Specifications

Chapter 1: Introduction
Compression Weigh Modules
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Introduction
This handbook is intended as a guide to selecting and applying METTLER TOLEDO
weigh modules for process weighing applications. It provides the scientific data and
accepted guidelines needed to help you design an accurate, reliable weighing system.
A weigh module is a weighing device that consists of a load cell and the mounting
hardware needed to attach the load cell to a tank, hopper, or other vessel. Typically,
three or four weigh modules are attached to a tank so that they support the full weight of
the tank. This effectively converts the tank into a scale. A weigh module system must be
able to (1) provide accurate weight data and (2) support the tank safely.
There are two basic types of weigh modules: compression and tension.
Compression Weigh
Modules
Compression weigh modules fit most weighing applications. These modules can be
attached directly to the floor, piers, or structural beams. The tank or other structure is
mounted on top of the weigh modules.
A typical compression weigh module is shown in Figure 1-1. It consists of a load cell, a
top plate (which receives the load), a load pin (which transfers the load from the top
plate to the load cell), and a base plate (which is bolted to the floor or other support
surface). A hold-down bolt is used to prevent the vessel from tipping.
Base Plate
Top Plate
Load Cell
Hold-Down Bolt
Load Pin
Figure 1-1: Compression Weigh Module