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Topic: Puzzled by Quest (13 msgs / 317 lines)
1) From: Robert Bedwell
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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2) From: Hank Perkins
Are both elements operational?
Is anything impeding the airflow like beans in the top pipe?
Is The fan blowing?
Thanks,
Hank 
Sent from my iPhone
On Mar 13, 2011, at 1:54 PM, Robert Bedwell  wrote:
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3) From: Josh Schwartz
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  wrote:
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4) From: Hank Perkins
unplug and replug the probes into the meter.
On Sun, Mar 13, 2011 at 2:16 PM, Josh Schwartz  wrote:
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5) From: Robert Bedwell
Hank,
I just checked the tube and there were around 6 beans in there.  I normally clean it after each session.
I will check to see if both elements are functioning.  I assume you are referring to the heat elements on each of the insides of the drum.  The fan functions normal.
Thanks for the reply....if you have any more ideal I would appreciate it. 
I am going to check to see how the BT probe responds to a boiling temperature.
Bob
On Mar 13, 2011, at 3:12 PM, Hank Perkins wrote:
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6) From: ricky carter
pop the original dial gauge back in and see if it confirms temps.
On Sun, Mar 13, 2011 at 3:16 PM, Josh Schwartz  wrote:
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7) From: Robert Bedwell
Thanks Ricky.....I just ran a boiling water test and confirmed that the BT probe records 180F at boiling and the ET probe 212.  32 degrees diff is pretty significant.  I double checked using my FLuke and the temperatures came out the same as the Omega.   If the temperature increases linearly adding 32 degrees to the roast it still will not be a normal 1C range.  Per Hanks suggestion I am going to make sure the heat elements are functioning.
If you think of anything else please post.
Thanks,
Bob
On Mar 13, 2011, at 4:05 PM, ricky carter wrote:
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8) From: Edward Bourgeois
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  wrote:
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-- =
Ed Bourgeois aka farmroast
Amherst MA.http://coffee-roasting.blogspot.com/Homeroast mailing list
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9) From: miKe mcKoffee
Josh was spot on. If you're BT is reading ~300f start of 1st you've got a
temp measurement equipment problem no if ands or buts. The Quest isn't the
issue.
Slave to the Bean  miKe mcKoffee
www.CompassCoffeeRoasting.com
URL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
Sweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/=
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10) From: Robert Bedwell
10.4 amps,  1160 watts
On Mar 13, 2011, at 4:32 PM, Edward Bourgeois wrote:
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11) From: Robert Bedwell
Thanks Mike....It definitely isn't the Quest.  I can get full amps out of it.  
It is  the BT probe.   It's registers 180 immersed in boiling water while the ET probe is at 212. 
I just inserted a probe where the BT probe was inserted and it took a bit less than 15 minutes to reach 400F bean load temp.  I haven't seen this in the last half dozen roasts.
I have ordered a replacement from Eric.  
Thanks for the note.
On Mar 13, 2011, at 5:14 PM, miKe mcKoffee wrote:
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12) From: Hank Perkins
Mike is right.  That looks like both elements are hot.  plug and
unplug the thermocouples.  You could have an oxidization issue or they
may be failing.
Dip one in boiling water, does it read 212?
On Sun, Mar 13, 2011 at 4:23 PM, Robert Bedwell  wrote:
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13) From: g paris p
just read thi post and all I could think of was flicking the gauge...
having an old jeep around or any other car with a temp/oil gauge
they need a flick of the fingers.
bet the gauge is gone by the wayside.
let us know,
ginny
On Sun, Mar 13, 2011 at 2:23 PM, Robert Bedwell  wrote:
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