14
5. CALCULATING "SPREADER CONSTANT" (Granular Appli-
cations)
1) For RATE displayed in 1 lb [1 kg] increments:
L = Length in inches [centimeters], of belt travel per 1 revolution of Sensor
GH = Gate Height in inches [centimeters]
GW = Gate Width in inches [centimeters]
CPR = Counts per 1 revolution of sensor
English (US) : Metric (SI):
Spreader Constant =
CPR x 1728 Spreader Constant = [CPR x 100,000]
(1 lb) L x GH x GW (1 kg) [L] x [GH] x [GW]
EXAMPLE: 1) L = 13 inches [33 cm]
2) GH = 7 inches [18 cm]
3) GW = 15 inches [38 cm]
4) CPR = 180
English (US):
Spreader Constant (1 lb) = 180 x 1728
13 x 7 x 15
= 311,140 = 228
1365
Metric (SI):
Spreader Constant (1 kg) = [180 x 100,000]
[33] x [18] x [38]
= [18,000,000] = [797]
[22,572]
Counts per one revolution of sensor (CPR) may be determined by entering a METER CAL of 10, enter 0
in TOTAL VOLUME and turning sensor exactly one revolution. The number in TOTAL VOLUME will be the
CPR. This calculation can be performed while determining length of belt travel per one revolution of sensor
(L).
NOTE: Verify Spreader Constant by performing Spreader Constant calibration proce-
dure in Appendix 9 before field application.
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