Sterlco SF1000 Gravimetric Additive Feeder - Manual (Page 24)

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5. Maintenance
5.1 Static calibration
Static calibration is the procedure that ensures that the weighing system is calibrated.
Static calibration should be performed under the following circumstances:
a)
Upon first installation of the equipment.
b) Any time the unit is dismantled and reinstalled.
c) After replacing the load cell or the controller.
d) Periodically, according to the company’s Q.A. policy, but at least once a year.
The procedure for static calibration is described in Appendix B.
Note: It is recommended to check the calibration periodically by inserting a standard weight
inside the hopper (no need to empty it), and verifying that the change in the value of
"Weight" value matches the added weight. If there is a deviation, a static calibration
procedure should be performed again.
5.2 Emptying and cleaning (see Fig. 2)
a) Place a bucket under the emptying aperture.
b) Open the emptying aperture (10). The MB in the weighing hopper will fall freely.
c) In order to remove the MB residue completely, release the gear (11) by opening its two
quick latches, take out the dosing screw (9) and use an air hose for final removal of all
additive residues.
d) Reinstall the dosing screw and the gear.
5.3 Replacing the dosing screw
The machine may be equipped with four alternative dosing screws, according to the
customer’s request (see section 2.2 of technical specifications - available dosing screws).
To replace a dosing screw:
a) Empty the hopper via the emptying aperture (10).
b) Release the gear (11) by opening its 2 quick latches and take out the dosing screw (9).
c) Release the screw from the shaft and replace it with the new dosing screw.
d) Return the screw and the gear to their positions and fasten the two quick latches.
e) Verify that the screw's number setting has been updated in the controller (see 4.4.2)
according to the new screw.
Note: Any time you insert new material into the empty hopper, or replace a screw, it is
recommended to refill the screw with material before starting the operation in order to
minimize the first rejected uncolored cycles.