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Calculate the Spreader Constant Value
The Spreader Constant value can be calculated in one of two ways: by performing a mathematical
calculation,
or by performing a "catch test" by applying and measuring the product used.
Note: The Spreader Constant value must be recalculated every time the gate opening dimensions are
changed!
Formula Calculation:
First, use a tape measure to measure the following dimensions on the machine:
• Gate height (GH) in inches [cm]
• Gate width (GW) in inches [cm]
• Distance of travel (D) in inches [cm] of the belt per one revolution of the sensor
Second, determine the number of pulses emitted by the encoder per one revolution of the sensor.
1. Enter a METER CAL value of 10.
2. Enter a TOTAL VOL value of 0.
3. Turn the sensor exactly one revolution. The value in TOTAL VOLUME is the number of encoder pulses
per sensor revolution.
Third, determine the cubic feet [cm] of discharge per one revolution of the sensor by multiplying the
distance of the belt travel per one sensor revolution by the gate height by the gate width, then dividing
it by 1728 (not necessary for determining cubic cm).
For Example:
Distance of Belt Travel per 1 Sensor Revolution (D) = 13 inches [33 cm]
Gate Height (GH) = 3 inches [18 cm]
Gate Width (GW) = 8 inches [38 cm]
Number of Encoder Pulses per 1 Sensor Revolution (P) = 180 or 360 (Dependent on Encoder)
D x GH x GW = Cubic Feet of Discharge per 1 Sensor Revolution
1728
13 x 3 x 8 = .181 cubic feet of discharge per 1 sensor revolution
1728
Finally, calculate the Spreader Constant value using one of the following formulas, using the example of
a 180 CPR granular encoder. Write down this number for future reference when programming the
console.
Rate in Pounds:
*180 Encoder Used As Example*
P
Cubic Feet of Discharge per 1 Sensor Revolution
180
= Spreader Constant Value
= 994 Spreader Constant
36
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