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1. KBU / KBO Principle
Hoopman calibrating units are available in two standard principles. The KBU and the KBO versions. The main difference between the two principles is that the KBU sieves the throughput of sieve one on the second sieve and the KBO sieves the overflow of sieve one on the second sieve of the unit.
This means that the KBU starts with the biggest perforation screen to perform a higher accuracy because the big particles are out of the product flow after the first sieve (pict. 1, A). The throughput goes onto the second screen of the unit. The to small particles go trough the second sieve and go into outlet B (pict. 1, B). The good particles between the first and the second sieve go into outlet C (pict. 1, C). When combining multiple units you can sieve into more fractions, for example you can connect outlet C to a next unit and get a next fraction sieved.
The big advantage of the KBU system is that with seed lots with up to 50% big fraction, these are the seeds first getting out of the product flow. This way you have more accuracy / capacity on the following screens.
The KBO system has a different flow than the KBU system, with the KBU system you first sieve out the to small particles into outlet A (fig 2, A) and the overflow of the first sieve goes onto the second sieve. On the second sieve the product between smaller than the second sieve (normally the good product) goes into outlet B (fig. 2, B) and the to big product goes into outlet C (fig. 2, C). By combining several units you can increase the fractions sieved on one machine.
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 Sieve principle KBU and KBO
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