Rice Lake Z6 Single-Ended Beam, SS Welded-seal, IP67, OIML C3 - Manual (Page 25)

Weigh Modules: Single-Ended Beam 21
14.0 Weigh Modules: Single-Ended Beam
14.1 Introduction
Single-ended beam load cells offer many advantages when
used in well-designed weigh modules. Modules using
single-ended beam load cells have a low profile, and are
generally self-checking. Load cell replacement is possible in
most single-ended beam mount systems by raising the vessel
only enough to remove pressure from the cell.
14.2 General Mounting Principles
• The mounting surface should be flat and level.
• The mounting block should be thick enough to
provide adequate threads for the mounting screws.
• The corner of the mounting surface (where the cell
cantilevers out) must be hardened to prevent
peening.
• The mounting bolts should be at least grade five to
prevent stretching or the possibility of breaking.
• The load should be applied vertically through the
center line of the load hole (the load may be applied
from above, as illustrated in Figure 14-1, or may be
hung from below).
• The load introduction must provide flexibility to avoid
the transmission of extraneous forces and to tolerate
the unavoidable deflection of the load cell itself.
• The mounting bolts should be torqued to specified
values.
Figure 14-1.
14.3 Single-End Beam Orientation
Figure 14-2 illustrates four different vessels and recommended
mounting configurations for single-ended beam weigh modules.
See the Section 14.9 on page 25 for special movement
considerations that apply to this unique single-ended beam
system.
The vessels in the upper row, at right, illustrate a vertical
cylindrical vessel. Note that the longitudinal axis through each
load cell points towards the center of the vessel.
This principle could also be used for the vessels in the lower
row, if it were convenient to mount the cells in each corner
with the longitudinal axis pointing toward the center. However,
it may be more convenient, and is acceptable, to mount the
cells as illustrated. As these cells are relatively immune to
extraneous forces applied along the longitudinal axis of the
cell, it should point in the direction of any prevalent side force
(for example, on a roller conveyor, the load cells should point
in the direction of travel).
Figure 14-2.
14.4 SURVIVOR ® 1700HE Modules
These light- to- medium capacity modules use single-ended
beam load cells in capacities from 5kg-250kg (11-550lb) and
500-5,000kg (1,100-11,00lb). The SURVIVOR 1700HE is
ideally suited for light- to- medium capacity micro-ingredient
batching and mixing in a variety of hostile environments,
especially where moisture is present. This module provides
superior corrosion resistance, moisture ingress and mechanical
protection. The load cells are waterproof guaranteed and OIML
C3 certified (20kg-5,000kg) to offer the ultimate in durability and
accuracy.
Allowable Movement
Figure 14-3 illustrates the 1700HE module’s capability to handle
movement. The load may be checked in one of two directions.
This allows positioning in one of two orientations for proper
checking.
Figure 14-3. SURVIVOR 1700HE