Re: Questions on Carezza

In article <42ea0c0e.262239230@localhost>, ross@xxxxxxxxxxxxxxxxxxxxxx
says...
> | 1. Blank Shot Temps run @ 160F - I thought I read somewhere that a
> | boiler will get the water to ~205F and it will drop to 190F by the time
> | it hits the cup. By placing a thermometer in the cup after I pull a
> | shot I see no more than 160F immedately.

Get the a thermometer with the fastest response time you can find. Chop
a styrofoam cup down and stick the probe through the bottom. Jam it up
to the group head and run the pump. You should get a reasonable idea of
temp that way. To test it any better, you'll need a thermocouple.


> | 2. Water Tank - OK.. this might be hard to explain. I've noticed lately
> | some "bubbles' coming from one of the tubes in the water tank. Also
> | more "boiling" noise than I originally remember.

It's fairly normal for the Carezza. It's excess pressure bleeding off
through the OPV. It should be most obvious during the transition from
brew to steam modes. My old machine would ocassionally burble a bit
after sitting idle as well.

> | But my real point of
> | concern is that the water in the tank gets warm over time... I haven't
> | put a thermo in it yet, but it is pretty warm.

One of the effects of the bubbles you are hearing. Another reason is
below.

> I don't know on this particular machine, but certainly the reservoir can
> become heated from the boiler's proximity.
>
> | seem right to me... Am I losing water from my boiler back into the
> | water tank?
>
> Absolutely not.

Hmm...depends He very well could be draining water back into the
reservior from the OPV when pulling a shot. Not uncommon on either of
my Gaggias.

Mike
.

Relevant Pages

  • Homebrew Digest #4980 (March 23, 2006)
    ... Subject: Oxygen scavenging caps ... crowns is coated with a special oxygen-scavenging agent. ... water to additive because water contains a high amount of oxygen and can be ... The solution is to calibrate the thermometer using known temperatures. ...
    (rec.crafts.brewing)
  • Re: Calibrated Thermometers
    ... temperature of ice water with my question. ... operating range of the thermometer to calibrate it, ...
    (rec.photo.darkroom)
  • Re: Calibrated Thermometers
    ... I got out some distilled water ice cubes (used to mix working developer on ... After stirring for a few minutes, the thermometer ... use it to calibrate my dial darkroom thermometers and my water temp control ...
    (rec.photo.darkroom)
  • Re: Calibrated Thermometers
    ... "calibration" purposes. ... If I put the thermometer in a glass of ... The idea is to *isolate* the water from heat loss or gain to the ... and hence the temperature will be constant at the melting point ...
    (rec.photo.darkroom)
  • Re: Calibrated Thermometers
    ... temperature of ice water with my question. ... course that begs the question - how do I know the digital thermometer is ...
    (rec.photo.darkroom)