Roasting with SR540 (or SR800) Extension Tube and Artisan Software
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- Опубликовано: 9 сен 2024
- In this video I show how I modified the SR540 roaster to work with an Extension Tube and the Artisan software and then I demonstrate roasting coffee using this setup. A similar setup should also work with the SR800 roaster.
Jump to a section:
0:30 - Advantages of the Extension Tube
3:50 - Extension Tube Part
4:10 - Chaff Collector Upgrade
6:13 - Longer Bean Thermocouple
09:33 - Artisan Setting Change
10:08 - Roasting Demo
22:24 - Using sound waveform to adjust events timing
23:21 - Artisan Roast Display Summary
Links to previous videos (recommend watching first):
Coffee Roasting with SR540 and Artisan: • Coffee Roasting with S...
SR540 Thermocouple Installation for Artisan Software: • SR540 (or SR800) Coffe...
Coffee Roasting Sound Analysis: • Coffee Roasting Sound ...
Download the Artisan settings file used in this demonstration (after downloading, you can load these settings file into Artisan from Artisan's "Help|Load Settings..." Menu)
drive.google.c...
Other Links:
SR540 Roaster: homeroastingsu...
SR540 Extension Tube: homeroastingsu...
RazzoRoasting Chaff Collector Upgrade Kit:www.etsy.com/l...
Artisan Software: artisan-scope....
Thermocouple Setup Instructions: artisan-scope....
Longer Thermocouple: www.walmart.co...
Phidgets: www.phidgets.com/
Primos Green Beans: www.amazon.com...
Voltage Meter: www.amazon.com...
Microphone (any microphone should work, I used one I already have: the miniDSP UMIK-1): www.amazon.com...
Audacity Software (for recording the sound): www.audacityte...
I never comment on videos, but as a experimentalist in molecular biology I greatly appreciate your level of detail and concise descriptions. I look forward to viewing more of your videos and incorporating these methods into my coffee roasting journey. Cheers!
Thank you very much for your feedback!
In terms of concise information and delivery, honestly some of the best RUclips videos I have ever seen. On this or any other content. Absolutely superb job. I just ordered all of the components and downloaded software so I will be good to go when my SR540 arrives from the Left Coast. Thank you for such awesome videos.
Thank you very much for your feedback, I am glad you found it useful!
Great video! Very well presented!
I've watched your videos each several times to get used to my modded SR540. I hope you come out with more! Thanks so much.
You are welcome! Glad you enjoyed them. For now I am still using the setup in the videos, if I change something in the future I will post a new video. Thanks for your feedback.
Edited like a masters paper. 😅 feels like I’m reading a academic article. Well done
Thank you very much!
What a great video, thanks for doing this. I never would have thought to use Audacity to track first and second crack, brilliant!
Excellent video. I’m glad I did not modify the original tube with the short thermocouple 😅. Now I’m convinced to get the extension tube. Thanks 🙏
Thank you! Once I tried the Extension Tube, I didn't go back to the original tube.
Outstanding. Great clarity.
Thank you!
Thank you for sharing these videos - very professional presentation. I just started roasting at the beginning of the year. I purchased the SR-800 with extension tube. I said to myself I'm going to keep this simple and not get the Artisan setup I saw online while researching roasters. Then I saw your videos and you explained everything so well I made the plunge this week and ordered the hardware. I brew about 1# of beans a week and didn't want to add additional time to my roasting session and your videos make this look simple to hook up and use. Plus, I've been sort of shooting in the dark with my roasting process just trying to hit temps at certain times that I have seen in other videos. I purchased several different beans and was surprised how they roast so differently and you can't just follow one schedule. Seems this software will allow me to better judge my adjustments. Again - keep the videos coming!
Thanks for your feedback Mike, and good luck with the setup. I found I can get repeatable results using the Artisan setup. The outlet voltage in my location varies a lot, so having the bean temperature feedback and the Rate of Change curve helps a lot.
@@coffeeroastingathome8890 Tried out Artisan for the first time. I have the SR800 w/extension. I did three 8oz batches. The delta temp was very hard to manage. Mine reacted much different than yours. I hit 25F delta at about 2.5 Minutes and yours was after 3. I have much bigger delta temp swings when I make a change than you do. I maintained positive delta but it's not a nice slope downward like yours - mine is pretty flat. But it was fun and I actually had something to control to. Thanks for your help!
Amazingly helpful
Thank you!
These videos are fantastic for fully understanding the roasting process. I’ve roasted a few batches in my air fryer without completely understanding what I’m doing, though I eventually achieved fair results (though not highly repeatable). The air fryer I was used has since died. I fear I may have abused it by using it as a coffee roaster ;-). I’m going to upgrade to the SR800 soon.
It seems that the Et data doesn’t add much to the process, and one could probably achieve the same results using only the Bt curve. It also seems like one could use a kitchen timer and a cooking probe to measure Bt (by rigging a holding apparatus, or by using a ported extension such as the Razzo tube) to approximate these results by shooting for specific temperature and time waypoints during the roasting process, with less equipment requirement, since the Bt vs time curve ends up being fairly linear during the roast cycle. Of course, the Artisan software is much more elegant and allows for much greater after-action analysis in order to make iterative improvements. I think my wife would appreciate my not setting up a scientific lab in her kitchen space, though!
Thank you and yes, the setup can be simplified and the Et data is optional.
Why did you stop making videos, this is by far the best channel for this roaster
Thanks for your feedback! I have little time to make new videos, and not much more to offer. Once life get less busy I may put more content :-).
Your videos are very helpful. I don't have the hardware to use Artisan yet, but it should be here next week. I am feeling much better prepared to start using it. I really like the audio angle as I have a hard time hearing the cracks. I am going to simply try audio while I wait for the setup to arrive and see how that goes. Thanks again!!!
Thank you for the feedback, hope the Artisan and sound setup worked well for you.
Coffee engineer!
Thank you for taking the time to put together such a detailed video! Do you think it would be possible to wire something like an arduino to the Fresh Roast to automate the roast once you figure out the timing of fan and heat changes? I just thought that would be neat to automate and have saved roast profiles that you could use.
this video is awesome, thank you!
You are welcome! Thank you for the feedback.
Hello and thank you very much for this video - it was very helpful. I've been using the FR with extender and thermocouples for peaberry roasting because the beans are often too small for my Hottop roaster. I'm sure this information will help me to roast these tricky beans more consistently (especially with the new probe). Thanks again
Thank you for your feedback and hope the peaberry roasting got more consistent!
Another Great Vid!!
Glad you enjoyed!
@@coffeeroastingathome8890 Do u have any experience/advice roasting Geshas? Thanks.
@@Heoi_Bikuni Thank you for your question, I didn't know about Geshas and I had to look it up. So no, I don't have any experience/advice roasting Geshas (maybe I will try it in the future)
Thank you excellent video !
You are welcome! Thanks for the feedback.
Why do we even need the ET reading? Aren't we really more concerned w bean temp? Ty! Vid is excellent!
Thanks! Yes, you are right. The ET reading does not provide much value and I tend to ignore it lately. It swings a less than the BT so it could help with the trend.
What are you use the ET probe for when it is actually not recording the ET? The best place to record ET would be at the bottom of the roaster and should show higher temperature than BT?
I am using a very similar setup on SR800, I find that my bean temp tracks very closely to the roaster air temperature dial. I am wondering what might be my issue? I have the head of the probe just above the bean mass at rest (and thus in the middle of the bean mass when the fan is running).
I have a question. I live in Europe, and use a converter. After a first attempt, I see that the highest temperature I can reach is 330F, which is not enough for a roast.
Will this extension tube help increase the temperature?
Hello, Firstly thank you for all the really good information to get Artisan working with the thermocouples and SR800. For the most part I have it all working as per your instructions and have a few roasts under my belt. One aspect of the setup which I can’t resolve is getting the event sliders to report the correct values on the graph. I did change the min/max values from 10/90 to 1/9 so that may be the problem. Apart from the first values for each slider they both report A10/B0 for each change during the roast. I notice that your values are correct so I’m not sure why mine wont report the correct values to the graph. Any guidance would be appreciated. Thanks.
Thank you for your feedback, glad the setup is working for you. For the event sliders to report on the graph, you probably need to change the min/max values to 10/90 because they report on the bottom of the temperature axis which has a scale of 0/550. Having the sliders range set to 1/9 would make the show up piled up at the bottom of the graph. If this doesn't work you can download and use the configuration file, link in the description. Hope this helps!
@@coffeeroastingathome8890 Yes that was the problem. Thanks so much. One other question I have which you might be able to help me with is with the curve filters. My thermocouples are 5/64ths in diameter, they work well but i’m uncertain about a good setting for Delta span and smoothing. I note you said the thinner the probe the more sensitive and you set yours to 1 from memory but they are much thicker. Do you have any suggestions for these values. Many thanks!
Is the temperature on the actual roaster is usually higher than the one on the thermometer?
Great video! I followed it, and all linked videos, to setup my system. However, I can't find an option to get the Air & Burner sliders on the Left side of the screen to display. Where's the option for them? Thank you!
Look under config>events>sliders.
Great videos, I’m excited to try this. Do you prefer the sr540 over the sr800? I’m looking to get a roaster and am curious if you prefer one vs the other using this setup. Thanks!
Thanks for the feedback! I only have the sr540, have not tried the sr800. If I had to do it again, I would probably purchase the sr800 because of the larger capacity, so I don't have to roast too often.
Great video. How did you get the events to show up across the bottom of Artisan? Mine attach to the BT and ET lines. Also I took to heart what you questioned on a previous video (was the ET even necessary) and just use the BT probe which makes it less confusing as I learn this. AND I've tries several probes and my MS6514 didn't like some of them so I had the enlarged hole problem as well. I used some high heat epoxy to fill the hole and then redrilled. Worked great.
Thank you for the feedback! About the events, I have the sliders work in a range of 0-100 and then set the temperature scale starting from zero, so they show in the 0-100 are of the display. I included a direct download link to the configuration file I am using in the description if you want to try it. Yes, the ET is not critical and it should be fine to start with the BT only. Good idea about the high heat epoxy! Thanks for the tip.
@@coffeeroastingathome8890 I looked at your roast log and made some changes in mine and now I have the labels on the bottom which I like better than on the Bt line. Thank you. I wish there was a way to make the fonts bigger! I tried out the new roast log today on 2 roasts and all went well....except I'm not sure my temp probes are very accurate. I'm paired with the MS6514 and not a Phidget and my first cracks are at 380 which is about 20 degrees off for this bean. I've tried several probes and am at a loss.
@@bwilliams915 Glad it worked! About the temperature, I am not sure what could cause a 5% error in the measurement. I think the important thing is for the measurement to be repeatable, and not so much the absolute value. I am not familiar with the MS6514 unit to help, sorry.
@@coffeeroastingathome8890 Also want to say that there is a facebook group for the Freshroaster called "FreshRoast Coffee Roasters". If you don't belong you might consider joining. I know your videos will help a lot of people. Thanks for your help.
@@bwilliams915 Thanks for the information, I was not aware of that group.
Can this roaster reach 220c in temperature?
How do you connect the SR800 to the computer?
It appears that the BT and ET are reversed.
Just picked up my SR540. Have the phidgets vint hub and the 4x thermocouple, plus the two K type probes. Downloaded the artisan software and have everything running. Only problem is I cannot get the delta ET to show up on the right side of the screen and the red graph line. Only the blue line and the delta BT.
Make sure in Config->Curves, RoT tab the Rate of Rise Curves and Rate of Rise LCDs checkboxes are checked for DeltaET. Hope this helps!
Thank-you for your videos, they are very well done and extremely helpful. If I have only a bean thermocouple and the temperature readout (no artisan), do you think I could control rate of change? I would record the temp and calculate rate of change every 60 seconds. Based on your videos, I doubt this would be possible but would appreciate your feedback. Anyway thanks again, really great job.
Thanks for your feedback! You might be able to a rough control of the rate of change, but I would decrease the time interval to at least 30 seconds. It could get a bit tedious to do this manually, so this is one of the advantages of using Artisan. Good luck!
Do you think it would help reduce the jump in bean temperature when decreasing airflow by switching between two air flows. For example, decrease airflow from 7 to 6 for 5 seconds, increase airflow from 6 to 7 for 5 seconds, decrease airflow from 7 to 6 until you want to drop it to airflow 5. Have you tried something like this? TXS again for such great videos. I did purchase the phigits and thermocouples, you inspired me. I just need to learn to to control ROR now.
It is an interesting thought and it might help, but I think some of the temperature jumps are because of the beans motion influencing the hot air velocity passing through the thermocouple sensor and not because of actual bean temperature changes. For example, at times the beans are blocking the air flow under the thermocouple, and sometimes they move away so a blast of hot air passes through the thermocouple. You can see this if you run the roaster without beans, the temperature behavior is a lot smoother. I may do a video about it when I have some time. So ROR control on this type of machine is a challenge, not only because of the discrete settings (which can be helped by modulating the pulse as you suggested), but also by the beans agitation. Filtering can help smooth sudden changes, but it also introduces delays that can make control difficult. Hope this helps, and good luck with the phidgets setup. It has worked very reliably for me.
Thanks so much- these videos have been incredibly helpful as I'm about to take the phidget/artisan plunge on my SR800. Quick question- the 300mm probe you have linked from Walmart- I see it says K type, but it doesn't have the two-pronged yellow connector I usually see on probes. Do I need to get any type of adapter to connect this to the phidget? Thanks!
You are welcome! Take a look at 8:13, I explained how I connected the Walmart thermocouple to the Phidget module. The Phidget module expects bare wire, so I simply bent one of the legs in the Walmart thermocouple wire termination and inserted the remaining leg in the Phidget module. There are pictures in the video that show the end result. The thermocouple sent by Phidget is already terminated in bare wires, ready to go into the module. Phidget does not use the typical two-pronged yellow connector. Hope this helps!
Great video, as always! I was quite surprised to see how easily the SR540 was able to roast 170g with no more than 30% heater power and with plenty of bean agitation. It is a 1600W heating element, correct? Ignoring the space limitations associated with blowing beans into the chaff collector, what do you think would be largest batch size you could roast?
Thank you! Yes, with the extension tube you can have more bean mass and the heating is more efficient, so you do not have to increase the heat setting very much. The SR540 is a 1,600W machine (I presume most of that is for the heating element and a bit for the fan). How much you can roast (ignoring blowing beans in the chaff collector) depends on your outlet voltage. In my house it can go up to 125 Volts. With that voltage, I think you could do 240g or perhaps more. I routinely roast 200 g without issues, but with the lowest outlet voltage in my house (around 116 Volts) it struggles a bit with bean agitation, specially at the beginning of the roast. Hope this helps!
@@coffeeroastingathome8890 good to know! My home built fluidbed roaster has an 1800w heating element, but I've always found the heater tends to max out towards the end of the roast with a similar batch size of 200g. Perhaps there are some inefficiencies in the system, or my roast profile, that are requiring too much heat input...It would certainly be nice to do a 200g batch with 30% of the heater power. Perhaps it's time for a redesign :p
How did you set up your background? How do you change it? On yours you have a green color for 100-300 degrees, yellow for above 300. I can't figure out how to do that!
There is a link to the settings I used in the description, you can download it and try it. Also, in the first video I posted (ruclips.net/video/t1X0weUSZN0/видео.html) I go into more details about the setting and how I get the background and color ranges. Hope this helps!
Kind of confused, you appear to be controlling the roaster with Artisan but the device is not listed as compatible on Artisans site, nor is Artisan compatibly listed as a feature on the manufacturers page. I am aware there is a USB port on the roaster, are you connected to it directly from your computer and it just works magically as an unofficial sampling roaster?
Hi, just to clarify I am only reading the thermocouples with Artisan, I am not controlling the fan and heat settings of the roaster with Artisan. I am only changing the slides in Artisan to match the manual change I made in the roaster using the roaster knobs. The only purpose of changing the slides is to keep a record of the manual changes I made. Hope this helps.
Phidget module at $120 seems somewhat expensive
Excellent video! I have recently made the upgrade from the original Poppery to a Behmor. I am struggling to get consistent results with Ethiopian Yirgacheffe with the Behmor. Have you tried this setup with African coffees or naturals? I am looking forward to more of your informative videos. Thank you.
Thank you for your feedback! I have not tried roasting Ethiopian Yirgacheffe yet, so I do not have any insights to offer. So far I used the method I describe in the video in 10 or so different bean types from Sweet Marias and I generally like the result. I know it is slower and darker roasting than other people prefer, but I have a stomach somewhat sensitive to acids so this method helps with that.
@@coffeeroastingathome8890 I bought a PH meter. My wife is also sensitive to acid.. I make weakish coffee (35 gm per 900ml), so the amount may have to be increased a bit.. I found that if i put 1/8 tsp of baking soda into the filter, i can get any coffee to the pH of tap water. My wife says she detects no difference in taste.... (if you want, i can brew up a batch of coffee with your preferred ration and see how baking soda you would need.
@@stephenrudolph1064 I tried that too, I have a PH meter and experimented a bit with it. I think there is more than the PH for coffee stomach irritants. I tried baking soda as well, but lately I use a product called "Prelief" if I sense that my stomach is getting too sensitive. I take it just before drinking coffee (but it is a bit of a nuisance to remember...). It has the advantage that it works for other foods that can irritate the stomach (e.g., red sauces, etc).
@@coffeeroastingathome8890 thanks for the recommendation. maybe my wife is lucky .. the baking soda works for her... but she has other issues... and maybe i will try that product if i can find it.
can i use that 300mm probe with any thermometers from amazon ? your probe seems not to have a connector for the thermometers i have seen. can you suggest a not too expensive thermometer and probe for me ? I use amazon.CA thanks
As long as the thermocouple reader works with Type K thermocouples, you can use this probe. If the connector does not work for your reader, you can probably get an adaptor. I went with the Phidgets module to read the probe, I was hoping to find a cheaper solution but since it is straightforward to use the Phidgets with Artisan I thought it was a good value. I am not familiar with other readers to make a recommendation, sorry. If you don't need Artisan, then search Amazon for a Type K thermocouple reader and pick the least expensive (with reasonable reviews...). You can find some for $20-$25 (US dollars).
how do you get the fan and heat settings into the Artisan display? Thanks for all your videos. They are great!!!!
Thanks for the feedback! There fan and heat settings in the Artisan display are changed manually (by adjusting the display knobs) after I change the settings in the roaster. They are there to keep a record of what I did, and there is no hardware communication between Artisan and the roaster fan and heat settings. It would be nice if there was, but it would be too much of a project for me. Hope this is clear (this question came up a few times, I should have explained it more clearly in the videos).
@@coffeeroastingathome8890 I understand what you just wrote, but I do not understand how you get the settings on Artisan in the first place. The fan and power settings do no show up on my Artisan display. How do you get them to display?
@@charlesboehmer4442 Ah! Got your question now I think. In the menu, go to Config->Events and click on the "Sliders" tab. Check "Air" and "Burner" and for both specify: nothing in "Action" or "Command". Offset=0.0, Factor=1.0, Min = 10, Max =90, check "Coarse" no no check in "Temp" or "Unit". Then click "OK". The sliders will not show until you press the "ON" button in the main screen. In the video description I included a direct download of the configuration file I used if that makes it easier.
Thanks so much. Worked like a charm
I am not using a probe.. Is there any way to use the sr540 temperature to determine some sort of a curve ?..
Hi, I don't know how to connect the internal sr540 temperature sensor to the Artisan program, but I suppose it is possible. The alternative is to make a curve by hand by reading the temperature display, but this is tedious. Also, the internal sr540 thermocouple measures the inlet air temperature. The air temperature around the beans is also influenced by heat transfer to the beans, endothermic/exothermic bean reactions, etc. so it would be better to measure the temperature near the bans rather than the inlet air temperature I would think. Hope this helps!
Is the phidget vint hub the best method to connect probes to the Sr roasters? Why did you selected over the tc4?
I think I my initial thought was to use the thermocouple module only, but then I found out that the vint hub was a newer alternative from phidgets which has the advantage of expansion to other module types for other applications. The price difference was not too much if I recall, so I went with the vint hub solution. Artisan has an option to automatically configure this hub. I must say I didn't find yet a reason to expand to other modules, so if your only use is for the fresh roasters then the thermocouple module should be just fine I think. Hope this helps to explain my thinking!
Do you know how well the ST800 on-board temperature measurement tracks the BT measurement? Thx for the great vids!!
You are welcome!. The on-board temperature sensor measures the inlet air temperature, before it interacts with the beans. The beans exchange heat with the air and also release steam, changing the air temperature in ways that are difficult to correlate closely with the inlet air temperature. The built in temperature sensor reads generally quite a bit higher than the BT sensor, and the temperature changes when changing settings are much more abrupt. Hope this helps!
@@coffeeroastingathome8890 Thanks you! That makes sense. BTW, you did the home roasting community a great service when you did this. Thanks for taking the initiative and putting together a clear and concise video! Michael
@@michaelready Thank you very much for the feedback!
[10:27](ruclips.net/video/xo9IdakyIqw/видео.html)
0:00 A9B1 Start Roaster
[12:01](ruclips.net/video/xo9IdakyIqw/видео.html)
1:30 ROR 85
[13:02](ruclips.net/video/xo9IdakyIqw/видео.html)
2:30 ROR 40
[13:17](ruclips.net/video/xo9IdakyIqw/видео.html)
2:46 DE
[13:46](ruclips.net/video/xo9IdakyIqw/видео.html)
3:15 A8 Low ROR 20 - Jumps to 25
[14:59](ruclips.net/video/xo9IdakyIqw/видео.html)
4:29 A7
[15:49](ruclips.net/video/xo9IdakyIqw/видео.html)
5:20 A6
[17:12](ruclips.net/video/xo9IdakyIqw/видео.html)
6:40 A5
[18:08](ruclips.net/video/xo9IdakyIqw/видео.html)
7:37 FC
[18:21](ruclips.net/video/xo9IdakyIqw/видео.html)
7:51 B2
[20:09](ruclips.net/video/xo9IdakyIqw/видео.html)
9:39 B3
[21:27](ruclips.net/video/xo9IdakyIqw/видео.html)
10:50 Second Crack
[21:40](ruclips.net/video/xo9IdakyIqw/видео.html)
11:11 Drop
hi gain. after following the freshroast forum. there is one school who prefers the high heat in the roast . slowly decreasing the heat as you go along. have you tried this method ?
Hi Stephen, I have not tried this method, with the extension tube I find that I need to keep decreasing the fan setting to avoid the beans jumping too high which also has the effect of increasing the heat on the beans (lower air velocity results in higher air temperature). So I try to keep the heat setting as low as possible to give me room to keep decreasing the fan setting, and only increase the heat setting once the beans are not jumping too much. In the end I don't think it matters how to increase the air temperature (i.e., by decreasing the fan setting or by increasing the heat setting), but keeping the beans from jumping too high will result in a more even roast and avoid losing beans on the chaff collector. Hope this helps!
@@coffeeroastingathome8890 Thanks for the speedy reply. I understand your process and i have been using that process myself.. Just to clarify my question, i have seen some people start with high heat (fan 9 and heat 9) and slowly lower the fan and the heat over time... To me.. this would have the heat stable or increasing along the roast.. and not starting at low heat with increasing heat, as you do.... I imagine the danger here is that you may roast too quickly and have the inside of the bean undercooked...
@@stephenrudolph1064 Hi Stephen, I think you are right, decreasing both the fan and heat at the same time would keep the heat more or less constant at a relatively high level. Specially with a high outlet voltage this may result in a very fast roast, with the inside of the bean undercooked as you say. When I tried fast roasts the taste was on the grassy and acidic side, which I didn't like. This may depend on the beans, but I don't have enough roasting experience to tell. With the beans I used, which tend to be low to mid-elevation, I prefer a slow roast with the heat increasing as I go.
@UCfM2lzWB7FyFriiOILjwOmQ any chance i can get your best roast file for the primos beans so i can import it into artisan and try to match it?
thanks
@home roasting at home
ok, now i'm being a pain. I've googled a hundred videos, and on 2 facebook pages.... There is EVERY permutation and combination of how to roast, and i know i can try many of these and burn through lbs of beans to experiment . I've watched your video TWELVE times, each time looking at every change in settings (although i am only going through machine temps.. no probes.).. I'm always looking for something different and i;m always finding something new in your video. For some reason , i trust your processd as I'm pretty much doing what you are doing..
anyway , maybe you can help me once again.
(send me a private message, for my modest advisory fee, which i think you deserve by now.)
so
my last few roasts(sr540 150 gm with extension) gave me city + roast (the chaff in the crack is light coloured). I pulled my beans at about 8.5 minutes.
Now, i want to go a little darker, i am not sure what to do....
My First Crack leg has the temperature pretty stable, going up a degree or two about every 10 seconds...
I'm thinking of 3 possibilities ( starting at First crack.. my process is increasing heat every 60 seconds after a 2 minute drying phase)
1) don't make any changes.. let the roast continue ... I don't think this is the best idea because maybe the temp is raising too slowly and it will take 10-12 minutes for my roast.
2) don't touch the settings while the FC is rolling.. and when FC quiets down near the end, maybe i should increase the heat till i get the darker roast i want.
or
3) As soon as FC starts rolling, i should raise the temp a bit to push the roast a bit until i like it.
( i don't think i should be going past 10 minutes... or maybe that's not a problem. i don't want to bake the beans. i know that most people like a 5-8 minute roast.
---
so if you think i should try one of the 3 options i listed.. or maybe there is another possibility ?
stephen
HI Stephen, this is why I like the probe feedback; there are too many variables that makes a setting "recipe" difficult to always work in my experience. Around FC you have a lot of things going on, for example steam escaping from the beans will mix with the hot air from the roaster and this will have the effect of changing the temperature around the beans, exothermic chemical reactions going on, etc. Sometimes this is described as "Flick and Crash" events. So you need to adjust the heat setting to compensate for these effects and avoid these sudden changes in ROR. How much to adjust depends on how sudden the steam escapes the beans, how much steam, what chemical reactions are going on, etc. This will depend on the beans and how fast you approach FC. So you can see why it would be hard to come up with a fixed settings "recipe". On top of that, I have issues with stability of outlet voltage in my house which adds to the variability. Normally I follow the idea of option (3) unless the beans are "flicking", in which case I wait until the ROR starts dropping before I increase the temperature setting. I definitely want to avoid the "crash" (sudden decrease of ROR, specially going negative!) and try to keep the ROR between 10 and 15 degrees per minute after FC, to give enough development time. To accomplish this ROR, sometimes I don't need to do anything after FC and sometimes I need to increase the temperature settings a couple of times; depends on the beans and other variables I mentioned. Hope this helps!
Thank you for your videos! I binged all of them today.
I have an SR800 in the mail and I plan on adding the extension tube in the future. Wound a long thin thermocouple like this work? I'm thinking to bend it to make it fit in the small chamber and then again bend it for the extension tube...
www.amazon.com/dp/B0874DQ3C6/
You are welcome and interesting idea about the flexible thermocouple, being a type K should work fine but if you use the Phidget module you will have to adapt the connector the the module input. Not sure how you plan to support it, the moving beans may push it around if it is too thin and easy to bend. Also you may need to use more filtering in Artisan, the thin thermocouple may respond very fast to temperature changes and give you large rate of change swings. The thicker thermocouple provides a bit of filtering by the material surrounding the thermocouple junction which smooths fast temperature changes.
@@coffeeroastingathome8890 thanks for your response! I think I'll go for a 3mm one and see if I can bend it. I'm planning to use the Mastech approach.