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GRANULAR APPLICATIONS
CONSOLE CALIBRATION
1. CALCULATING "BOOM CAL"
For Gran 1 (single belt) applications, enter the total width of the spread pattern in inches [cm] as
BOOM CAL 1. For Gran 2 (split belt) or Gran 3 (dual encoder) applications, enter the left side spread
pattern as BOOM CAL 1 and right side spread pattern as BOOM CAL 2.
2. CALCULATING "SPREADER CONSTANT"
1) Find the cubic feet [Cubic cm] of discharge per 1 revolution of the sensor.
L = Length in inches [cm] of belt travel per 1 revolution of sensor
GH = Gate Height in inches [cm]
GW = Gate Width in inches [cm]
NOTE: For Gran 2 or Gran 3 applications, Gate Width is the total of both openings.
Cubic Feet [cubic cm] of Discharge per 1 revolution of sensor:
cu ft/rev. of sensor = L x GH x GW
1728
cu cm/rev. of sensor = L x GH x GW
EXAMPLE: 1) L = 13 inches [33 cm]
2) GH = 1 inch [3 cm]
3) GW = 44.8 inches [114 cm]
cu ft/rev. of sensor = 13" x 1" x 44.8" = .337
1728
cu cm/rev. of sensor = 33 x 3 x 114 = 11,286
2) For RATE displayed in 1 lb increments:
Spreader Constant (1 lb) = counts per rev of sensor
cu ft/rev. of sensor
EXAMPLE: For 360 counts per rev, Spreader Constant = 360 = 1068
.337
For RATE displayed in 1 kg increments
Spreader Constant (1 kg) =
counts per 1 rev of sensor x 100,000
cu cm / rev of sensor
EXAMPLE: For 360 counts per rev, Spreader Constant = 360 x 100,000 = 3190
11,286
NOTE: Counts per 1 rev of sensor may be determined by entering a METER CAL number of 10,
SPREADER CONSTANT of 0, and TOTAL VOLUME of 0 and turning sensor exactly 1
revolution. The number in TOTAL VOLUME will be the counts per 1 rev of sensor.
NOTE: Flowability of product will affect actual results. Spreader Constant should be verfied by
performing Spreader Constant Calibration Procedure in Appendix 7 before field application.
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