  I repeated this again today with the same result.

Best,

Alan

AlanAdler: Sample Block.jpg
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 699
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Apr 25, 2013, 5:05pm
Subject: Re: Aerobie Aeropress
 

AlanAdler Said:

Yes.  That's what I previously described.  But I used my aluminum sample block (pic below) instead of a shot glass.  

"Re: Aerobie Aeropress"

Each of the larger cavities holds 0.45 g.  I repeated this again today with the same result.

Posted April 25, 2013 link

So it sounds like cooling and evaporation are not a big deal provided you measure as soon as the readings stabilize. Just as you suspected!
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Netphilosopher
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Expertise: Just starting

Posted Fri Apr 26, 2013, 4:57am
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CaptainCowPie
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CaptainCowPie
Joined: 12 Dec 2005
Posts: 71
Location: Charlottesville, VA
Expertise: I live coffee

Espresso: Mypressi Twist
Grinder: Super Jolly
Vac Pot: Not Yet
Drip: Aeropress & Bonavita...
Roaster: Heat Gun / Bread Machine
Posted Fri Apr 26, 2013, 6:25am
Subject: Re: Aerobie Aeropress
 

Netphilosopher Said:

...

Posted April 26, 2013 link


I love following this topic for many reasons, one of them being that I have to actually use all that math I took in college ;)

Vince
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Netphilosopher
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Location: USA
Expertise: Just starting

Posted Fri Apr 26, 2013, 7:07am
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paulbel
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paulbel
Joined: 26 Apr 2008
Posts: 152
Location: Vancouver, BC, Canada
Expertise: I love coffee

Espresso: aeropress
Grinder: conical burr (cuisinart)
Drip: sometimes
Posted Sat Apr 27, 2013, 12:04pm
Subject: Re: Aerobie Aeropress
 

I've been moaning that my basic Cuisinart conical burr grinder doesn't go as fine as I used to get by overgrinding with my old whirly, but today I did an experiment: using my Kaffeologie screen with an AP paper filter added. Here's what got caught by the paper after the screen.

paulbel: AP_filterandscreen.jpg
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AlanAdler
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AlanAdler
Joined: 31 Dec 2005
Posts: 708
Location: Palo Alto, Calif
Expertise: Professional

Espresso: AeroPress
Grinder: Baratza - Virtuoso
Roaster: Fresh Roast SR-500
Posted Mon Apr 29, 2013, 4:58pm
Subject: Re: Aerobie Aeropress
 

Prototype AeroPresses:

We had a request from Europe for a pic of me with some of the AeroPress prototypes which I machined and tested prior to settling on the current design.

This is only some of them.  Note the bicycle pump and the squeeze bulb!

Best regards,

Alan

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paulbel
Senior Member
paulbel
Joined: 26 Apr 2008
Posts: 152
Location: Vancouver, BC, Canada
Expertise: I love coffee

Espresso: aeropress
Grinder: conical burr (cuisinart)
Drip: sometimes
Posted Mon Apr 29, 2013, 5:03pm
Subject: Re: Aerobie Aeropress
 

Very cool. garage invention lives.

I have harboured an image of a version of the Aeropress with a Pavone-like lever.
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