Hardy HI 1756-nDF - Manual (Page 62)

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Chapter 6
Erratic Flow Rates
This section explains how to resolve problems relating to Flow Rate (FR) and weight
calibration.
Flow Rate calculations
1. Verify the scale calibration using test weights. A poor weight calibration will
produce poor rate calculations.
2. Follow the weight troubleshooting flow charts and correct any equipment
binding, rubbing, and piping problems.
3. If the flow rate displayed does not match your test samples:
Re-calibrate the scale
Review the troubleshooting tips for mechanical influences relating to the
feeder mechanism
Look for leaks in the delivery system or refill gate.
4. If the system is slow to change the flow rate (or weight) readings.
Adjust the number of averages setting lower.
Adjust the WAVERSAVER setting lower.
5. Look for a systematic and consistent change in weight. Determine what a stable
rate should be. If the flow rate displayed on the monitor continuously falls and
rises and you never get a stable rate or symmetrical change in weight pattern:
The rate may be too slow for the load cell capacity.
The material may be bridging or liquefying and basically inconsistent.
The feeder motor may be feeding too fast, mechanisms may be damaged, or
working conditions may not be right.
System and Load Cell Tests
Overview of Typical Load Cell System
The typical load cell system consists of one or more load cells/points and an HI 1756
nDF Dispenser-Filler. If you have more than one load point, an optional IT summing
junction box can read data for individual load cells.
Load Cell/Sensor/Point - is a strain gauge-based force transducer that generates an
electrical signal proportional to the load applied to the scale. Tension or compression type
load cells/points can be used to measure pressure, load, or torque.