Volumetric and gravimetric feeders control system

a gravimetric control system provides a great deal of feedback in the way of alarms . documentation and inventory control . for example , if a manufacturer is required to provide ongoing process docu - mentation or validation to customers , then gravimetric control is the only option gravimetric control is the only option vices such as a level probe or flow - no . flow devices . that can be added to a volumetric system to help improve process control , they all have certain limitations and cant replicate the results achieved with gravimetric control.

Volumetric and gravimetric feeders have a major cost difference primarily because of the more complex controls required for the gravimetric feeder that may not be necessary for the volumetric feeder . a basic gravimetric feeder is two to three times more expensive than a similarly sized volumetric unit , depending upon the operating requirements of each and don ' t forget operating costs : if your raw materials are expensive , over - or underfeeding may have a significant impact . also , closely reg .ulated industries are required by law to have records of influent and effluent flows ,so a closed - loop feedback system would be necessary .