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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 711
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Wed Apr 2, 2014, 2:31pm
Subject: Re: Aerobie Aeropress
 

AlanAdler Said:

Recently I bought a few IR thermometers.  Their instructions say they are not accurate on liquids, but I found one ("Extech Dual Laser") which could be adjusted to read liquids accurately.  It's no faster than dipping a thermocouple, but a tad cleaner.

Posted March 31, 2014 link

That sounds like a fun toy. How accurate is it? Their website says 1C repeatability and 2.5C accuracy.
What's the emissivity of coffee?
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AlanAdler
Senior Member
AlanAdler
Joined: 31 Dec 2005
Posts: 709
Location: Palo Alto, Calif
Expertise: Professional

Espresso: AeroPress
Grinder: Baratza - Virtuoso
Roaster: Fresh Roast SR-500
Posted Wed Apr 2, 2014, 9:24pm
Subject: Re: Aerobie Aeropress
 

jpender Said:

That sounds like a fun toy. How accurate is it? Their website says 1C repeatability and 2.5C accuracy.
What's the emissivity of coffee?

Posted April 2, 2014 link

I don't know how accurate it is.  I simply turned the emissivity adjustment until it read the same as my thermocouple with approximately 175F water.

This link Click Here (www.omega.com)
says that the emissivity of water at 100F (38C) is 0.67.  American coffee is 98.7% water.

Another source says e=0.96 at "ambient" temperature.

Click Here (www.eumetcal.org)
A scary graph showing wild changes in emissivity between wavelengths of 2 and 4 microns.

All of this suggests that the makers are right to discourage its application to liquids.  Perhaps I should return to dipping a thermocouple.

Best,

Alan
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 711
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Apr 3, 2014, 9:22pm
Subject: Re: Aerobie Aeropress
 

AlanAdler Said:

I simply turned the emissivity adjustment until it read the same as my thermocouple with approximately 175F water.

Posted April 2, 2014 link

What emissivity was that?
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AlanAdler
Senior Member
AlanAdler
Joined: 31 Dec 2005
Posts: 709
Location: Palo Alto, Calif
Expertise: Professional

Espresso: AeroPress
Grinder: Baratza - Virtuoso
Roaster: Fresh Roast SR-500
Posted Tue Apr 8, 2014, 3:44pm
Subject: Re: Aerobie Aeropress
 

jpender Said:

What emissivity was that?

Posted April 3, 2014 link

0.85
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 711
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Tue Apr 8, 2014, 5:25pm
Subject: Re: Aerobie Aeropress
 

AlanAdler Said:

0.85

Posted April 8, 2014 link

Curious. I looked at those links you posted above. The value of 0.67 @ 100F is reproduced on many web sites but I also found web sites that contradicted this and stated that the 100F emissivity is 0.93 or 0.96. That second link I couldn't quite understand but it appears to be a graph of reflectance not emissivity. With zero transmission that would imply emissivity of 0.95 or above regardless of angle of incidence. The IR thermometers I found specs for read in the 8-14m range.

That's interesting that some of the manufacturers warn that measuring liquids might be inaccurate. One maker (Scigene) recommends using a cup of cold water to verify the accuracy of the device!

In the case of your 175F cup of coffee maybe the condensing droplets of steam coming off the surface are affecting the measurement. The steam droplets would be somewhat colder than the coffee. Could that explain why you need to adjust the emissivity downward? I'd love to play with an IR thermometer (or better still an IR camera), but usually I measure my coffee with a cheap probe thermometer. When I want better accuracy I have a $13 thermistor that's good to 0.1C.


I was looking for some information about the Aeropress yesterday and came across this photo:

jpender: aerobie.jpg
(Click for larger image)
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MassWineGuy
Senior Member


Joined: 2 May 2012
Posts: 8
Location: Massachusetts
Expertise: I like coffee

Posted Thu Apr 10, 2014, 1:45pm
Subject: Re: Aerobie Aeropress
 

I just found this thread and while I'm sure I've missed a lot, I'd be grateful for some basic info. I just received an Aeropress as a gift and made a couple of cups this morning. I typically use a 32 oz. French press with about 7 scoops of beans in a 2 TBSP scoop and let it steep for six minutes. I always add milk and sugar, too. I get strong, flavorful, smooth coffee.

After following the written directions and adding water to what the Aeropress brewed, the coffee was pretty good, but blander than I like it. Should I just experiment using more coffee, more water, ? I roast my own beans so I know the coffee is fresh.

Thanks for your help and patience.

Oh, and Alan, I think the Aeropress is one of the absolute most elegant, sparse and functional devices I've ever seen.
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paulbel
Senior Member
paulbel
Joined: 26 Apr 2008
Posts: 153
Location: Vancouver, BC, Canada
Expertise: I love coffee

Espresso: aeropress
Grinder: conical burr (cuisinart)
Drip: sometimes
Posted Thu Apr 10, 2014, 1:55pm
Subject: Re: Aerobie Aeropress
 

Welcome, MassWineGuy!

The Aeropress works best with finer grinds, shorter immersion times (and, arguably cooler water) and tends toward smoother coffee in my experience. If you're finding it bland that may be because you like the kind of flavour you get from letting the grounds sit in the water in the French Press for a rather long time.

I'd suggest starting with getting your grind as fine as possible. Then, increase the stirring and pressing time (and that might entail using hotter water). Try adding less hot water at the end.  And finally experiment with the roast. I personally find the AP shines with lighter roasts, but that might not be to your taste.
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rasqual
Senior Member
rasqual
Joined: 29 Jun 2005
Posts: 1,071
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Thu Apr 10, 2014, 5:20pm
Subject: Re: Aerobie Aeropress
 

Wow, thanks for posting that picture. It led me to this great article.

http://priceonomics.com/the-invention-of-the-aeropress/

Heheh. The lead picture is inverted.

LOL
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paulbel
Senior Member
paulbel
Joined: 26 Apr 2008
Posts: 153
Location: Vancouver, BC, Canada
Expertise: I love coffee

Espresso: aeropress
Grinder: conical burr (cuisinart)
Drip: sometimes
Posted Thu Apr 10, 2014, 6:16pm
Subject: Re: Aerobie Aeropress
 

Thanks for the pointer, rasqual! That was fun to read.
And I had no idea this was the talkin'est topic in CoffeeGeek.
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 711
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Thu Apr 10, 2014, 6:31pm
Subject: Re: Aerobie Aeropress
 

I like that picture of the somewhat younger and also somewhat more haired Adler tossing his iconic flying disk. That is very much like the Aeropress, although one can't literally toss it (as much as I wish it were otherwise).

I have accidentally clicked on the first page of this thread many times and re-read Zeb Wagner's initial post. It more or less said it all in just a few hundred words.

Just a flick of the wrist.
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