6.WEIGHING MODE SETTING AND OPERATION
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6-1-2. Discharge Weighing
This method controls weight of the metering tank (e.g. hopper) as it discharges
material to the container. The metering tank is fed with the material from the raw
material storage before discharging process begins.
Example of discharge weighing
In Discharge weighing, the amount of discharge can be weighed by adding
negative weighed values. In this example system, raw materials are to be fed
from the raw material tank to the metering tank, and a fixed quantity of raw
materials are to be discharged from the metering tank to a container. At first, the
Discharge valves of the weighing tank are to be fully opened to discharge raw
materials, and the Discharge valves are to be closed in the order of large
→
medium, and medium
→
small at the time of Final-Set point 1, and Final –Set
point 2, respectively. The Discharge valves are to be completely closed at the
time of Final-FF CPS., when one measurement is completed. When the weighing
tank runs short, the feeding valves are to be opened to replenish the metering
tank with raw materials from the raw material tank to weigh.
F159
Raw material tank
Feeding valve
Metering tank
Summing
box
Load cell
Discharge valve
(SP1, SP2, SP3)
Container
Belt conveyer
