Rice Lake Weigh Modules/Mount Assemblies - Manual (Page 37)

WEIGH MODULES
2-8
Single-Ended Beams
Paramounts ® HS & Paramounts ® EP
The versatile Paramounts vessel weighing system consists of three
different modules, which together make a complete system of fixed
and sliding modules with single-ended SB4 or SB5 load cells. This
unique system allows a vessel to expand freely on sliding modules,
yet the system is self-checking. All models are available in capaci-
ties to 22,500 lb.
RICE LAKE WEIGHING SYSTEMS Rice Lake, WI 54868 U.S.A.
Patent #3960229 Paramounts TM
Figure 2-13
Allowable Movement
A: FIXED PIN B: FREE SLIDING C: SIDE STOP
Figure 2-14
a) Fixed Pin Module - With the fixed pin module, the load is
transferred from the top plate to the load cell via a load pin
which enters a counterbore in the top plate and load cell. The
pin acts as a pivot point and only allows the top plate to rotate
while fixing that corner of the vessel.
b) Free Sliding Module - With the free sliding module, the load
pin has a flat top surface on which the top plate is free to slide
in all directions. To minimize friction, the top surface of the
pin is Teflon
® -coated and slides on a smooth stainless steel
slider plate. The cleanliness of these two surfaces is assured by
a neoprene suction seal.
c) Side Stop Module - The side stop module uses the same
Teflon
® -coated pin and stainless steel slider plate, but in
addition it has side bumpers. These bumpers check the top
plate movement laterally. The top plate is checked to move
only in the direction of the longitudinal axis of the load cell.
A three-cell system uses one of each style of module; all additional
modules are free-sliding.
Construction and Features
1) No Torsional Effects: All SB4 load cells incorporate a blind
hole for load introduction. The load is introduced via a convex
loading pin as seen in Figure 2-15. The convex surface allows
the module’s top plate to rock without twisting the cell. The
load pin is centered in the load hole by a pliable polymer “O”
ring. The bottom of the blind hole is located on the neutral
axis of the SB4’s sensing section. Therefore, torsional effects
are virtually eliminated.
Figure 2-15
2) Jacking Screw and Lift-Off Protection: Each module consists
of a base plate to which the load cell is screwed and a top plate
through which the load is introduced; see Figure 2-14. A
safety check screw is rigidly fixed to the top plate and passes
through a large clearance hole in the washer plate attached to
the base plate. This screw prevents lift-off and also may be
used to jack up the empty vessel for load cell replacement.
3) Allows Movement: There are three different styles of mod-
ules resulting from differences in the top plate and loading pin
design. Each serves as part of a complete system that allows
free movement of the attached vessel.
4) Matched Outputs: The SB4 and SB5 load cells are matched
output, stainless steel load cells. All Paramounts load cell kits
use SB4 or SB5 load cells with outputs matched to
±
.07%.
This eliminates the need for corner trimming at initial instal-
lation or recalibration when a load cell is replaced.
5) Withstands Hostile Environments: Paramounts HS are avail-
able in mild steel or stainless steel with hermetically-sealed
stainless steel load cells. Paramounts EP models come stan-
dard with stainless steel, environmentally-protected load cells.
6) Available in capacities to 22,250 lb in either mild steel or
stainless steel.