Rice Lake Z6 Single-Ended Beam, SS Welded-seal, IP67, OIML C3 - Manual (Page 32)

28 Load Cell and Weigh Module Handbook
15.0 Weigh Modules: Double-Ended Beam
15.1 Introduction
Double-ended shear beams are medium- and high-capacity
workhorses that are rugged, stable, and able to handle side
l o a d s w e l l . T h e m o d u l e s c o m e i n t w o v a r i e t i e s —
e n d - s u p p o r t e d c e l l s l o a d e d i n t h e c e n t e r, a n d
center-supported cells loaded at the ends. The end-loaded
cell is used in the Translink hanging-link truck scale module
d e s c ri b e d l a t e r i n t h i s s e c t i o n . T h e m o re c o m m o n
center-loaded version described below is used in the RL1600,
EZ Mount 1, and MVS mounting systems.
Figure 15-1 shows some important guidelines for applying load
to a center-loaded, double-ended shear beam and for orienting
a module using this type of load cell.
Figure 15-1.
General Mounting Principles
• The load cell should be horizontal in both directions.
• The load should be applied vertically through the
cell’s center.
• The load should be introduced without producing a
twisting effect around the center.
• The load must not move along the cell.
Double-End Beam Orientation
In Figure 15-2, we illustrate some recommended mounting
methods for double-ended shear beams used in the RL1600
and EZ Mount 1.
Figure 15-2.
15.2 RL1600 Modules
These assemblies are suitable for medium- to heavy-capacity
applications because of the inherent strength and stability of
the double-ended center-loaded cell which is supported at
both ends on pins. The modules are self-checking in all
directions while allowing some freedom for the vessel to
expand/contract in a single direction by sliding on the
mounting pins. The modules also offer lift-off protection to
prevent the tank from accidental tipping.
The RL1600 module is a rugged and economical module for
use where minimal expansion/contraction movement is
expected. Precise alignment is critical with these modules, as
there is little room for misalignment with the clamping yoke
that holds the load plate to the load cell. Load cell
replacement requires raising the vessel only an inch to remove
the cell.
The 1600 series modules are available in either fabricated mild
steel or cast iron, and in fabricated stainless steel where extra
corrosion protection is required.
Allowable Movement
Figure 15-3.
T hi s m o d ul e a ll o w s l im it ed mov e m en t i n a d irec t i o n
perpendicular to the longitudinal axis of the load cell.
Construction and Features
1. A rigid base plate with four cross-drilled uprights to
support the pins holding the load cell.
2. A chair clamps around the load cell’s center. This
arrangement allows the cell freedom to slide laterally
a short distance on the pins.
3. The module is self-checking in all directions.
4. It is available in mild steel and stainless steel
construction in capacities from 1,000lb to 75,000lb,
and in cast iron from 1,000lb to 25,000lb. It may be
used with RL75016 load cells in alloy steel or stainless
steel.