Cooper Instruments LTW652-1.5K Installation Manual

LTW 652

TANK WEIGHING LOAD CELL

USER’S GUIDE

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PH: 540-349-4746 • FAX: [phone]

CONTENTS

1.0 INTRODUCTION ....................................................................................................................3

2.0 MECHANICAL INSTALLATION ............................................................................................3

2.1 Installation Guidelines for Compression Weighing Assemblies................................................3

2.2 Installing the LTW 652 Mount ........................................................................................................4

3.0 LOAD CELL WIRING.............................................................................................................5

4.0 JUNCTION BOX CONNECTIONS, ADJUSTMENTS & CALIBRATION ...............................6

5.0 TROUBLESHOOTING ...........................................................................................................6

6.0 MAINTENANCE .....................................................................................................................7

7.0 WARRANTY REPAIR POLICY ............................................................................................10

CF 43 ii 10/6/00

1.0 INTRODUCTION

Cooper Instruments LTW 652 Mini-Tank Assemblies provide an easy-to-use, cost-effective, and reliable method for
low capacity weighing applications. They are ideal for installations where checking requirements are low. The
flexible neoprene mounting system allows for bolting the units directly to the mounting surface without extra plates
or load buttons. The neoprene pad allows the vessel to expand/contract without restriction and provides a degree
of shock protection.

The LTW 652 Mini-Tank Weighing Assemblies are available from 50-250 lb. Capacities in zinc-plated or stainless
steel versions using cantilever beam load cells. In capacities from 500-2500 lb., the units use single-ended shear­beam load cells and are available in zinc-plated steel or stainless steel.

CAUTION! The installation should be planned by a qualified structural engineer. Each installation is unique, and
this manual is meant to serve only as a general guideline for installation.

2.0 MECHANICAL INSTALLATION

2.1 Installation Guidelines for Compression Weighing Assemblies

1. The mounting surface for the base plate and top plate must be level. After installation, the top and bottom
plates must be level within ±0.5°. If the mounting surfaces are not level, then shims and/or grout may be used
to level the mount.

If possible, check that the mount is level when the vessel is fully loaded because excessive deflections in legs

and supporting structures may cause additional side forces that greatly affect accuracy. Deflection of the
mount’s top or base plate due to loading should not exceed ±0.5°. Reinforcement of legs or support structure
may be necessary to correct this. Vessels with long legs should have cross bracing applied between adjacent
legs to keep them from spreading under loads.

2. Compression mounting systems use three, four, or more mounts. More than eight mount systems should be
avoided as even weight distribution becomes extremely difficult to achieve. The load on each mount assembly
should vary no more than 20%. Add shims where necessary to achieve correct load distribution.

3. If the actual load cells are used during installation, extreme care must be taken to prevent overload damage. A
tank or hopper weighing several tons can exert huge forces when dropped only a fraction of an inch. Dummy
load cells can be used during installation.

4. The neoprene mount of the LTW 652 compresses as load is applied, making the mount particularly suitable for
applications involving shock loading. However, it is not recommended for vessels with attached piping because
the added downward deflection of the vessel as it is loaded makes it difficult to design a piping system with the
required degree of flexibility.

5. Load cells should not be installed in the mounts until all welding is completed. The heat generated by welding
current passing through a load cell can damage the adhesive holding the strain gauge to the body. If possible,
use a dummy load cell when welding to maintain finished height. If welding is unavoidable after load cell
installation, connect the ground in such a way that the current does not flow through the load cell. For example,