Oh, and TWG - I agree, the gauge is indeed better than nothing, as I vaguely implied, it's helpful to know whether something has gone wrong or not, or whether things are behaving consistently. No doubt I love my machine, and the better I know it, the better it is.
On Thu, Jan 29, 2009 at 8:33 AM, Chris Bailey <[email protected]>wrote: > Ok, thanks Todd, good to know. I will dial it down a bit. Yes, 11.5 bar > when with blind, and more like 10 I think when brewing, which is consistent > with what you mentioned. I'll try it out with my next shot and see how it > goes. > > > On Thu, Jan 29, 2009 at 8:25 AM, Todd Salzman <[email protected]>wrote: > >> >> 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 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] > -- Chris Bailey [email protected] --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
