Re: Rope Heater thermal putty

On 1 Jul 2006 11:43:47 -0700, "cpl593h" <CPL593H@xxxxxxxxx> wrote:

Thanks for the input, Andy. It's encouraging to me that you have
experimented with the Zaffiro and found its thermal stability abysmal.
The E61 definitely isn't a flawed design, but they were designed to be
attached to a heat exchanger and fed with water significantly hotter
than the brew temperature in a single boiler machine.

The desire to test variables other than boiler temperature began with
taste. After I PIDed the machine I noticed that the repeatability just
wasn't there and I had to turn the setpoint lower and lower during a
steady session because the shots kept tasting hotter and hotter. Then
when I'd return the setpoint to the desired value so the machine could
idle, the shots tasted cool even after a significant flush.

I had enough thermal instability headaches with the lever machines that
I ditched in favor of the Zaffiro - I'd just like it to be over and
done with.

"Abysmal" is a pretty strong word.The machine was designed for home
use, not "steady sessions." Obviously, the more successive shots you
pour, the closer the brewhead and brew water will come to boiler
temperature.

In normal use I've found 101C, measured by the PID probe in the
boiler, after a 2-second flush, consistently yields 89-90C in the
portafilter (measured by a K thermocouple repeatedly placed on top of
an actual coffee puck and a cheapie multimeter). It ain't a Scace 'n'
Fluke, but I find the consistency encouraging. In any event, at four
shots a day, I have found it very consistent in the cup, as have
others.

That's not to say the Zaffiro is the Holy Grail. I pretty regularly
get better shots from my local roaster's Swift and Linea on the same
coffees. But, we're talking about consistency here.

Marshall
.

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