Fairbanks 9104 FB Omnicell - Manual (Page 16)

Section 3: Scale Installation
07/13 16 51325 Rev. 1
2. The load on each Omnicell should be roughly equal. This can be easily
checked by measuring the millivolt output signal or output counts from each
load cell assembly. Shim as required to equalize the load cell output
signals. For tank or hopper applications the signal output should be within
+/- 20% of the load on each Omnicell used in the installation.
3. Since the Omnicells have a maximum deflection of about 0.015 inches,
shimming or grout may be used to level the mount and is usually necessary
to equalize the load cell outputs. If shimming is a problem and the vessel
has alignment problems, neoprene rubber equalizing pads may be used on
the top of each Omnicell to help equalize the loading. The top and bottom
plates must be level within +/-0.5°.
4. The vessel should not touch or rub against supporting structures.
5. The filling or discharge piping should have flexible sections or be run in
parallel to the vessel for approximately 3-4 feet so the piping will be
decoupled from the vessel being weighed and not affect the weighing
accuracy.
6. For lower capacity systems, less than 5K lbs., the attachment of pipes and
feed chutes to the vessel is more critical in relation to weighing errors.
IMPORTANT: Load from vessel must be centered over the top plate.