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DIY PortaFilter - ThermoFilter; Inexpensive Basket Thermofilter; Styrofoam Cup
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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 302
Location: Americas
Expertise: I love coffee
Posted Wed Sep 18, 2013, 4:30pm
Subject: Re: Easy DIY Thermofilter DIY Scace
 

It would be interesting to compare results from using a coffee simulator to results from a lightweight sensor (say an epoxy coated RTD or bare thermocouple wires) in the coffee on actual shots.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,026
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Sep 19, 2013, 7:09pm
Subject: Re: Easy DIY Thermofilter DIY Scace
 

Jonr, I know that some use a thermocouple over the lip/edge of the PF and do what you suggest.  AndyPanda mentioned that on page 2 of the PID thread, before his thermofilter.  Some of the DIY thermofilters, like mine, suffer from initial damping and lose the upward bump that you have seen.  Not too worrisome for me as I was trying to get the approximate temperature and show that enough heat could be added in the brew to stabilize the intrashot.  A little less heat will allow for a small drop or no heat back to more standard drop.  The datalogged plots are great especially with rapidly responding sensors.  I am happy knowing that you have done that work and show what added heat can do, including the preheating.  My damped sensor may not respond as well, but that is likely a tech and display/data problem, not temperature.  Fortunately I can get in the range and then use taste.

Taste in the cup trumps the plot, but I appreciate your work :)

 
D4F also at
http://www.gaggiausersgroup.com/
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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 302
Location: Americas
Expertise: I love coffee
Posted Mon Sep 30, 2013, 11:46am
Subject: Re: Easy DIY Thermofilter DIY Scace
 

I ordered one of these and it seems to work well for 1 second logging of temperature.

http://dx.com/p/usb-thermocouple-measurement-device-66778
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,026
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri Nov 29, 2013, 8:25pm
Subject: Re: Easy DIY Thermofilter DIY Scace
 

Finally made another thermobasket with 2 holes, a 0.009 and a 0.011".  I can plug either with duct tape.  The 0.009 gives about 25 - 30 gm or ml in 25 seconds and the 0.011 about 55 gm or ml.  If you try one of these, it is very important to wet the wire with liquid silicone lube and let it dry.  The 0.009 may break instead of pull if you are not careful.  The 0.011 is fairly easy to work with.

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


Joined: 15 Mar 2012
Posts: 2,026
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Mon Dec 9, 2013, 9:58pm
Subject: Re: Easy DIY Thermofilter DIY Scace
 

Tried another approach which to a thermofilter which can be done with a drill and JB Weld.   A build thread here

http://www.gaggiausersgroup.com/index.php/topic,187.0.html

A photo included

D4F: Thermofilter for Gaggia crop.jpg
(Click for larger image)

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