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Cheap pressure gauge!
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Discussions > Espresso > Machines > Cheap pressure...  
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Riprazor
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Joined: 17 Jan 2004
Posts: 138
Location: North Oaks, MN
Expertise: I live coffee

Espresso: Isomac Tea, LaSpaziale S1,...
Grinder: Mazzer Mini x 2
Drip: only when wet
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Posted Thu Dec 16, 2004, 6:58am
Subject: Re: Cheap pressure gauge!
 

Srock Said:

Very cool - doe you think a tire pressure guage is precise enough at low pressures to give an accurate result? My guess they are calibrated to be their best at 20-30lbs pressure.  I may look around to see if there are cheap low pressure guages avail. Your idea is teriffic !

Steve

Posted December 16, 2004 link

1'st compliments on a great idea.  To your point, another source of pressure guages is your local pool/spa supply store.  For $6 I picked up a guage that goes from 0 - 60 PSI which I use to regulate the water pressure going to my La Spaziale.  No need to convert from BAR to PSI and more precise at lower pressures.

Regards,
Barry
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brianbonedoc
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Joined: 5 Jan 2004
Posts: 17
Location: Los Angeles
Expertise: I love coffee

Posted Thu Dec 23, 2004, 12:19pm
Subject: Re: Cheap pressure gauge!
 

Great idea Murray!

Here is my rendition

Bottom of cycle = just when light goes ON!

The gauge reads 12psi = 0.83 Bar

brianbonedoc: bottom of cycle (Small).jpg
(Click for larger image)
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brianbonedoc
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Joined: 5 Jan 2004
Posts: 17
Location: Los Angeles
Expertise: I love coffee

Posted Thu Dec 23, 2004, 12:22pm
Subject: Re: Cheap pressure gauge!
 

And here is the Top of the cycle.

Gauge reads - 15.5 psi = 1.06 Bar

My deadband is then 15.5-12 = 3.5 psi = 0.24 Bar

This is after adjusting my pstat.

When I first started the Top of the cycle was at 19-20 psi (1.34 bar) = which is probably a little high (hot)

So i turned my PSTAT  CLOCKWISE to decrease the pressure.

Thanks for all the great posts.

Now off to try out my new settings!

brianbonedoc: top of cycle (Small).jpg
(Click for larger image)
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gourmetguy
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gourmetguy
Joined: 10 Dec 2002
Posts: 111
Location: Atlanta
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Espresso: All kinds of stuff
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Posted Thu Dec 23, 2004, 9:34pm
Subject: Re: Cheap pressure gauge!
 

gajetjunkie Said:

round tire pressure gauge

Posted August 11, 2004 link

Best idea I've seen here in a while.  Here's my question... tire guages, don't they require a needle to depress their valve to allow a reading, i.e., like what's found on a tire valve?  Or does the steam pressure depress their valve by virtue of force?  I have a Marcuzzi en route and am most intrigued!
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KittJ
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Joined: 19 Jul 2004
Posts: 324
Location: Chappaquiddick Island

Espresso: PID Expobar Brewtus IIIR;
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Drip: Why??
Posted Fri Dec 24, 2004, 5:06am
Subject: Re: Cheap pressure gauge!
 

Hey Steve .... Please post back here with your findings.  Kitt
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mbonus
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Joined: 4 Nov 2004
Posts: 56
Location: Florida
Expertise: I like coffee

Espresso: Expobar Pulsar
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Posted Fri Dec 24, 2004, 8:11am
Subject: Re: Cheap pressure gauge!
 

gourmetguy Said:

Best idea I've seen here in a while.  Here's my question... tire guages, don't they require a needle to depress their valve to allow a reading, i.e., like what's found on a tire valve?  Or does the steam pressure depress their valve by virtue of force?  I have a Marcuzzi en route and am most intrigued!

Posted December 23, 2004 link

While I have not yet built a "cheap pressure gauge", but I thought the same thing.  I happen to have a round tire gauge and checked it out.  The piller in the center is actually fixed and depresses the needle-spring in the tire valve.
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brianbonedoc
Senior Member


Joined: 5 Jan 2004
Posts: 17
Location: Los Angeles
Expertise: I love coffee

Posted Fri Dec 24, 2004, 12:00pm
Subject: Re: Cheap pressure gauge!
 

The tire gauge I used was $6.99 at Kragen.  It is pretty nice/metal case felt sturdy.  

I was able to unscrew (by hand) part of the stem that attaches to the needle valve on the tire so there is a clear
unobstructed path from the outside world to the gauge.  I assume most decent gauges allow you to do this.

-B
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Mickael_esp
Senior Member
Mickael_esp
Joined: 20 Nov 2004
Posts: 30
Location: Portland OR
Expertise: Professional

Espresso: LaMarzocco FB70 2grp
Grinder: Mazzer Super Jolly Timer
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Roaster: So many good ones! Cafe'...
Posted Sat Dec 25, 2004, 8:12am
Subject: Re: Cheap pressure gauge!
 

Very nice. I spent thousands to get portafilter-gauges for all the machines I work on! Machine guages go bad quite often. Its good to check them.

 
Mikey
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Srock
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Joined: 15 Nov 2004
Posts: 87
Location: Boston
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Posted Sat Dec 25, 2004, 11:38am
Subject: Re: Cheap pressure gauge!
 

To those who might be interested - I'm going to give this a try

Click Here (cgi.ebay.com)

Steve
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mike01
Senior Member


Joined: 21 Jan 2004
Posts: 372
Location: SE Michigan
Expertise: I love coffee

Espresso: Izzo Alex
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Posted Sat Dec 25, 2004, 7:35pm
Subject: Re: Cheap pressure gauge!
 

Walmart sells a round brass tire pressure gauge that works quite well.  If I remember right, I paid about 6 or 7 dollars for it.
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