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General Installation Requirements for Legal for
Trade Applications
1.
General Conveyor Requirements:
a. Conveyor must be permanent construction.
b. The conveyor length shall be no longer than 1000 ft (300 m) nor shorter than 40 ft
(12 m) from head to tail pulley.
c. The scale must be so installed, that the nearest weigh idler of the scale is at
least 20 ft or 5 idler spaces (whichever is greater) from either the end of the
loading skirt boards or the head pulley.
d. Scale must be mounted a minimum of 40 ft from the tangent point of any curves
in the conveyor.
e. The conveyor must have a Gravity type take-up and that take-up must be
operating properly.
f. Material feed to conveyor to be uniform and centered.
g. The conveyor belting shall be no heavier than is required for normal use.
h. The conveyor must be covered on the top and sides for a minimum distance of
30 ft each end of the scale idlers. The side covers must extend down to a
distance approximately 2 ft below the return belt line.
i. The electrical power to the scale equipment must remain on at all times.
j. The belt scale integrator must be located under cover, preferably in a control
room, not subject to direct sunlight.
2.
Stringer Requirements:
a. The MMI Scale shall be located close to a vertical conveyor support where
conveyor stringer deflection is near zero.
b. The conveyor Stringers in the scale area should be strong enough to limit
relative deflection to 0.8 mm (1\32").
c. The conveyor stringers must be straight to prevent any belt tracking problems.
3.
Conveyor Idler Requirements:
a. The user must purchase and Install "twelve (12) Scale Quality Idlers", two idlers
to be mounted on the MMI Weighbridge and 5 idlers to be mounted on the
approach and retreat side of the MMI Weighbridge.
b. Do not use Scale Service Idlers use Scale Quality Idlers.
i. Scale Quality idlers are high tolerance idlers; for roll run-out, frame deflection
and alignment; whereas
ii. Scale Service idlers are choice idlers selected from a production run having
the best roll run-out.
c. The two scale mounted idlers must be modified to ensure proper clearance for
belt scale deflection.
d. The twelve (12) Scale Quality Idlers must be aligned to within 0.5 mm (0.02") or
better of each other.
e. The belt must remain in contact with all three rollers (center and wing rollers) of
each of the aligned idlers.
f. Idlers must be flat, 20 or 35 degree trough angle. All idlers on the conveyor must
have the same trough angle.
g. Training idlers must not be located within 60 ft of any scale weigh idler.
Page 10
Milltronics MMI Belt Scale – INSTRUCTION MANUAL
7ML19985DR02
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