OPERATOR’S MANUAL
Control Point
®
11001-1489-201702 Rev B
SYSTEM CALIBRATION / 79
GRANULAR MATERIALS CALIBRATION (F6)
The GRANULAR CALIBRATION determines the spreader constant (SPR
CON) for a given granular material. The spreader constant is the number of
pulses generated by the application rate sensor per pound of granular
material discharged. A separate calibration routine must be run for each
granular material used.
GRANULAR CALIBRATION (also referred to as a granular "catch test")
causes the control system to run the conveyor/auger mechanism,
dispensing material while the vehicle is stationary. When a sufficient amount
of material has been discharged, the operator stops the spreader
mechanism, weighs the material discharged, and keyboard enters the
amount. The system then calculates, stores, and displays the SPR CON.
The procedural steps are as follows:
1. Load the vehicle hopper with the desired material and verify the gate
height is adjusted to the proper setting on V-Box spreaders. If tailgate
spreads are in use, make sure auger is full. Load enough material to
provide a uniform flow throughout the calibration procedure.
2. Position a suitable container or drop cloth to catch all dispensed
material from the conveyor/auger. The container must be large enough
to obtain a good, representative sample. The larger the sample
weighed, the better the accuracy. Alternatively, if a vehicle scale is
available, weigh the truck before and after dispensing material.
3. Press Function key F6 to access the CALIBRATION MENU screen.
Press the 1 key to select GRANULAR CALIBRATION.
4. Select the granular material for calibration (keys 1 - 4). The words
ENABLED and DISABLED after the selected product have no
significance to the calibration. (Figure 48) illustrates the SALT
CALIBRATION selection. Other selections are equivalent.
A warning message displays STARTING THIS PROCEDURE WILL
CAUSE MATERIAL TO DISPENSE. Ensure all personnel are clear
before starting the next step.
IMPORTANT: If using a Gate Height Sensor, calibration must be
verified before the Spreader Calibration.
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