Position: Content of this page:In conclusion of the given article it is necessary to tell about one else factor influencing on belt weigher accuracy. This factor is -- how many belt weigher is composed of weighing idlers. In many published works it has been spoken, that the more weigh idlers belt weigher contains the same rate better an accuracy.
Basically you can manage yourself to test this idea independently with a complete set of calculations. The technique is clear for you (I hope so). I suggest you look at the scheme for two-idler belt weigher shown on fig.11. There is visible, that magnitude of the adverse factor of a belt tension remains the same 
for at twice increased weighed loading 
. From here an error estimation of two-idler belt weigher might be decreased twice. The same rate an belt scale accuracy might be better (theoretically).
Figure 11: Two-idler belt weigher theoretically improves accuracy twice.
Why ``might'', instead of it ``should be''? Because, sirs, a conveyor belt -- is not a flexible string and belt weigher is not obliged and shouldn't submit completely to expressions obtained above.
Therefore, if sale manager will persistently offer you three-roller belt weigher as three times more precocious as contrasted to one-idler, replay to him so that you barely believe it. Though it can be accepted as scientific fact that multiple-idler Belt scale (more than 2-idler) has far more better weighing accuracy performaces. How it's far is far? It's complex question and subject for further discussions.
