As with powders, liquid weighing systems are designed around a central weigh hopper with liquids being dispensed via pneumatically operated feed valves. Liquid feeds may be supplied from bulk storage tanks, intermediate bulk containers or standard drums with delivery pumps to suit. For multi-batch operation systems the weigh hopper can discharge into an intermediate holding vessel situated beneath. From the holding tank the liquid is pumped on demand to the downstream process. Complete discharge of the liquids and line cleaning is achieved utilising low level probes and air operated purging systems.
Both weigh hopper and holding tank are housed in a free standing enclosure which may be fitted with electrical heating and insulation for the handling of more viscous oils.
Solid material batch weighing systems generally comprise of a belt conveyor mounted on a multi-point weigh frame and provide weighing and transfer of batches to the downstream process. Loading can be performed either manually by the operator or via an automated conveyor system.