Zero cost adapter for portafilter pressure gauge - Page 2

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Peppersass
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Joined: Tue Jul 21, 2009 3:54 am

Postby Peppersass » Thu Sep 13, 2012 3:35 am

Bear in mind that this device doesn't tell you the brew pressure. It tells you the pressure against a blind basket. That will be greater than the brew pressure. To get the brew pressure, the device has to duplicate the flow rate of water running through the puck. You can do that with a needle valve, but it's quite challenging to adjust the flow rate. The Scace II uses a mesh plug and a tiny drilled hole to regulate the flow.
Dick Green

espresso machines, grinders, brewing equipment & parts
tonto
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Joined: Sun Dec 16, 2012 7:32 pm

Postby tonto » Tue Jan 22, 2013 2:22 am


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erics
Posts: 4914
Joined: Tue Aug 09, 2005 6:32 am

Postby erics » Tue Jan 22, 2013 3:14 am

can you repurpose one of these?

No. Those have an orifice size of ~0.035" whereas the proper size is ~0.012"-0.013".
Skål,

Eric S.
http://users.rcn.com/erics/
E-mail: erics at erols dot com

Beenbag
Posts: 332
Joined: Sat Nov 24, 2012 1:57 am

Postby Beenbag » Tue Jan 22, 2013 7:48 am

you could solder the hole shut and carfully redrill it to a suitable size.
..bearing in mind the low cost nature of this project. !

GlennV
Posts: 55
Joined: Mon Aug 29, 2011 10:57 am

Postby GlennV » Tue Jan 22, 2013 11:55 am

DellOrto 1486 carb jets go down to a size 30 (which is 0.3mm).