Chocovision X3210 or Delta good for Bean to Bar?
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Tech Help, Tips, Tricks, Techniques
The easy answer is yes. But it's a lot more complicated than that, and FBM does make a machine, the Unica, which has 3-zone tempering.
From looking (and working with) the control panels of various FBM machines I can tell you that the temperature range is far wider than 30-45C. I know that the upper end of the range is closer to 60 and that can be modified. One customer here in the US is working with a chocolate that wants to be at 70C! FBM provided a way to override the default programming to accommodate the higher melt point as well as provide additional heating elements to the working bowl to reach and maintain that temperature. If you are working with a chocolate made with no extra cocoa butter, then the working temperatures are going to be on the low side. Perhaps surprisingly low.
It also makes a huge difference where the final temperature sensor is, and how heat is applied to raise the temperature of the chocolate coming out of the tempering (cooling) pipe. It does no good to have it right at the top of the pipe, you need it as far along the output path as possible and you need a method of warming that is highly responsive and very precise.
It turns out that the geometry of the 2-stage systems is such that the third temperature zone happens automatically. Interestingly, the FBM Aura with its extra-long spout does a really, really good job in this respect.
What most people don't realize about continuous tempering machines is that there is a delicate balance that needs to be created to effect the continuous tempering cycle. More reactive and more precise control over temperature is most important. Also, the geometry of the auger in the tempering pipe is important because that determines the ability of the crystals that are formed along the pipe walls to spread to more chocolate. You can make the core diameter smaller to increase the amount of chocolat being pumped, but that means fewer crystals in the chocolate when it leaves the pipe. Making the core diameter of the auger greater reduces the amount of chocolate being pumped in any given time, but the quality of crystallization is better. If you have the ability to control the rotation speed of the auger, even better.
So - you can't just look at one specification and say that machine A is better than machine B. Tempering is a dynamic system and all of the elements play a role. Keeping the temperatures balanced precisely within a narrow range over the course of the day could be more important than the issue of 3 zones over 2.