Rice Lake Z6 Single-Ended Beam, SS Welded-seal, IP67, OIML C3 - Manual (Page 27)

Weigh Modules: Single-Ended Beam 23
Figure 14-6. RL50210 TA on Conveyor
14.6 RL1800 Modules
These modules use single-ended beam load cells in
center-pivoted modules with capacities up to 10,000 lb per
module. While these are compression-style modules, the cell
is actually mounted in tension since the load is introduced
through a center loading bolt in a hanging trunnion suspended
beneath the load cell. The trunnion can pivot in all directions
on a set of spherical washers, allowing the top plate (attached
to the vessel) to rock without twisting the load cell. This
arrangement makes the modules self-centering, and able to
accommodate movement in all directions. This module is
self-checking and provides lift-off protection.
RL1800 modules allow the installer to adjust overall height
easily with a center loading bolt that is attached to the hanging
trunnion. This adjustment feature speeds the process of
equalizing the load between all modules. These modules allow
load cell removal and replacement without raising the tank – an
important consideration in some installations. See Figure 14-8.
Allowable Movement
Figure 14-7 illustrates the RL1800 module with arrows
indication allowable movement.
Figure 14-7. RL1800
Construction and Features
1. A base plate and spacer support the load cell.
2. A trunnion block is suspended below the free end of
the cell and is attached to the cell using a bolt in
tension which is screwed into a threaded load hole.
A spherical washer set is placed between the bolt
head and block.
3. A chair arrangement is attached to the trunnion
block through pivot screws, and the load is applied
to the top plate of this chair. This arrangement
allows the chair to move in the directions indicated
in Figure 14-7.
4. Because the load is suspended from the underside
of the cell, the module is self-centering; that is, after
a disturbance temporarily moves the top plate
laterally, it will tend to return to its original position
under the influence of gravity.
5. The module provides lift-off protection and lateral
restraint.
6. The module provides height adjustment.
7. This module can accommodate a broad range of
alloy steel, stainless steel and hermetically sealed
stainless steel load cells.
8. The RL1800 module is available in capacities from
250 lb to 10,000 lb in both mild steel and 304
stainless steel.