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JY
Senior Member
JY
Joined: 2 Jun 2011
Posts: 27
Location: Washington DC
Expertise: I live coffee

Espresso: Grimac Mini, Pavoni P/Tre,
Grinder: Preciso, Cunill Brasil,...
Vac Pot: Yama, Cory, Rasotherm
Drip: V-60, Clever, Brazen
Roaster: Behmor
Posted Sun Feb 10, 2013, 7:26am
Subject: Temp/pressure gauge
 

Just put this franken-gauge together, and was wondering how far off will the actual brew temp readings register.

(The T type probe sits about 1/2" into the bottom of the portafilter.)

Any thoughts?


Thanks-

JY: IMAG0205.jpg
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,022
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Feb 10, 2013, 1:32pm
Subject: Re: Temp/pressure gauge
 

I understand the gauge, fairly standard set up.  Static only, or does it have an adjustment for shot simulation?  

I played a bit with thermofilters, below, and pose a few of the potential problems.  It can work, and you may have already used it, though you have not said.

http://coffeegeek.com/forums/espresso/machinemods/588424

Again, static or flow simulation.  If I understand the concept, you will fit the device on the bottom of a PF and then not be able to use a basket as there is no seal from the basket to the thermofilter.  What will fill the basket deadspace?  If water, then you are using a fair amount of water, not actually like a puck.  Again, flow is important.

How will you avoid water penetrating along the thermocouple insulation, is it so sealed that water cannot get between the wire and insulation?

I will look forward to your comments and results.

 
D4F also at
http://www.gaggiausersgroup.com/
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JY
Senior Member
JY
Joined: 2 Jun 2011
Posts: 27
Location: Washington DC
Expertise: I live coffee

Espresso: Grimac Mini, Pavoni P/Tre,
Grinder: Preciso, Cunill Brasil,...
Vac Pot: Yama, Cory, Rasotherm
Drip: V-60, Clever, Brazen
Roaster: Behmor
Posted Sun Feb 10, 2013, 3:26pm
Subject: Re: Temp/pressure gauge
 

D4F Said:

I understand the gauge, fairly standard set up.  Static only, or does it have an adjustment for shot simulation?  

I played a bit with thermofilters, below, and pose a few of the potential problems.  It can work, and you may have already used it, though you have not said.

http://coffeegeek.com/forums/espresso/machinemods/588424

Again, static or flow simulation.  If I understand the concept, you will fit the device on the bottom of a PF and then not be able to use a basket as there is no seal from the basket to the thermofilter.  What will fill the basket deadspace?  If water, then you are using a fair amount of water, not actually like a puck.  Again, flow is important.

How will you avoid water penetrating along the thermocouple insulation, is it so sealed that water cannot get between the wire and insulation?

I will look forward to your comments and results.

Posted February 10, 2013 link



Yes, the thermocouple is sealed, but no filler for the dead space as of yet, and no valve either.

The gauge works as it should giving a static reading (I've got my Grimac Mini set to 9.5 bar static, so around 8.5 bar with the flow).

Temperature is another story as you indicated without a simulated puck taking up the void, I'm getting readings of a full portafilter, which I suspect are going to be much lower than the water that's hitting the top of a puck.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,022
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sun Feb 10, 2013, 3:46pm
Subject: Re: Temp/pressure gauge
 

Yep, the gauge is the easy part.  You can add in a needle valve for flow regulation.  Some flow will be needed for an accurate temperature reading.  Epoxy and talc, microballoons, or other filler in the epoxy can be used, and I used a circle of HDPE plastic as described in the above thread.

And this
http://coffeegeek.com/forums/members/buysell/591645

 
D4F also at
http://www.gaggiausersgroup.com/
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