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Lelit Bianca

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double boiler lelit pressure profiling
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144K views 757 replies 100 participants last post by  yahyoh  
#318 ·
I know that the device can improve a lot, with time I will try to do something better. What seems obvious is that the thermosyphon does not work properly.

I have removed the top cover of bianca and I have not seen water filtration or dry residue

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#316 ·
DavecUK said:
You need to be a little more informative.

What was the temperature you set.

What was the paddle position

What was the flow rate

What were you using to measure the temperature

Otherwise i just see two temperature readouts and a towel?
Click to expand...
Sorry dave

The temperature is 94 degrees with ec = 13

The paddle position is almost all open

Flow rate without filter 75 g 10seg aprox

For measure temperature use k type themocouple in a blind filter with a small hole with a small base emulating the coffee pill

The towel... Pressurized water goes a little crazy jajaja Excuse me if I'm a little sloppy

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#309 ·
DavecUK said:
I don't know, all I do know is my settings are absolutely correct for a properly working Bianca. it has a large thermosyphon pipe and you don't want it too hot. I did 3 or 4 days just temperature testing. However, it's your machine, your tastebuds and used your way. If you like an offset of 13 or 14, then that's fine.
Click to expand...
Thank you for your time dave, when I have more results I will let you know.

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#307 ·
DavecUK said:
All looks good apart from EC which should be 10. The machine must warm up for 30-40 minutes, 10C is the correct setting....too high a temperature as you are using will not give correct results and the group head thermometer is not the way to monitor for correct temperature. I measure it 3 mm within a simulated coffee puck.

If you are getting inconsistent E61 temperatures you have a small leak somewhere in the brew circuit, enough to cause the boiler level to stop slightly. One of the issues with almost all vertical boiler machine that have their thermosyphon take off on the top of the boiler is a slight drop in water level causes thermosyphon inconsistency and if it goes down more...stall. As any of these machines age, these maintenance issues become more apparent and performance limiting until the source of the poor sealing is identified and rectified. This is common to every vertical boiler dual boiler machine I have ever used apart from machines where the take of is at the sides, or the ACS Minima where I ensured the design places the top thermosyphon tube at least 3 cm into the boiler, using a special fitting made for the purpose. Fortunately I have a lot of influence with the ACS designs and it's the reason the production machine took so long to come to market from beta 1.

P.S. If the thermosyphon is stalling slightly or a lot...it will of course negatively affect brew temperatures.
Click to expand...
Thanks for the response Dave, as for the Ec if I do not modify it to 13 or 14 the temperatures are very low. Within a short time I will try to have more reliable readings with a more precise thermometer and measuring from the portafilter.(fluke t3000) I have to think about how to install the temperature probe in the portafilter

I have contacted lelit and sent me to the distributor in Spain.

Is there any way I can observe if there is water loss or other anomaly?
79c6f92fa6ba5ba368e0cd60f59d5007.jpg


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#300 ·
DavecUK said:
It would be helpful to know how the machine is set up in the LCC (all the settings). Without this I have no idea.

Also degrees C or F and which country /retailer
Click to expand...
Hi dave,

KPc = 0.4

Klc =0. 04

Kdc=12

Bc=15

Ec =13 or 14, if i dont modify very low extraction temperature

Celsius

Spain 220v

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#298 ·
Hi i've got bianca since June 2018, I began to notice changes in the taste of my shots with the same routine. I removed the pressure gauge and installed a temperature clock like Eric's. I observed 2 problems, the temperature was 4 or 5 degrees higher than the selected one.

Which I can correct through the Pid.

The second and most important problem is that the thermosiphon of the e61 is not thermally stable, which conditions that the extraction fears a different temperature or another.40 minutes after turning on the temperature of the thermosyphon, varying sometimes being 85 degrees and other 90 degrees

This week I will have a professional temperature reader and I can do more temperature readings

If someone can help me or guide me. @DavecUK

Thanks

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#166 ·
DavecUK said:
Yeah a shot like that is no problem. It can also do slayer style shots no problem as well.
Click to expand...
Dave, a question.

I have two occasions that when I run out of water, it spoils my shot. If I remember correctly, before there was a lack of water but I could finish the shot ..

Could it be that the 70 liter lelit's filter has picked up air?

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#146 ·
DavecUK said:
Theres no way you guys could have read it all and watched all the Videos....<sigh> have I wasted my efforts again.

I may do some more videoed profiles, it does take some time. L:elit have a Video with a few examples. I'll be quite honest though, although there are lots of ways it could be used. I think the best results will be pure manual control via the paddle and variations on what I have already done e.g. loooonger infusions, or shorter....slower or faster ramp rate, then controlling max pressure and the drop rate. Some of the other things might well be likened to driving a rally car with your feet because you can, not because it's better!

Perhaps I'll do some more B&W slo mo shots wiv music
;)


Seriously though, I thought it was a really good machine, rather have that than many many other machines on the market, a lot of them costing more money. As for a V vs B comparison, don't ask me, I like them both for different reasons, If I didn't I wouldn't own one of each would I?

</sigh>
Click to expand...
I feel sad to see that you think that I have not seen all the videos, I already tell you that I have seen them , except the tours of the machine.

Your work seems very important to me to minimize it by not seeing it. If I say that I will see them again patiently, because the English language is not my mother tongue.

I would never ask for a comparison between vesuvius and bianca.

Best regards.

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#81 ·
Nikko said:
That is true. If you are in a hurry low pressure preinfusion may not be for you.
Click to expand...
Maybe with some origins with medium roast can lengthen the shot. My impression with the Italian blend is that if we take more time it remains bitter.

Example, huahuatenango origin


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#78 ·
Nikko said:
If you want to pre-infuse at a lower pressure, then you need to start with the paddle in a position somewhere to the left (to give the pressure you want) and leave it there for the duration you want. Then open up to let the pressure rise.

.
Click to expand...
If you put the paddle to the left from the beginning the flow is so low that it will take a long time to fill the water chamber and take pressure

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#75 ·
DavecUK said:
He is just coming to terms with the differences of flow control and a PD pump set to constant 9 or 9.5 bar vs true pressure profiling using a computer, pressure sensor and gear pump. If you understand what's happening or why, it becomes easier to find a routine that works well..It's why this is one of the longer and harder reviews I have to do for BB, plus the user guide is going to be more difficult than usual.
Click to expand...
Exactly, I already understand the difference. But your help on how to shoot will be welcome.

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#71 · (Edited by Moderator)
As far as my expertise goes, it is not possible to reproduce or I do not achieve the profile curve of a normal e61, since the 1st coffee compaction although the paddle needle has decreased the flow does not manage to break the resistance of the tablet and the pump, let's not forget, keep working as we have it, in my case 9.5 bar.

Sorry, It is possible that so much technicality does not translate correctly into the English language.

I hope that @DavecUK makes a revision of the machine soon, because there are several concepts of the machine that I do not have clear.

At the moment the advantages are for ME:

-Very silent and nothing vibrates

-Thermal stability

-Pid very complete

-Dual boiler!! Power steam!!

Things that I do not like or I still do not know the secret:

-I can not play the profile of e61 lelit mara, which I loved so much

-In general, even using the naked portafilter, I do not get so much cream

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#66 ·
Stanic if you need something else ....

For now I have canceled the preinfusion. I'm playing with paddle and it's complicated for me, to see if someone with more expertise teaches us something.

Opv 11bar

77ee8bc7c4609a1c0d8dacf0a1694238.jpg
343ffb760ff6ddf66b49f9ee1b7926b5.jpg


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