While the gauge is not accurate in absolute terms, it is accurate in relative terms. You can set it at 9 today and it will read 9 tomorrow. So it does give you a simple way to adjust pressure up or down a known amount, even though you may not know the exact pressure you wind up with. You may start at 9 on the gauge, 8 actual, and increase by 1 bar. Then you'd have 10 on the gauge, 9 actual. You'll have to tweak until you find what you like, then can leave it alone--not something that you need to worry about very much unless it's waaaaay off. bmc "Faith will move mountains, but you'd better bring a shovel....."
> From: shixx <[email protected]> > Reply-To: <[email protected]> > Date: Mon, 16 Feb 2009 03:48:46 -0800 (PST) > To: Brewtus <[email protected]> > Subject: Re: Adjusting pressure > > > yes, the guage is mostly for decorative and entertainment purposes. > > > > On Jan 28, 11:58 pm, Chris Bailey <[email protected]> wrote: >> Ok, read that thread. I guess what's strange to me is that, the gauge is >> almost pointless. I suppose it's useful to know if something has gone >> really wrong, but otherwise you can't really use it to adjust or to fine >> tune your pressure. It's just a little misleading to me I guess. >> >> >> >> On Wed, Jan 28, 2009 at 8:03 PM, TWG <[email protected]> wrote: >> >>> 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 - >> >> -- >> Chris Bailey >> [email protected] > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Brewtus" group. 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