Search this group with the terms: Calibrating Brew Pressure This should help clarify the difference between the pressure shown on the Brewtus guage versus the pressure in the portafilter. 11.5 on the Brewtus guage may be a bit high but not way out of line.
On Jan 28, 10:36 pm, Chris Bailey <[email protected]> wrote: > Just confirmed, with a blind PF in, it holds steady at 11.5 bar on my gauge. > > On Wed, Jan 28, 2009 at 7:33 PM, Chris Bailey <[email protected]>wrote: > > > > > > > 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 <[email protected]> > >> *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 problematic > >>> after adjusting the pressure. > >>> The first of the BII had teflon as well. They were later switched to > >>> an opv with a brass adjusting screw. I replaced mine with one of these > >>> after I had problems with my original teflon screw opv on my BII. > >>> Strangely enough, Expobar has again gone back to using an opv with a > >>> teflon screw on the new BIII machines. > >>> I would say go ahead and adjust it, especially if it is a brass > >>> screw. If it is teflon, be prepared to "possibly" have some future > >>> problems 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 to > >>> 9 on the guage. > >>> Check again when you actually pull a shot that it is around 8.5. I > >>> will 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 Bailey > >> [email protected] > > > -- > > Chris Bailey > > [email protected] > > -- > Chris Bailey > [email protected] Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Brewtus" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/brewtus?hl=en -~----------~----~----~----~------~----~------~--~---
