Actual APR
315
OPERATOR’S MANUAL
APPENDIX B 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:
New SPR CON = Old SPR CON x
Target APR
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:
New SPR CON = 100 x
300
= 95.2
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:
New K-FACTOR = Old K-FACTOR x
Target APR
Actual APR
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 K-FACTOR = 1000 x
10
9.5
= 1053
Flex4 Pro
TM
Control System
6010541 Rev A
APPENDIX B CONVERTING CONSTANTS / 145
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