INSTALLATION, ALIGNMENT, & CALIBRATION
CONVEYOR WEIGH SCALE
5-0 WEIGH SCALE FINAL ALIGNMENT
Align the 3 effective scale idlers using a string or fine wire as shown in drawing # WB00-0006 "Customer Weigh
Shim the scale idler to the same height as the approach and return idlers.
Tighten the (4) 1/2 x 2 1/4 bolts connecting weigh scale to the conveyor. Verify alignment of strings A, B, and C.
6-0 WEIGH SCALE CALIBRATION
Note: There are many factors affecting the weighing accuracy and stability of a conveyor belt
scale. Scale height is only one of these factors. Other factors include stiffness of the belt,
the type and number of splices, the rigidity of the structure, and belt speed and tension. It
must not be assumed that the installation of the scale can correct errors caused by these
other factors. If known problems with the conveyor exist, they must be corrected prior to
running calibration procedure 6-0. If sufficient scale accuracy cannot be obtained after
completing procedure 6-0, other conveyor factors should be suspected. Contact your
dealer for assistance if accurate and dependable operation cannot be realized.
Calibrate the scale by measuring a weighed load sample collected at the maximum aggregate rate required by the
plant capacity. Repeat the calibration tests as required to assure accuracy and repeatability.
Note: Obtain largest practical sample. (15 to 20 tons is generally sufficient.)
Take a second weighed load sample at 1/2 maximum rate. If indicated sample weight is greater than the actual
sample weight then the weigh scale is too "high". Lower scale 1/16" on both sides and repeat.
If indicated sample weight is less than the actual sample weight then the weigh scale is too "low". Raise scale
1/16" on both sides and repeat.
Repeat procedure 6-1 through 6-3 until scale is in best possible position.
SYSTEMS Equip. Corp.
Tel: (319) 568-6387
WB, 921006, page 4
(page 3 - 1272)