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weigh scale mountaing
WEIGH SCALE CALIBRATION-cont. - TM-5-3895-374-24-2_639

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 MODEL WB INSTALLATION, ALIGNMENT, & CALIBRATION CONVEYOR WEIGH SCALE 5-0 WEIGH SCALE FINAL ALIGNMENT 5-1) Align the 3 effective scale idlers using a string or fine wire as shown in drawing # WB00-0006 "Customer Weigh Scale Installation". 5-2) Shim the scale idler to the same height as the approach and return idlers. 5-3) 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. 6-1) 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.) 6-2) 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. 6-3) 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. 6-4) 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)







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