Rice Lake RL50210 TA, 50-500 lb. Capacities Mild Steel - Manual (Page 4)

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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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