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Want to add brew pressure Gauge need Advice
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monza64
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Joined: 26 Apr 2013
Posts: 4
Location: canada
Expertise: I love coffee

Posted Fri Apr 26, 2013, 8:44am
Subject: Want to add brew pressure Gauge need Advice
 

Hello Everyone

I currently own a Izzo Vivi machine that has served me well over the past few years, but I have decided I would like to add a Brew Pressure Gauge to the machine but and a bit confused as to which line I should be tapping into. I have loaded up pictures of the plumbing from each side of the machine. One side you can see the OPV. I presume the line comes from the pump to the OPV and seem to head into the bottom of the boiler (I think) , where it meets up the a line coming from the other side which seems to come from the pumps other end, I assume this is the pressure side. Where should I be tapping into the line?  Any advice would be greatly appreciated, thank you

monza64: Machine 2.jpg
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monza64
Senior Member


Joined: 26 Apr 2013
Posts: 4
Location: canada
Expertise: I love coffee

Posted Fri Apr 26, 2013, 8:45am
Subject: Re: Want to add brew pressure Gauge need Advice
 

Sorry forgot to include the second pic

monza64: Machine1.jpg
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,466
Location: UK
Expertise: I love coffee

Posted Fri Apr 26, 2013, 3:07pm
Subject: Re: Want to add brew pressure Gauge need Advice
 

Why do you want a brew pressure gauge, what for exactly....it's not a stupid question?

The answer determines what exactly you need to do.
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monza64
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Joined: 26 Apr 2013
Posts: 4
Location: canada
Expertise: I love coffee

Posted Fri Apr 26, 2013, 4:42pm
Subject: Re: Want to add brew pressure Gauge need Advice
 

Thanks for getting back to me on this. I guess im looking to use it as more of a measure to if i am in range of 9 bars more or less while brewing. I guess a more exact measurement would be to have a portafilter type gauge.  I was also hoping to be able to check the over all system pressure using a blind occasionally. I dont profess to be an expert in coffee thus just trying to learn more and improve my techniques and equipment in general.  Any info you are willing to share is greatly appreciated
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,466
Location: UK
Expertise: I love coffee

Posted Fri Apr 26, 2013, 5:47pm
Subject: Re: Want to add brew pressure Gauge need Advice
 

OK, that's what I suspected. Well believe me or not the only reason for a brew pressure gauge, is to check the pump output is between 8.5 to 10 bar (range of whatever specific pressure you prefer) against a blind filter. The only reason for a Pressure measuring portafilter, is to check the pump output and in addition a check of preinfusion working correctly and ramp speed of the pump (not so much rotary, but vibration ramp speed).

There is no other reason, not to check whether your coffee is ground right, too fine too course....no. If the pump is at say 9 bar static pressure against a blind filter, the coffee should be grouhnd to the finness required to get a correct extraction e.g. 28 second, about 1oz, no blonding.

You would have a far better diagnostic tool, to purchase a pressure measuring portafilter and use that once a year to check the brew pressure and preinfusion. To fit one to the panel is not really worth it and less valuable as a diagnostic tool, because it can't tell you anything about preinfusion.
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monza64
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Joined: 26 Apr 2013
Posts: 4
Location: canada
Expertise: I love coffee

Posted Fri Apr 26, 2013, 8:32pm
Subject: Re: Want to add brew pressure Gauge need Advice
 

That is some great information you have provided and will definitely take it into consideration. One more reson for the gauge as i have one sitting around so for the cost of a t fitting may be worth throwing it in anyway.  But back to the original question does it matter what side of the 3 way fitting where the tubes meet should the fitting be place. Looking at the machine further i may have answered my own question as i dont think it matters which side long as its as far away from the pump. I guess im looking more for confirmation at this point.
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,466
Location: UK
Expertise: I love coffee

Posted Sat Apr 27, 2013, 2:22am
Subject: Re: Want to add brew pressure Gauge need Advice
 

it doesn't matter where is is as long as it is in the brew circuit, doesn't matter if it is near to the pump, but if you have the gauge why not mount it to a portafilter instead.
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