>From time to time, particularly *when trying to dial in some beans that
seems to be happier with higher brew temps*, I seem to run into a problem
whereby *any attempts to increase the brew boiler temps after a certain
point does not give me any perceptible changes in the cup*. This, even
though I am very used to easily tasting cup differences with a 1 degree C
change (the smallest change my Brewtus 1 can do) and always have wished
that I can make 1 degree F changes...
So it occurred to me that if the water were at any point in the brewpath to
lose pressure, then the water would instantly lose its heat and any setting
which relied on getting the brew boiler temps above 100 degrees C may
indeed be wasted. Note that the brew boiler temps should reach a target of
the front panel temp + any programmed offset (C0) in the Brewtus controller.
In brief, I conducted a series of tests at the 5 mm bolt in the brewhead
where from a set front panel temp of 96 degrees and a varying programmed
offset (C0) of -1 to -9 degrees (i.e. target brew boiler temps from 97 to
105 degrees C) that *any offsets from -4 to -9 failed to make any
difference in the measured water temperatures*.
If I could there'd be one thing that I'd change with how I ran the
experiment, and that is with the 5 mm bolt in place and all efforts done to
ensure that it simulates as much as possible a loaded puck in the
portafilter as well, with all temperature measurements taken right at the
puck itself.
This is something that one can easily do with a Scace device, and if I had
one I wouldn't be making this request.
*So if you're at all interested, all I ask is for a series of measurements
as follows:*
- With the front panel temperature fixed at 96 degrees C, measure the
brew water at the portafilter with a Scace device under varying values (-1
to -9) of Brewtus' offset (C0) parameter
- For consistency start each measurement by waiting for the brew power
light to go on then go off
- As soon as the brew light goes off, start the pump and make the
measurement, or at least before an espresso's worth of water has been drawn
Does one also see the brew temps stop to rise after a certain temperature,
and if so, at what temperature? This can have some important consequences
when trying to deal with beans that are happier at the higher brew temps.
BTW here are the results of my original tests:
Expected
Estimated
Boiler Temp at Temp at
Setpoint Offset Temp G/H bolt P/F
96.00 -9.00 105.00 99.00 96.78
96.00 -8.00 104.00 99.00 96.78
96.00 -7.00 103.00 99.00 96.78
96.00 -6.00 102.00 99.00 96.78
96.00 -5.00 101.00 99.00 96.78
96.00 -4.00 100.00 99.00 96.78
96.00 -3.00 99.00 97.39 95.17
96.00 -2.00 98.00 96.78 94.56
96.00 -1.00 97.00 94.17 91.94
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