OPERATOR’S MANUAL
Control Point
®
11001-1489-201702 Rev B
APPENDIX A CONVERTING CONSTANTS / 97
APPENDIX A CONVERTING CONSTANTS
FINE TUNING APPLICATION
Adjusting Granular Constants
If small (less than 10%) but consistent granular APR errors (either high or
low) are observed over a period of time, fine tuning of the system can be
performed by adjusting the value of the spreader constant by the same
percentage as follows:
EXAMPLE: If SPR CON is 100 and Target APR is 300 LBS?MILE but
Actual APR is known to be 315 LBS?MILE, adjust SPR CON using the
above formula:
NOTE: Keyboard enter the new SPR CON on the appropriate (Granular)
configuration screen.
Adjusting Liquid Constants
In a manner similar to that for granular (shown above,), liquid APR errors
can be corrected by fine tuning the flowmeter constant (K-FACTOR) as
follows:
EXAMPLE: If K-FACTOR is 1,000 and Target APR is 10 GAL?MILE, but
Actual APR is known to be 9.5 GAL/MILE, adjust K-FACTOR using the
above formula:
New SPR CON = Old SPR CON x
Target APR
Actual APR
New SPR CON = 100 x = 95.2
300
315
New K-FACTOR = Old K-FACTOR x
Target APR
Actual APR
New K-FACTOR = 1000 x = 1053
10
9.5
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