Weigh modules – Rice Lake Weigh Modules/Mount Assemblies User Manual
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WEIGH MODULES
2-14
Double-Ended Beams
6)
A scale using this module must be checked along the longitu-
dinal axis of the load cell to prevent over-travel. Stay rods or
bumper bolts may be used.
7)
The module does not provide lift-off protection which, if
required in a vessel weighing application, must be provided
externally.
8)
The cast iron TSA modules use the Sensortronics 65058
double-ended shear beam load cell, which is made of high
alloy steel.
Typical Application
TSA Truck Scale Modules
The TSA load cell module is used primarily for truck scales, and in
certain applications for vessel weighing applications. The modules
are constructed of cast iron, and are available in load cell capacities
from 10,000 lb to 75,000 lb. The Unilink design provides freedom
of movement in the longitudinal direction while also being self-
centering, making this module ideal for vehicle scales.
Figure 2-26 illustrates the TSA module. Unlike the double-ended
beams used for the RL1600 or EZ Mount 1, the TSA module should
be mounted with the greatest expected movement aligned with the
longitudinal axis of the load cell. In a truck scale, this is normally
in the direction of truck travel.
Allowable Movement
Figure 2-26
Construction and Features
1)
The load cell ends are screwed to a rigid U-shaped base plate.
2)
A link sits over the center of the cell which has a radiused
groove at the center. The bottom of this link has two saddle
blocks which project outwards. The top girder chair assembly
sits on these ears.
3)
The module is free to move in the directions indicated in
Figure 2-26.
4)
Because the load is suspended by a link, the scale is free to rock
back and forth along the longitudinal axis of the load cell.
Because of the pendulous action of the link, the scale will
return to its original position after being displaced along the
longitudinal axis of the cell.
5)
When a number of modules are fastened to a deck, the
modules are restrained from rocking laterally.
Figure 2-27: TSA modules in truck scale