Hardy HI 6500 Series - Manual (Page 120)

110 Chapter 6
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A load cell must be mounted so that
100% of the load (Vessel w/Contents)
passes vertically through the load cell.
Verify that nothing is binding the load
cell. This means that nothing is draped
across the scale/vessel or the load cell,
such as a hose, electrical cord, tubes, or
other objects. Verify that nothing is in
contact with the scale/vessel other than
service wires and piping that have been
properly mounted with flexible
connections. Flexible pipes are not to be
used in any other than the horizontal
plane and are not to be used to correct
pipe alignment problems. Vertical or at
angles other than vertical will have an
affect on the scales ability to repeat and
provide accurate weight readings.
Electrical Check Procedures
Load Cell/Point Input/Output Measurements
The HI 6500 series
instrument is designed
to supply 5 VDC
excitation to as many
as four 350-Ohm load
cells/points per
channel. The expected
output from each load
cell/point will depend
on the mV/V rating of
the load cell/point and
the weight.
For example, a 2mV/V
load cell/point will
respond with a
maximum of 10 mVDC at the load sensor’s full weight capacity, which includes the weight
of the vessel and the weight of the product as measured by the load cell/point. Thus, if the
load cell/point weight capacity is rated at 1000 pounds, the load cell/point will be 10 mVDC
at 1000 pounds, 7.5 mVDC at 750 pounds, 5 mVDC at 500 pounds and so on.