Hardy HI 6600 Series Modular Sensor System - Manual (Page 41)

HI 6600 Series Modular Sensor System User Guide
Page | 41
Hard Calibration
Hard Calibration is the method of calibration that uses test weights. We recommend that the span total 80 to 100% of the
scale live load capacity and the weights be distributed uniformly on/in the scale.
Put a load (weight) on the scale or vessel. For a full load test you can put 80% to 100% of the expected weight you will
see in your process on the scale or vessel.
1) Check to see if the weight reading changes on the display changes in the proper direction.
For example, if the display reads 100 pounds and a 20 pound load is placed on the vessel
or scale, the display should read 120 or some value over 100.
If the display reads 80 pounds after a 20 pound load is placed on the vessel or scale, the reading is going
in the wrong direction and indicates some problem with the system. (See Chapter on Troubleshooting
for corrective action)
If the display is reading improperly or shows no change there is something wrong with the
configuration wiring or the load cell.
2) If the display changes in the proper direction, remove the weight and proceed to calibrate
the Weight Processor.
Hard Cal Commands and Parameters
These commands and parameters are used when doing a Hard Cal or traditional calibration of the instrument.
Cal Lo Weight Parameter
The value you enter for Cal Lo Weight sets the lower weight value to be used when calibrating the system. The Cal Lo
weight value, is normally zero (no weight on the scale), but can be set to any known weight on the scale. With nothing
(zero) on the scale, the Cal Lo Weight is 0.00. With 5 lbs on the scale, the Cal Lo Weight is 5.00 lbs.
Cal Tolerance Parameter
The value you enter for Calibration Tolerance sets the amount of deviation the instrument will allow during the calibration
process. This value must be greater than or equal to the base motion value and/or the Graduation Sizes.
The base motion value can be calculated by using the following formula:
Base Motion value = (Total Load Cell Capacity x 0.0003)
RANGE: 000001 - 999999 (default 10)
Do Cal Lo Command
Before executing this Do Cal Lo command verify that the Cal Lo Weight value is correct.
After setting/verifying the Cal Lo Weight value executing this command will run the Hard Calibration
process using the Cal Lo Weight, Cal Tolerance and Sensitivity parameter settings.
Do Cal Hi Command
Before executing this Do Cal Hi command verify that the Span Weight value is correct. After