Rice Lake RL50210 User Manual

RL50210 TA/65059

Load Cell Mounting Kit

Installation

Guide

25713

Contents

1. Introduction ............................................................................. 1

2. Mechanical Installation........................................................... 2

2.1 Installation Guidelines for Compression Weighing Assemblies...2

2.2 Installing the RL50210 TA/65059 Mount .....................................3

3. Load Cell Wiring...................................................................... 6

4. Junction Box Connections, Adjustments & Calibration...... 6

5. Troubleshooting...................................................................... 7

6. Maintenance and Replacement Parts.................................... 8

7. Limited Warranty................................................................... 11

Printed in the United States of America.

Specifications subject to change without notice.

01/04

1. Introduction

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Typical Mounting Configuration

Rice Lake Weighing Systems’ 50210 TA/65059 Mini-Tank Weighing 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 also allows the vessel to expand/contract without restriction and provides a degree of shock protection.

The 50210TA/65059 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 500-2,500 lb., the units use single-ended shear-beam load cells and are available in zinc-plated steel or stainless steel. 1K-2.5K capacities can be fitted with RL35083 or RL35082 stainless steel, welded seal, IP67 load cell. This is a non-part numbered special. Consult factory for quote information.

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.

Authorized distributors and their employees can view or download this manual from the Rice Lake Weighing Systems distributor site at www.rlws.com.

2. 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 which 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 RL50210 TA/65059 compresses as load is applied, making the mount particularly suitable for applications involving minor 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, if welding on the mount 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.

Note: The arrow on the load cell should point in the direction of the load.

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