20 Oct 2011
Yeast dosing in a brewery
Place of deployment: After the separator
Beer is removed from the storage tank and fed to the separator. After the separator the beer has a turbidity of approx. 10 EBC. After the separator the metered addition of yeast is performed and the beer is then carbonated (CO2 is added). The beer is finally bottled in the filler. The measuring function of the ITM-4 consists of controlling the yeast dosage.
Shortly before the ITM-4, bottom yeast is fed to the separated beer from a separate yeast tank, this being defined by way of a dosing pump. With the turbidimeter ITM-4 the yeast turbidity is recorded and an appropriate metered addition of yeast is performed, this being dependent on the turbidity value. In this brewery the setpoint is 90 EBC for Kellerbier.
The ITM-4 was able to convince this customer thanks to the following features:
- Easy handling and operator control of the device.
- The measuring operates independently of the beer type and beer colour, i.e. the measuring does not have to be adapted for pale or dark beers.
- In addition to this there is a price advantage and easier installation in comparison with the competition.
Control of the lauter process
Place of deployment: In the brewery immediately after the lauter tun
The mash is conducted from the mash copper with the addition of water into the lauter tun. The draff (husk residue from the malt etc.) sediments in the lauter tun and collects at the bottom of the tun. The outfeed of the lauter tun is also at the bottom of the tun. After the lauter tun the medium (wort) is passed into the wort boiler and then boiled. when medium is removed from the lauter tun, this process is called ”sparging” or ”lautering”. The draff layer has the function of a filter in this process. At the beginning of the lautering the medium is turbid and then gradually becomes clearer. Only a little turbid medium should be allowed to get into the wort boiler.
The Anderson-Negele turbidity meter ITM-4 is installed between the lauter tun and the wort boiler. The limit value for this customer is 30 EBC.If the turbidity is greater than 30 EBC, the medium is not pumped into the wort boiler, but is recirculated to the top and back into the lauter tun. If the turbidity is less than 30 EBC, the medium is conducted into the wort boiler by switching over a valve.
The turbidity value is monitored during the entire removal process. If the value rises above 30 EBC, because, for example, part of the draff has detached itself, a switch back to recirculation is performed until the turbidity is below the limit value again.
The Anderson-Negele turbidity meter ITM-4, installed immediately after the lauter tun, enables exact and reproducible monitoring or control of the turbidity of the wort that is pumped into the wort boiler. If the turbidity is too high, recirculation takes place. The wort is not passed into the wort boiler until the turbidity is correct.
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