The LIMAS electronic weigher is manufactured with three sizes of the weigh hopper for 10, 15 and 20 kg. The weigher has a coarse feed and a fine feed.
The vibrator feeds the product through the metering gates from the receiving hopper into the weigh hopper, which is mounted on a load cell. Initially, all 3 lanes of the vibrator are used as a coarse feed. At a pre-determined point close to the set weight, two of the vibrator lanes are blocked off and the third lane gives a fine feed.
At the set weight all three lanes are blocked off and the machine pauses until the proximity switch is manually operated. This allows the operator the freedom to deal with the last full bag while the subsequent one is filling, and then to place a new bag under the filling funnel before operating the proximity switch again.