Hardy HI 6600 Series Modular Sensor System - Manual (Page 37)

HI 6600 Series Modular Sensor System User Guide
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NOTE:
The operating range for the scale in this example is 5-10 mVDC with a 500 pound weight range. After
zeroing the instrument, the 0 reading refers to the zero reference point and not absolute 0 mVDC or absolute 0
weight.
NOTE: Load cell/point measurements are checked with a digital voltmeter at the load cell connector
on the front of the module or by using INTEGRATED TECHNICIAN with a Hardy IT Junction
Box. The scale calibration must be completed to enable IT to function correctly.
Load Check
Place a load (weight) on the scale or vessel, and check to see if the weight reading on the input table changes in the proper
direction.
For example, if the display reads 100 pounds and a 20-pound weight is placed on the vessel or scale, the display should
read 120 or some value over 100. With the display reading 100 pounds, if a 20-pound load is placed on the vessel or scale
and the reading is 80 pounds, the reading is going in the wrong direction and indicates some problem with the system.
If the display reads improperly or shows no change, something is wrong with the setup. If the display changes weight in
the proper direction, remove the weight and proceed to calibrate the instrument. Refer to Chapter 9 on troubleshooting for
additional help to determine the cause of the poor weight reading.
C2 & eCAL Electronic Calibration
C2 (also known as eCAL) Electronic Calibration, calibrates a scale system electronically without using certified test
weights. Digital information within a Hardy C2 or eCAL- certified load sensor details its unique performance
characteristics. The HI 6600 series instrument reads the performance characteristics of each load sensor and detects the
number of load sensors in the system.
Before running C2or eCAL calibration, run all of the pre-calibration procedures. Make sure you have configured the HI
6600 series instrument. This includes setting the units, decimal point, NumAverages etc. For instructions on setting up
your instrument, please see the Chapter on Instrument Configuration.
NOTE: Ensure the Sensitivity, Reference Weight and Gravity Correction are all set prior to running C2 cal
command.
C2 and eCAL Calibration Commands and Parameters
Sensitivity Parameter
The load cell sensitivity, defined in mV/V, sets the expected change in analog signal over the full scale range of an analog
strain gage load cell. For example if a 5 Volt excitation is applied to a load cell with a sensitivity of 2 mV/V then the full
scale signal will be 10mV. To ensure that the HI 6600 optimizes the processing of the analog signal from the load cell, the
load sensitivity parameter should be set to match that of the load cells being used.
Ref Weight Parameter
Reference Weight is the total live load that is currently on the scale. The calibration process uses a reference weight,
which is normally zero (no weight on the scale), but can be any known weight on the scale. With nothing on the scale, the
Reference Weight is 0.00. With 5 lbs on the scale, the Reference Weight is 5.00 lbs.