Control indicator and loadcells, fitted to a pneumatic pumping system for filling bags.
On starting, the bag is filled to a pre-set point where bulk filling stops and fine filling starts, until the final desired weight is reached.
The system then stops until the filled bag is removed and is then manually restarted after a new bag is inserted.
Typical accuracies are +/- 20 g on a 25 kg bag.
Commonly used for filling bags of sand, etc.