[Homeroast] Puzzled by Quest

Robert Bedwell rlb at triad.rr.com
Sun Mar 13 16:23:38 CDT 2011


10.4 amps,  1160 watts


On Mar 13, 2011, at 4:32 PM, Edward Bourgeois wrote:

> 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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> 
> 
> 
> -- 
> Ed Bourgeois aka farmroast
> Amherst MA.
> http://coffee-roasting.blogspot.com/
> 
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