Kistler-Morse KM LD3xi Load Cell - Manual (Page 19)

Chapter 3. LD3xi/LD3xiC Mounting
3-5
Leveling and Shimming
Leveling/Shimming for the Universal Top Adapter Plate
1. Based on the Weight Distribution Chart (Figure 3-3) and
visual inspection, raise the vessel and cut/place shims
as required to adjust the distribution of weight on the
Load Discs. Begin with the “lowest output”
support first! (Objects and support members may cause
the weight to be distributed unevenly. Shimming will
involve some judgement.)
2. Gently lower the vessel and measure the dead weight
output and the output change of all of the Load Discs
to see how they are affected. Record again into the
Weight Distribution Chart on page 3-3.
3. Repeat Steps 1 and 2 until you have achieved the
desired output change of all of the Load Discs.
(Since the output of each load cell may vary, the change
from ‘no load’ to ‘dead weight’ being equal is more
important than the absolute value. )
Note: For installations where
leveling nuts are not used, load
balancing on the Load Discs
must be achieved by adding or
removing shims. Adjusting the
Load Discs to distribute the
vessel weight evenly may
require adding shims (supplied
by customer) systematically to
all disc locations.
The main objective of leveling/shimming the vessel is to distribute
the weight evenly on all of the Load Discs. Uneven weight distribu-
tion will reduce the accuracy of the weight measurement system as a
whole and in extreme cases may cause Load Disc damage.
Once the general instructions have been completed (page 3-2
through 3-4), begin the leveling and shimming instructions in this
section.
Note: The Universal Top Plate
will accomodate angular
misalignment up to three
degrees maximum. (Figure 3-5 )
Ideally, the load is distributed
evenly across the top plate.
Figure 3-5: Angular misalignment up to 3 degrees.
Note: Shims are typically
applied between the LD3xi’s
Top Plate and mating vessel
plate, but the gap condition
may exist at either the top or
bottom plates.
Note: Shimming the plates of
one Load Disc will probably
affect the weight distribution on
the Load Disc located on the
opposite side. Keep this in mind
while shimming.
CAUTION: If you
need to raise the
vessel or one vessel
leg after installation,
loosen the bolts on all
Load Discs to prevent
overloading.