They are mainly used for production control of dry bulk materials within the product flow in industries.
It basically consists of a vessel supported on load cells, with a feed valve and a discharge valve, both controlled by pneumatic actuators. This vessel is covered by a chassis with doors on its sides.
It has a control electronics that allows it to operate in 2 ways:
1- As a flow scale:
in this case, it requires an upper and a lower hopper, to accumulate product. Operating in this way, the operation cycle is as follows:
- The empty weighing vessel is tared.
- The loading gate is opened.
- When the loaded product reaches a predetermined weight value, the loading gate closes.
- The weight is checked and added to the accumulated weight.
- It is unloaded and the cycle is restarted.
2- As a bagging or batch scale:
In this case, an upper tank with a dosing element such as a screw conveyor is required. The operating cycle is as follows:
- The empty weighing vessel is tared.
- The signal is sent to start loading.
- When the weight reaches the preset value, the stop loading command is given.
- The weight is checked and added to the accumulated weight.
- If necessary, the parameter of the next weight cut command is corrected.
- Unload and restart the cycle.
