Flocculators with Independent Positions - FC S Series

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Flocculators with independent positions that allow standard conditions to be adopted for jar test, that are the basic requirement for reproducible results.


Independent Control

  • Independently selectable speeds 10-15-30-45-60-90-120-150-200 rpm
  • Optional maximum speed of 3oo rpm upon request
  • Same product can be submitted to different conditions in parallel
  • Reliable and repeatable results from VELP stirring quality
  • Precise speed from an electronically controlled DC gear motor


Practical Operation

  • Choice of 4- or 6-place models
    JLT4, 4-position jar tester
    JLT6, 6-position jar tester
  • Speed can be changed during the run
  • Illuminated back panel to simplify sample observation
  • Stirring rods adjustable in height without tools


Robust Design

  • Strong resistance to chemical and mechanical corrosion




Construction material Epoxy painted metal structure
Models FC4S: 4 positions
FC6S: 6 positions
Back panel disconnectable illuminated
Stainless steel stirring rods Adjustable in height by a selfblocking chuck
Pluriselector settable individual speed for each rod
Power FC4S: 18 W
FC6S: 23 W
Weight FC4S: 12.5 kg
FC6S: 18 kg
Dimensions (WxHxD) FC4s: 645 x347 x 260 mm
FC6S: 935 x 347 x 260 mm



Electronic speed control from 10 to 300 rpm
Electronic speed control 20 - 40 - 50 - 100 - 200 rpm
Speed setting interval 1 rpm
Microprocessor controlled timer 0÷999 min or 0 ÷99 hours (or continuous)




Independent Positions

FC4S and FC6S, 4- or 6- position Floc Tester, permits changing of the speed during operation, up to 200 rpm.

Settable individual speed for each rod means that every single position is independent for the others.

In addition, the user can program the operating time for unattended operation. When time expires, stirring will be stopped automatically.

An illuminated back panel simplifies the observation of the samples, whilst height adjustment option for the stirring blades during operation increases its capabilities.




Jar testing is a pilot-scale test of the treatment chemicals used in a particular water plant. In few words, it simulates the coagulation/flocculation process in a water treatment plant, helping the operator in the determination of the right amount of treatment chemicals, and, thus, in improving the plant’s performance.