Zero cost adapter for portafilter pressure gauge - Page 2

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Peppersass
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Real Name: Dick Green
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Postby Peppersass » Wed Sep 12, 2012 11:35 pm

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

tonto
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Postby tonto » Mon Jan 21, 2013 10:22 pm


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erics
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Real Name: Eric Svendson
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Interests: Temperature, Pressure, and Pianos

Postby erics » Mon Jan 21, 2013 11:14 pm

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
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Postby Beenbag » Tue Jan 22, 2013 3:48 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
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Postby GlennV » Tue Jan 22, 2013 7:55 am

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