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Extraction Pressure and altitude
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telepilot
Senior Member


Joined: 7 Jan 2010
Posts: 3
Expertise: I love coffee

Posted Wed Apr 3, 2013, 1:42pm
Subject: Extraction Pressure and altitude
 

I have a technical question. My new Breville Dual Boiler only hits 7 on the extraction pressure gauge. I think it's supposed to get up to 9. So,here's the deal,  I live at 11,100 feet. Would that altitude affect the extraction pressure? And if I'm only hitting 7, how might that affect my shot quality? Is there an adjustment I can make to get it up to 9?

Thanks, just learning this machine.

Tim
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,842
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Apr 3, 2013, 1:56pm
Subject: Re: Extraction Pressure and altitude
 

Short answer, no the altitude will not affect brew pressure, it is a closed system and ambient pressure does not affect it.

Yes it is supposed to be 9 bar, if your coffee is not ground properly, you  may not be developing enough back pressure through the puck, what grinder do you have, fresh coffee is also very important, if it is older than two weeks SINCE THE DAY IT WAS ROASTED, then it is getting very old for espresso and older dry coffee does not brew properly as well as tastes stale.

Breville made the machines to not be user friendly when it comes to repairs, I am sure if you open it up, you will void the warranty. So far, the BDB seems to be getting along OK by reports of people here that have them though there has been more than a few "issues" with them. I am not fond of the manufacturer as nearly all of the other products that they make are through away kitchen appliances and not high quality equipment. The owners of the BDB here are hard core supporters of the machine but I neither like it or dislike it. I would not buy one but like I said, the owners here are hard core lovers of it.

Good luck and you might have a better answer to your question if you take it up in the BDB owners thread. http://coffeegeek.com/forums/espresso/machines/555671

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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CSME9
Senior Member
CSME9
Joined: 26 Feb 2004
Posts: 287
Location: West Texas
Expertise: I live coffee

Espresso: Bezzera Mitica Top, Spaz...
Grinder: Rancilio Rocky
Drip: Moka Pot
Roaster: BBQ Roaster
Posted Wed Apr 3, 2013, 2:09pm
Subject: Re: Extraction Pressure and altitude
 

telepilot Said:

I have a technical question. My new Breville Dual Boiler only hits 7 on the extraction pressure gauge. I think it's supposed to get up to 9. So,here's the deal,  I live at 11,100 feet. Would that altitude affect the extraction pressure? And if I'm only hitting 7, how might that affect my shot quality? Is there an adjustment I can make to get it up to 9?

Thanks, just learning this machine.

Tim

Posted April 3, 2013 link

Pull a shot with the backflush disk, what does brew pressure read ? If still 7 you need to adjust the OPV, if pressure is 9-10 then you need to grind finer or use fresh roasted coffee or both.
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