Hardy HI 1756-nDF - Manual (Page 47)

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Chapter 5
Chapter 5 Calibration
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The Dispenser-Filler 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 Dispenser-Filler Module.
NOTE Do not perform a calibration on either channel while an application is in
operation.
Pre-Calibration Procedures
Verify that the load cells have been properly installed.
Refer to your load cell operations and installation 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 Dispenser-Filler Module 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.