[Homeroast] Puzzled by Quest

ricky carter rickylc99 at gmail.com
Sun Mar 13 15:05:42 CDT 2011


pop the original dial gauge back in and see if it confirms temps.



On Sun, Mar 13, 2011 at 3:16 PM, Josh Schwartz <veganjosh at gmail.com> wrote:

> I think it must be that your temperature measurement is off somehow --- as
> far as I understand, it's physically impossible that your coffee is
> cracking
> at anything near 290.
>
> On Sun, Mar 13, 2011 at 2:54 PM, Robert Bedwell <rlb at triad.rr.com> wrote:
>
> > I have had my Quest for about three months and have done about 30 roasts
> on
> > it.  It has worked like a charm until the last three sessions and I have
> no
> > clue what is going on.
> >
> > I have Eric's thermocouple installed in two places and attached to an
> Omega
> > 806.  Plans are to connect it to my Mac for data logging after I become
> > consistent with using it.
> >
> > The first indication of a problem was when it took so long to preheat
> with
> > the amps set at 10 and the fan at 4.5.  The ambient temperature was
> around
> > 55F in the garage so I assumed
> > it was due the cooler temp.  Incidentally my Quest has an insulation
> > blanket installed over the drum.   The last three sessions have required
> > around 45 minutes to reach 400F which is the temp
> > that I use to load the beans.  Prior to these roasts it has taken no more
> > than 15-20 minutes.
> >
> > Today I roasted Quatemala Zumay Santa Elena del Jumay......thinking it
> was
> > the Ethiopian Sidama Bonka that was the source of the problem in the
> > previous 5 roasts.   However the Quatemala mirrored
> > the Bonko roasts.....only faster.
> >
> >
> > After loading the beans at 400F the temperature drops to around 210 and a
> > minute later is back up to 220 with a environmental (ET) temp of around
> 580.
> >   With the AMP set at 8.5 and the Fan at 4.5 it is taking 9.5 minutes to
> > reach 300F.  Unfortunately, and this is where I am stumped, the first
> sign
> > of first crack is at around 290 (not 390) and first crack is over by 11.5
> > minutes at 320F.  The low point of ET is 534 and the high is 583.
> >
> > The above has occurred for the last five batches I have roasted.   I have
> > checked the temperature recordings of the Omega to my Fluke using the
> > thermocouples use on the Quest and compared them to temp readings
> > I am getting on the Fluke.  They all read within a degree of each other.
> >  Both the Fluke and the Omega are set for K type thermocouples and there
> is
> > not an offset on either one.  Both are set for fahrenheit recording.
> >
> > So, to say that I am puzzled is an understatement.
> >
> > I removed the drum about 15-20 roasts ago and cleaned it but it there was
> > hardly anything that came off.  I have cleaned the thermocouples to make
> > sure they weren't affecting the temps.
> >
> > To sum up;
> >
> > Last five roasts have required at least 45 minutes to heat up to the 400F
> > bean load temperature with amps set at 10 and fan at 4.5
> > Taking 9-1/2  minutes to hit 300F and 1C  has already started at around
> > 290F
> > !C is over at around 11-3/4 minutes at 325F
> > Both probes used in the Quest have been checked with the FLuke I have and
> > are very close to the same readings
> > Probes have been cleaned
> >
> > _______________________________________________
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> >
> >
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> >
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