Application Special : The Sigrist TurBiScat In-Line Turbidimeter - 29/11/2013

KC Controls

Application Special
Enhance shelf life and appearance by monitoring filter breakthrough Turbidity levels
The Challenge
Filtration of beer should result in brilliant clarity which is then microbiologically acceptable. Ensuring your product is filtered to the highest standard is hugely an important step in the brewery process; shelf life and appearance can be impaired by the presence of protein/tannin colloids, yeast cells, and filtration auxiliary particles
The Solution
The Sigirst TurBiScat : shelf life and appearance by filtering to the highest degree
Since turbidity problems resulting from deteriorating qualities of malt occur more frequently, good turbidity measurement is becoming increasingly important.

Classical beer filtration consists of at least one Kieselguhr filter which is mostly followed by a fine filter and, in larger breweries, also by a PVPP-filter for stabilization. The outlet of the Kieselguhr filter is the most important location for measuring turbidity.
In the filter, the highly porous Kieselguhr frees the turbid non-filtered beer from a large number of turbidity producing substances. This includes particulate substances such as yeast as well as dissolved (colloidal) turbidity producing substances such as proteins and glucans.

Turbidity measurement also has to permanently detect small changes in the turbidity of the filtrate in order to inform the operator as to how the filter has to be controlled. If the 90° proportion of the turbidity rises, e.g. the Kieselguhr mixture consisting of coarse and fine Kieselguhr has to be altered. If the 25° turbidity value rises relatively suddenly, this can mean a so-called filter breakdown. The filter then automatically changes to recirculation with continuing dosage of Kieselguhr until the damage to the filter cake has been closed.

Thus, the measured turbidity values are the most important indicators for the amount and mixture of the filter additives.
The Benefits

Whilst the saving potential of this application cannot be directly calculated, the advantages, however, can be made clear using several aspects:

The best filtration is reached when the turbidity is as good as necessary, the trub volume of the filter is filled to the maximum with filter additives at the end of the filtration, and the filter has reached its optimal possible pressure. To achieve this, Kieselguhr dosage has to be controlled permanently. In this, the turbidity and the rise in pressure over time are most important.

If, as a result of monitoring these measured values, good filtrations can be extended to 24 or more hours, it becomes clear that, as compared to bad filtrations of only a few hours duration, the set-up times, cleaning agent consumption and, last but not least, the loss caused by the first running and the after running can be significantly reduced. Furthermore, filter additives can be saved if filtration is not carried out to the extreme. The aspect of quality is self-evident even if it is difficult to put an exact monetary value to it.

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