Rice Lake SURVIVOR 1700HE Weigh Module Kit - Manual (Page 7)

Mechanical Installation 3
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 instal-
lation, the top and bottom plates must be level within ±0.5°. If the mounting sur-
faces 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 affect accuracy. Deflection of the mount’s top or base plate due to
loading should not exceed ±.5°. Reinforcement of legs or support structure may
be necessary. Vessels with long legs should have cross bracing applied between
adjacent legs to keep them from spreading under loads.
2. Compression mounting systems use 3, 4, or more mounts. More than eight mount
systems should be avoided as even weight distribution becomes extremely diffi-
cult to achieve. The load on each mount assembly should vary by no more than
20%. During installation, add shims where necessary to achieve correct load dis-
tribution.
3. If the actual load cells are used during installation of the weighing assembly,
extreme care must be taken to prevent overload damage. A tank or hopper weigh-
ing several tons can exert huge forces when dropped only a fraction of an inch.
The 1700HE series weigh modules incorporate a unique jacking bolt assembly
that should be used to remove the load from the cells during installation.
4. It is crucial that all piping or conduit
be horizontal and flexible. If flexible
piping is not used, make sure the dis-
tance from the vessel to the first pipe
support is 20-30 times the pipe diam-
eter. For details, see our Weigh Mod-
ules & Vessel Weighing Systems
manual, PN 43918. In smaller, lower
capacity tanks and hoppers, isolating
the resultant forces becomes
extremely critical.
5. Load cells should not be installed in
the mounts until all welding is com-
pleted. The heat generated by welding current passing through a load cell can
damage the adhesive holding the strain gauge to the body. If possible, remove the
load cell when welding using the jacking/shipping bolts to maintain final 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.
The arrow on the load cell should point in the direction of the load.
6. All support points should be equally stiff so that they deflect by the same amount
as the vessel is loaded.
LEVEL - 0.5
FLEXIBLE PIPING
J-BOX
Note