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Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
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jdrock
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Joined: 24 Jan 2011
Posts: 22
Location: HK
Expertise: I live coffee

Posted Sun Apr 7, 2013, 4:57am
Subject: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

I just got myself a Eric Thermometer and installed on my DD.
I tried to read the brewhead temperature from the Eric Thermometer and it gave me a total different result when flushing and brewing.
Here's my setting, 1 hour warm up, PID=92C, Offset=10C, brewhead temperature=86C.

a) Without portafilter and flushing, temperature went up to 96C and drop to stable 92C.
b) When actual brewing 30 second 19g coffee, temperature went up to 96C and drop to stable 85C.

In order to obtain the brewhead temperature at 92C, I need to increase the PID to 98C and during the brewing cycle, the max temperature at the brewhead reached 100C and quickly drop to 92C throughout the whole 30 seconds brewing cycle.

I know the theory that due to the restriction of the coffee puck and brewhead temperature drop.
So the question is should I maintain the PID according to the flushing or brewing?
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emradguy
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emradguy
Joined: 31 Mar 2011
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Espresso: Duetto II; Twist v2
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Posted Sun Apr 7, 2013, 5:14am
Subject: Re: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

I'm curious if your pf was preheated for that part of the test? It's got a decent amount of metal and can act as a heat sink while the shots being pulled.

 
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Always remember the most important thing is what ends up in your cup!
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jdrock
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Joined: 24 Jan 2011
Posts: 22
Location: HK
Expertise: I live coffee

Posted Sun Apr 7, 2013, 5:32am
Subject: Re: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

Yes, preheated during the 1 hour warm up time.
Tested both methods. Grind, tamp, flush, brew and flush, grind, tamp and brew.
Both were showing the brewhead temperature drop while brewing.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,950
Location: Riverside, Ca, U.S.A.
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Espresso: ECM Vene. A1, La Cimbali M32
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Posted Sun Apr 7, 2013, 12:41pm
Subject: Re: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

To answer your last question, with a question, do you drink your espresso from the flush or the brew?
If a pid would make a difference on my machine and if I had one, that is where I would take the readings from.:-)

 
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frcn
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frcn
Joined: 23 Dec 2001
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Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
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Posted Tue Apr 16, 2013, 12:09pm
Subject: Re: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

I flush until the temp reaches an indicated peak temperature then stop the flush. How do I know what that is? A bit of practice taught me. After that, I don't look at the thermometer. I don't care what it shows during the brew. I only care about the taste of the espresso. I have the offset adjusted so that the display shows the temperature of the flush temperature's peak previously mentioned. That also is about the same peak temperature that is indicated during the flush. If you are concerned about the brew temperature at the coffee you will need to invest in a Scace device or similar tool. Other than that, ignore the temperature change during the brew cycle and use taste as the only indicator as to what adjustments need to be made. One man's opinion.

 
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danutco
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danutco
Joined: 15 Dec 2012
Posts: 7
Location: Brasov, Romania

Posted Sat Apr 27, 2013, 2:57am
Subject: Re: Vibiemme Domobar Double Boiler PID (DD) and Eric Thermometer
 

discussing about temperature measurements in the brewhead (E61 in my Bezzera Magica), is it true that the displayed temperature does have significance only during the time the brewing valve is open, that is the water is flowing over the sensor?
do you use the values indicated on the brewhead thermometer while the machine is idling? is there some consistency from machine to machine, as the sensor is only in hot air?
thank you...
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