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$10 portafilter brew pressure gauge
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Discussions > Espresso > Machines > $10 portafilter...  
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cannonfodder
Senior Member
cannonfodder
Joined: 14 Dec 2004
Posts: 873
Location: Dayton, Oh
Expertise: I live coffee

Espresso: ElektraA3,Faema2G, Isomac,...
Grinder: Cimbali, Mazzer
Vac Pot: Dont smoke pot or vac it.
Drip: Press pot
Roaster: Hottop, drum roaster
Posted Fri Feb 10, 2006, 7:32pm
Subject: Re: $10 portafilter brew pressure gauge
 

I added an onboard pressure gauge to my Isomac. I have it documented on HB and on my blog.

Click Here (www.home-barista.com)

 
Dave Stephens
www.home-barista.com
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poison
Senior Member
poison
Joined: 11 Aug 2004
Posts: 1,163
Location: LA
Expertise: I live coffee

Espresso: Astra Pro
Grinder: Maestro Plus, Super J deal
Drip: Cone filter
Roaster: RK drum
Posted Sat Feb 11, 2006, 9:02am
Subject: Re: $10 portafilter brew pressure gauge
 

andretti, nice fix. I'll have to see what I can do...

BTW, are you a Ferrari driver? :-)
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andretti
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andretti
Joined: 22 Feb 2005
Posts: 91
Location: Netherlands
Expertise: I like coffee

Espresso: Fiorenzato Bricoletta....
Grinder: Mazzer Mini. Before: Gaggia...
Posted Sun Feb 12, 2006, 4:17pm
Subject: Re: $10 portafilter brew pressure gauge
 

poison Said:

andretti, nice fix. I'll have to see what I can do...

BTW, are you a Ferrari driver? :-)

Posted February 11, 2006 link

In my dreams! Or no.... In my dreams I drive a La Marzocco...
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leoz
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Joined: 14 May 2006
Posts: 279
Location: CT
Expertise: I love coffee

Espresso: ECM Giotto P, Elektra MCAL
Grinder: macap m4 stepless
Vac Pot: Press Pot - Bodum
Drip: Cuisinart DBG600
Roaster: Hot Top
Posted Thu Jun 15, 2006, 6:27am
Subject: Re: $10 portafilter brew pressure gauge
 

Ozark/Geoff:
Did you get a PF wit gauge?  im looking to do this mod to one of my PF's but would like a frame of reference for how much the OPV will be getting turned.  You have a giotto, right?

Also, does anyone have a pic of where the valve is?  I remember reading that it is adjustable, but the adjusting screw is under something, or, behind another fitting?  Im hoping this explains the bitterness my shots are experiencing..
thx!

ive found plenty of info.. thanks!
heres some cross referencing in case someone else needs it:

Click Here (www.home-barista.com)
"Help Me Adjust Overpressure Valve on a Giotto Premium"
"How to adjust the brew pressure of a Giotto Premium"
"Adjusting vibe pump pressure on HX machines"
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coder58
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Joined: 20 Dec 2007
Posts: 10
Location: USA
Expertise: I love coffee

Espresso: QM Andreja, Silvia v2,...
Grinder: Barista, Macap M4
Vac Pot: Japanese Thermo Siphon,...
Drip: Delonghi
Roaster: SR500 mod
Posted Thu Dec 20, 2007, 9:09pm
Subject: Re: $10 portafilter brew pressure gauge
 

Hi,
I assume your PF is same size as the Andreja's (58mm)? I want to rig one of my own. Although the Andreja is equipped with one, I suspect I am having a pressure problem so I want to test it right where it comes out...
Thanks.
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coffee_no_sugar
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Joined: 15 Jan 2005
Posts: 352
Location: USA
Expertise: I love coffee

Espresso: pavoni pub, brasilia club
Grinder: mazzer sj, mdf, infinity
Drip: melitta clarity
Roaster: popcorn
Posted Sun Dec 23, 2007, 5:52am
Subject: Re: $10 portafilter brew pressure gauge
 

Hi,

  Has anyone tried taking the pressure measurement from the steam wand?  You may only need a VERY STRONG hose, two hose clamps and a pressure gauge.  The advantage is that you could see the pressure while brewing.

      Wesley
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fad
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fad
Joined: 19 Apr 2003
Posts: 633
Location: Sydney, Australia
Expertise: I live coffee

Espresso: Grimac La Uno, Isomac...
Grinder: Mazzer SJ. Cunill...
Vac Pot: Bodum Santos
Drip: SwissGold
Roaster: Ron Kyle BBQ Drum,...
Posted Sun Dec 23, 2007, 5:39pm
Subject: Re: $10 portafilter brew pressure gauge
 

coffee_no_sugar Said:

Hi,

  Has anyone tried taking the pressure measurement from the steam wand?  You may only need a VERY STRONG hose, two hose clamps and a pressure gauge.  The advantage is that you could see the pressure while brewing.

      Wesley

Posted December 23, 2007 link

Two points:
- the pressure in the steam wand is going to be (at best) 1.5 bar, versus 8-13 bar in the portafilter.
So you don't need a very strong hose.

- taking pressure readings from the steam wand might be interesting, but bear NO relation to the pressure
you're pushing through the coffee.

The "modern" style espresso machines were designed to specifically get away from pushing steaming
water through coffee. So the  espresso head and steam arm have different feeds internally, they
aren't all connected up together.

Cheers

Paul Haddon
Sydney, Aus
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coffee_no_sugar
Senior Member


Joined: 15 Jan 2005
Posts: 352
Location: USA
Expertise: I love coffee

Espresso: pavoni pub, brasilia club
Grinder: mazzer sj, mdf, infinity
Drip: melitta clarity
Roaster: popcorn
Posted Sun Dec 23, 2007, 8:28pm
Subject: Re: $10 portafilter brew pressure gauge
 

fad Said:

Two points:
- taking pressure readings from the steam wand might be interesting, but bear NO relation to the pressure
you're pushing through the coffee.

Posted December 23, 2007 link

Paul,

  Good point, it wouldn't work with hx or dual boilers.  How about an old-fashioned Gaggia or Silvia?

   Wesley
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fad
Senior Member
fad
Joined: 19 Apr 2003
Posts: 633
Location: Sydney, Australia
Expertise: I live coffee

Espresso: Grimac La Uno, Isomac...
Grinder: Mazzer SJ. Cunill...
Vac Pot: Bodum Santos
Drip: SwissGold
Roaster: Ron Kyle BBQ Drum,...
Posted Sun Dec 23, 2007, 11:42pm
Subject: Re: $10 portafilter brew pressure gauge
 

coffee_no_sugar Said:

Paul,

  Good point, it wouldn't work with hx or dual boilers.  How about an old-fashioned Gaggia or Silvia?

   Wesley

Posted December 23, 2007 link

Hmm.. possibly. But then you're skewing the result by allowing some of the pressure to go elsewhere
than the portafilter.

It is possible to measure shot pressure during extraction, but it's not quite as simple as screwing
a gauge into the steam arm, alas.

Cheers

Paul Haddon
Sydney, Aus
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RapidCoffee
Senior Member
RapidCoffee
Joined: 4 Dec 2004
Posts: 1,931
Location: Rapid City, SD
Expertise: I love coffee

Espresso: La Spaziale S1
Grinder: Mazzer Robur
Vac Pot: Yama
Drip: misc
Posted Mon Dec 24, 2007, 12:24am
Subject: Re: $10 portafilter brew pressure gauge
 

coder58 Said:

I assume your PF is same size as the Andreja's (58mm)? I want to rig one of my own. Although the Andreja is equipped with one, I suspect I am having a pressure problem so I want to test it right where it comes out...

Posted December 20, 2007 link

The QuickMill Andreja Premium and Vetrano models are quite similar, except that the Vetrano is a plumbed rotary pump machine. So yes, I'm sure my PF gauge would work with your AP. You might want to spring for a glycerin-filled gauge to eliminate potential oscillations from your vibe pump.

coffee_no_sugar Said:

Has anyone tried taking the pressure measurement from the steam wand?  You may only need a VERY STRONG hose, two hose clamps and a pressure gauge.  The advantage is that you could see the pressure while brewing.

Posted December 23, 2007 link

Been done, see here. As noted, this gives you boiler pressure, not brew pressure on an HX machine.
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