Hardy HI 6500 Series - Manual (Page 125)

Calibration 115
•
•
•
•
•
•
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.
Step 1. 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.
Step 2. Check to see if the weight reading changes on the display 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 over100.
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 cells.
Step 3. If the display changes in the proper direction, remove the weight and proceed to
calibrate the Weight Processor.
Hard Calibration from the Web page
Step 1. Hard Calibration requires a zero point and the physical placement of test
weights on the scale. To set the Zero Value, if all “live load” weight is
removed from the Scale, the Zero Value should be 0.00. If any product weight
is on the scale when setting this value, the reference weight must be equal to
the amount of load on the scale.

Step 2. Wait 12 seconds or more for the scale to stabilize. Turn off as much vibration and
production equipment as possible to achieve the best calibration.
Step 3. Click in the Ref Weight text field and enter the reference weight you want to use.