Second crack

[Sam]

Hi All,

Can anyone hear second crack above the fan noise? I can't, am I missing something?

In the absence of an audible second crack, what are people doing to "log" second crack? What should I be looking or listening for?

Thanks,

Sam

[kaffelogic]

In my experience different beans vary in their noisiness. Some of them I can't even hear first crack; some both first and second crack are clearly audible. Unfortunately I believe that if you can't hear it, you can't log it and have to go off time and temperature alone.

[Damian]

post your ROR curve, I'll show you FC and SC

[Sam]

Hi Damian,

Here is my log file from a my roast of 100 gm Brazil Santos.

I don't know why the RoR curve did not track the profile. It was roast no.8 in back to back roasts.

Thanks,

Sam

[Sam]

Hi Damian,

Here is another log file. The first roast of the day.

Sam

[Damian]

I think you logged it correctly in the second log, I'm not sure I see SC

I'd call FC in your 0072 log at about 5:10 to 5:20 depending how you call FC, but with a really fast roast like that it is harder to pick, and often more spread out

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[Sam]

Hi Damian,

I can usually hear FC its usually between 7:00 and 7:30 minutes for most of my roasts.

It's second crack that I can't hear.

I'll have to analysis my log files more closely.

Thanks,

Sam

[kaffelogic]

Hi Damian,

Here is my log file from a my roast of 100 gm Brazil Santos.

I don't know why the RoR curve did not track the profile. It was roast no.8 in back to back roasts.

Thanks,

Sam

Hi Sam
The explanation is the 90-min bug. Whenever the roaster has been on continuously for over 90 minutes it starts to loose its ability to calculate ROR correctly. This meant it could not stay on the profile in your log. The explanation is a bit obscure (catastrophic cancellation of floating point numbers), but there is now a fix available. The fix has been applied to the official release, and also to the two different beta releases currently available. If you update your firmware to the appropriate version the problem will go away in future roasts. See https://kaffelogic.com/community/viewto ... t=144#p902
Cheers
Chris

[Sam]

Hi Chris,

I was wondering why the RoR was all over the place.

Will update the firmware.

Thanks,

Sam