Hardy HI 1769-FC - Manual (Page 50)

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Chapter 5
Chapter 5 Calibration
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The Feeder Controller Module should be calibrated before use. We also recommend that
you verify the calibration periodically or when not in use for extended periods of time.
Users and service personnel should be familiar with the procedures in this chapter before
installing or operating the Feeder Controller Module.
NOTE Do not perform a calibration while the application is in operation.
Pre-Calibration Procedures
Verify that the load cells have been properly installed.
 Refer to your load cell I&M manual for proper installation instructions.
 On some sensors and cells an arrow indicates the direction of the applied load. If
the arrow is pointing in the wrong direction, change the position of the load cell
so that it is mounted in the direction of the applied load.
 Check for binding on the Load Cell or other parts of the weighing system.
CAUTION: Binding on a scale/vessel or load cell does not allow the load cell free vertical movement
and may prevent the instrument from returning to the original zero reference point.
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.
Properly Installed Load Cell
Electrical Check Procedures
Load Cell/Point Input/Output Measurements
The Feeder Controller Module is designed to supply 5 VDC excitation to as many as four
350-Ohm load cells/points. 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
system’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