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Hi guys, I don't think I said that the gauge does not read
correctly. I was just trying to say that
with a blind filter basket we set them at 10 bar. This means that when you
brew with a proper
grind and coffee at about 2oz in 25 seconds the brew pressure should read
around 8.5 on the gauge. This means the
other 1 to 1.5 bar of pressure is being diverted to the reservoir from the OPV,
so that the gauge is actually reading the brew pressure accuratly.
When we do our set up on the machine we actually don't
use a blind basket, we use a portafilter with a gauge and the pressures are
always very close.
If you are at 11.5 with a blind portafilter you are to
high put the blind basket in and dial it back to 10 bar. This is a good
starting point.Todd Whole Latte Love
This was one of my worries, was that the pressure gauge wasn't
accurate, and then as per Todd's note that what the gauge reads isn't
necessarily what the actual pressure is. That is pretty poor in my
opinion - why bother putting a gauge on there if it's going to be
wrong. But, alas, that's what we have. This is one reason I'm nervous
to monkey with it, as it's hard to say whether it's really wrong or
not, it just surprised me that mine consistently reads 11 bar (with
blind PF or when pulling shots). I'll verify that in a few minutes,
but pretty sure.
I'm grinding, tamping, etc. as per standards AFAIK: 30lb
tamp, grounds typically around 15g in the double basket, grind setting
such that my shots are typically in the 25-30 second range from the
time I pull the lever to when I've filled a cup approx 1.5oz by volume
(I mostly pull shots by where it fills to on my cups, but have measured
this and it's right about 1.5oz). I've read a fair bit, practiced a
ton, use only fresh beans (3 to maybe at most 9 days after roast date),
grind on a nice Macap grinder, etc. I've had a friend who's pulled a
ton of shots use my machine as well.
On Wed, Jan 28, 2009 at 7:05 PM, <[email protected]> wrote:
Also be aware that the pressure gauge on the
Brewtus II can be wrong. I went to considerable effort and expense to more or
less establish (to the degree that the large pressure gauge that I bought is
accurate. It was sold with the statement that it has an accuracy of 1%) that
the
pressure gauge on my machine is two bar off. I wrote about this at the
time on this group, so you might be able to find it with a
search.
Allen
From: Chris Bailey
Sent: Wednesday, January 28, 2009 4:56 PM
To: [email protected]
Subject: Re: Adjusting pressure
My screw looks like it's metal, and is located on the front of
the machine, lower right corner, once you've removed the drip tray. Sound
right? I do tamp to 30lbs. I'll use the blind PF to set the
pressure, thanks for that info!
On Wed, Jan 28, 2009 at 5:46 PM, BinBakinBeans <[email protected]>
wrote:
Which
version of Brewtus?The first had a teflon screw on the opv valve that
became problematicafter adjusting the pressure.The first of the BII
had teflon as well. They were later switched toan opv with a brass
adjusting screw. I replaced mine with one of theseafter I had problems
with my original teflon screw opv on my BII. Strangely enough,
Expobar has again gone back to using an opv with ateflon screw on the new
BIII machines. I would say go ahead and adjust it, especially if it
is a brassscrew. If it is teflon, be prepared to "possibly" have some
futureproblems with it. Not a big deal to change it out if you do.Use
the blind filter in the portafilter to get it down to about 8.5 to9 on the
guage.Check again when you actually pull a shot that it is around 8.5.
Iwill assume that you will have properly tamped to about 30 pounds.
On Jan 25, 12:27 pm, Chris Bailey <[email protected]>
wrote:> I've seen a fair bit of talk on the list about adjusting
pressure. Given> the fact that there's tape over the pressure
adjust screw on my machine, and> all the warnings about don't touch it,
only let the factory do it, etc,> etc., I'm leery of messing with it.
Also, my understanding is that> supposedly the factory has pulled
shots and checked the pressure and set it> properly.> But, I've
just wondered about it. My pressure gauge typically reads about>
11 bar when I'm pulling shots. I'm unclear on whether it's supposed to
read> the true 8.5-9 bar that an espresso should be done at, or whether
the gauge> is a pressure at a different point in the system and thus
the real pressure> at the PF is lower, or not.>> Can
folks discuss this a bit? Other than taste, are there ways for me
to> know whether my machine is set right or not, and/or if I'm going to
adjust> it (and potentially void my warranty?) how can I know when I've
set it to> the right spot? From the reading I've done I think I
understand that too> much pressure can actually cause a build up and
not get things flowing> properly (which seems a bit backwards, but I
sort of understand).>> Anyway, let me know what folks
think.>> --> Chris Bailey> [email protected]
Chris [email protected]
-- Chris [email protected]
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