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Date: 07 Dec 2006 13:33:22
From: Ton
Subject: Is my i-Roast faulty ?
A week ago I took the plunge and bought an i-Roast 2 to start home
roasting. The results are already very decent and I don't regret my
purchase. It is nice to have beans that fresh.
But there is one thing that worries me a bit. The first days I heard the
fan speed varying in a very noticable way,ramping up and down, but I
knew already that this is normal. However during the last few days the
fan speed is constant during the complete roast, except for when the
cooling stage starts. There is no audible variation.
I also tried to monitor the temperature with a digital thermometer and a
thermocouple in the beans. It stroke me that the indicated temperature
(on the digital thermometer) climbed VERY slowly to around 170-180* C
and stayed there, except for the very last seconds, when it increased
very fast to around 270*C. I was using Preset 2 then.
Does this mean that my i-Roast 2 is not working the way it should ?




 
Date: 08 Dec 2006 10:04:09
From: JulesG
Subject: Re: Is my i-Roast faulty ?
I really don't know - I have never used a profile with declining
temperatures. It seems to be counterproductive. Anyway, the proof is
in the puding... so taste will tell.

I suggest you graph the temp curves, if I'm right, they should always
go up or you stand a chance to bake the beans.

At least, the fan fluctuates and you found a way to hold the TC.

Good luck



 
Date: 08 Dec 2006 16:59:20
From: Ton
Subject: Re: Is my i-Roast faulty ?
Meanwhile I tried it again, keeping the probe in place with a paperclip
and that worked.
I thought it would be a good idea to use Preset 2 (prolonged in 3rd
stage) at first, because that rises the temperature at first to 455*F
and then lowers it in 2nd stage to 400*F. In stage 3 it should go to 435*F.
In Stage 1 the TC readings climbed from 253 to 430*F and the IR2 from
307 to 422*F
In Stage 2 the TC readings climbed from 435 to 460*F and the IR2 went
from 426*F in the first seconds to 420*F and stayed there until the end,
when I started cooling, because the beans became shiny.
To my surprise the fan speed was alternating in Stage 2 now, going up
and down. So everything seems to be o.k. Do you agree ?
Ton


 
Date: 07 Dec 2006 14:10:12
From: JulesG
Subject: Re: Is my i-Roast faulty ?
I am not familiar with 220 volts since I am in Canada but a 1%
difference is really not much - about what I get here, so that should
be ok.

395 F is the reading I get from the iR2 when Monkey is at Vienna level,
so you should be ok there also.

I am really surprised about the fan. On my iR2, it switches to low
when the programmed temp is >= 400 F.

Be patient now and wait 3 days. Then report on the results.



 
Date: 07 Dec 2006 06:37:18
From: JulesG
Subject: Re: Is my i-Roast faulty ?

Ton wrote:
> JulesG wrote:
> > Ton,
> >
> > If you like the results, your iR2 must be working OK. Where is the TC
> > probe located ? What are the temp. readings of the iR2 ?
> >
> > I suggest you program this profile, do a roast and note the temps of
> > both the TC and the iR2 every 30 sec. and post the results here. If
> > you have a voltmeter, measure the AC voltage.
> > 1- 3 min. 320 F.
> > 2- 2 min. 355 F.
> > 3- 2 min. 385 F.
> > 4- 1.5 min. 410 F.
> > 5- 6.5 min. 435 F.
> >
> > You will have to stop the roast manually according to colour somewhere
> > between 04:00 and 02:30 (time display). If you are not sure, stop at
> > 03:30 - the beans will be around FC+ to Vienna. The fan should be at
> > high speed until you reach stage 4, the time will show 06:30 - it will
> > switch to low and stay at low speed until cooling. Make sure the TC is
> > in the beans, but not touching the steel bottom, not too close from the
> > glass side.
> >
> > Have fun !
>
>
> Thanks JulesG for your quick reply.
> As far as I could see , I think the probe was a few milimeters in the
> bean mass.
> I will try your profile, but before doing so and to know if I am doing
> it right, I have another another question. How do you put the
> thermocouple in and make sure that it stays in place ? I have a K-type,
> consisting of a thin, rather stiff, flexible thread with a small, bare,
> arrow-like end. I threaded it through one of the holes in the lid and
> then around and under the chaff collector (the big metal basket), but
> found it difficult then to get it in the right place.

I had to enlarge a hole in the lid slightly, it barely shows. I also
had to enlarge a hole in the chaff collector - this one shows. Bend
the TC wire according to need and assemble the top part with the wire.
Once you are happy with the results, k the wire for length just
outside of the lid.



 
Date: 07 Dec 2006 05:22:22
From: JulesG
Subject: Re: Is my i-Roast faulty ?
Ton,

If you like the results, your iR2 must be working OK. Where is the TC
probe located ? What are the temp. readings of the iR2 ?

I suggest you program this profile, do a roast and note the temps of
both the TC and the iR2 every 30 sec. and post the results here. If
you have a voltmeter, measure the AC voltage.
1- 3 min. 320 F.
2- 2 min. 355 F.
3- 2 min. 385 F.
4- 1.5 min. 410 F.
5- 6.5 min. 435 F.

You will have to stop the roast manually according to colour somewhere
between 04:00 and 02:30 (time display). If you are not sure, stop at
03:30 - the beans will be around FC+ to Vienna. The fan should be at
high speed until you reach stage 4, the time will show 06:30 - it will
switch to low and stay at low speed until cooling. Make sure the TC is
in the beans, but not touching the steel bottom, not too close from the
glass side.

Have fun !



  
Date: 07 Dec 2006 19:26:07
From: Ton
Subject: Re: Is my i-Roast faulty ?
JulesG wrote:
> Ton,
>
> If you like the results, your iR2 must be working OK. Where is the TC
> probe located ? What are the temp. readings of the iR2 ?
>
> I suggest you program this profile, do a roast and note the temps of
> both the TC and the iR2 every 30 sec. and post the results here. If
> you have a voltmeter, measure the AC voltage.
> 1- 3 min. 320 F.
> 2- 2 min. 355 F.
> 3- 2 min. 385 F.
> 4- 1.5 min. 410 F.
> 5- 6.5 min. 435 F.
>
> You will have to stop the roast manually according to colour somewhere
> between 04:00 and 02:30 (time display). If you are not sure, stop at
> 03:30 - the beans will be around FC+ to Vienna. The fan should be at
> high speed until you reach stage 4, the time will show 06:30 - it will
> switch to low and stay at low speed until cooling. Make sure the TC is
> in the beans, but not touching the steel bottom, not too close from the
> glass side.
>
> Have fun !


Jules, I ran your profile. Unfortunately the measuring with the TC
didn't go well. Although I had the probe in the right place it was
pushed away and against the glass after a few minutes. Maybe I will try
it again tomorrow and fix the thread to the funnel with a paperclip or
something like that.
The audible speed didn't change during the whole roast and stayed
constant, as far as I could hear it.
The IR2 readings were:
Stage 1:302-340-352-360-365*F;
Stage 2:370-374-376-380*F;
Stage 3:384*F;
Stage 4:384-388-392*F;
Stage 5 395-397-395-395-397*(until cooling).
Btw, I measured the voltage, which should be 220V and it was 222-223V. >


   
Date: 07 Dec 2006 19:33:11
From: Ton
Subject: Re: Is my i-Roast faulty ?
Oh, I forgot to say that I ended the roast after 12.30m, when tiny
oildrops on some beans


  
Date: 07 Dec 2006 14:55:40
From: Ton
Subject: Re: Is my i-Roast faulty ?
JulesG wrote:
> Ton,
>
> If you like the results, your iR2 must be working OK. Where is the TC
> probe located ? What are the temp. readings of the iR2 ?
>
> I suggest you program this profile, do a roast and note the temps of
> both the TC and the iR2 every 30 sec. and post the results here. If
> you have a voltmeter, measure the AC voltage.
> 1- 3 min. 320 F.
> 2- 2 min. 355 F.
> 3- 2 min. 385 F.
> 4- 1.5 min. 410 F.
> 5- 6.5 min. 435 F.
>
> You will have to stop the roast manually according to colour somewhere
> between 04:00 and 02:30 (time display). If you are not sure, stop at
> 03:30 - the beans will be around FC+ to Vienna. The fan should be at
> high speed until you reach stage 4, the time will show 06:30 - it will
> switch to low and stay at low speed until cooling. Make sure the TC is
> in the beans, but not touching the steel bottom, not too close from the
> glass side.
>
> Have fun !


Thanks JulesG for your quick reply.
As far as I could see , I think the probe was a few milimeters in the
bean mass.
I will try your profile, but before doing so and to know if I am doing
it right, I have another another question. How do you put the
thermocouple in and make sure that it stays in place ? I have a K-type,
consisting of a thin, rather stiff, flexible thread with a small, bare,
arrow-like end. I threaded it through one of the holes in the lid and
then around and under the chaff collector (the big metal basket), but
found it difficult then to get it in the right place.