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Sit series inventory & density monitor unit – Sterlco SIT Inventory Monitor Units User Manual

Page 8

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SIT Series

Inventory & Density Monitor Unit

8


General Description of OI Series System

The SIT Series inventory control system is used for in line process system weighing and
totaling of resin usage.

The modular unit is equipped with a material supply hopper, with a discharge-metering
valve, mounted over a batch weigh hopper. An adjustable level sensor is mounted on
the weigh hopper.

The SIT Series system is mounted over a holding hopper or processing machine hopper
and is provided with a proximity sensing level switch that is field mounted into the lower
holding hopper.

When the level switch is uncovered with material, the unit will start its cycle.

1. The pre-filled upper supply hopper dump valve will open.
2. Material will flow into the weigh hopper below until the level is reached at the

proximity sensor. The level sensor proximity switch controls the batch size.

3. The computer control will shut off the upper material supply hopper dump valve, and

read the weight in the weigh hopper after settling has occurred.

4. The computer will record and totallize the weight.
5. After the loaded weigh hopper has been weighed, the discharge valve on the bottom

of the weigh hopper will open. The valve will stay open until the material has been
emptied into the lower holding hopper.

6. When the scale has sensed that no material is remaining in the weigh hopper the

discharge valve will close on the weigh hopper.

7. The computer control will check the level sensor in the holding hopper and when the

sensor uncovers due to material leaving the holding hopper, the inventory unit cycle
will repeat as in steps 1 - 6.


The system can be tied into a central computer for total material flow monitoring, or can
be used as a stand alone inventory unit.

The standard unit is provided to work with any vacuum loading system, as the system
will have its own level control to keep the upper supply hopper of the SIT Series unit full.