[Homeroast] Puzzled by Quest

Edward Bourgeois edbourgeois at gmail.com
Sun Mar 13 15:32:24 CDT 2011


If you have  a Kill-A-Watt meter you can set it on watts and see
what's being drawn

On Sun, Mar 13, 2011 at 4:05 PM, ricky carter <rickylc99 at gmail.com> wrote:
> 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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-- 
Ed Bourgeois aka farmroast
Amherst MA.
http://coffee-roasting.blogspot.com/



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