Cooper Instruments LTW650-1.5K Installation Manual

LTW 650

WEIGH MODULE KIT

USER’S GUIDE

www.cooperinstruments.com

PH: 540-349-4746 • FAX : [phone]

CONTENTS

1.0 INTRODUCTION ....................................................................................................................1

2.0 MECHANICAL INSTALLATION ............................................................................................1

2.1 General Installation Guidelines for Weigh Modules ....................................................................1

2.2 Installing the LTW 650 ....................................................................................................................2

3.0 LOAD CELL WIRING.............................................................................................................3

4.0 JUNCTION BOX CONNECTIONS, ADJUSTMENTS & CALIBRATION ...............................4

5.0 TROUBLESHOOTING ...........................................................................................................4

6.0 MAINTENANCE AND REPLACEMENT PARTS ...................................................................5

7.0 WARRANTY REPAIR POLICY ..............................................................................................7

CF24 ii 05/29/01 (V-6/99)

1.0 INTRODUCTION

The LTW 650 Weigh module kit provides an extremely accurate
method for weighing medium and large capacity tanks, hoppers, bins,
and reactors. The design uses a double-ended shear beam load cell
and transmits the load through a clamping load plate to the center of
the load cell. This design is very effective in providing for thermal

Thermal

Expansion

expansion/confrontation with little friction.

In the majority of applications, the modules are self-checking and held
captive with no need for check or stay rods, making this mount a good
choice for areas with frequent seismic activity.

The LTW 650 is available in cast iron, mild steel, or stainless steel in sizes from 1,000-75,000 lb.

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 General Installation Guidelines for Weigh Modules

1. The mounting surface for the base 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 module 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 ±.5°. Reinforcement of legs or other support
structures may be necessary to correct this. Vessels with long legs should have cross bracing applied between
adjacent legs to keep them from spreading under load.

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

3. If the actual load cells are used during installation of the weigh
module, 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. It is crucial that all piping or conduit be horizontal and flexible. If
flexible piping is not used, make sure the distance from the vessel
to the first pipe support is 20-30 times the pipe diameter. In
smaller, lower capacity tanks and hoppers, isolating the resultant
forces becomes extremely critical.

LEVEL
+/- 0.5

FLEXIBLE PIPING

J-BOX

5. Load cells should not be installed in the modules until all welding is completed. The heat generated from
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, if welding on the module top plate, the ground must be connected to the vessel, not to the mount
base or support structure. Also, protect the load cell and cable from weld splatter.

6. When possible, use only “hermetically sealed” load cells in washdown applications. Environmentally protected”
load cells are not suitable for such applications and will be damaged. If tanks and surrounding equipment are

CF24 1 05/29/01 (V-6/99)