CALIBRATION DISCLAIMER
© Trynex International 2010 Lxxxx
1 — 17
R
It is the responsibilty of the person using this equipment to make sure that every type of
material is properly calibrated to perform as expected. This process should take place on a solid
flat surface away from drains and livestock areas in order to achieve a safe and accurate reading
for proper material distribution. Failure to do so may cause an over/under application that could
damage turf areas or give an ineffective pest control treatment. Any calibration charts contained in
this manual are given as a refernce point only and should not be used as an absolute condition.
Spending a few extra minutes to properly calibrate will not only save on wasted materials and time
but also protect turf and other vegitation. Below are several points to be aware of before operating
your spreader in the field.
. Flow rates of chemicals can change for many reasons
1. Formualtions vary within the same brand or even between brannds
2. Formulations vary between batches or dates of manufacture
3. Humidy can cause the material to clump and flow poorly
4. Poor spreader maintenance can cause flow changes
5. Slide stop has moved or calibrated to another type of material
6. Human error can cause rate miscalculation
. Items needed for calibriation
1. A way to catch the material for weighing
2. A device to measure distance
3. A scale to weigh your product
4. A stop watch or other means to time
. Conversion
1. To convert pounds per 1000 square feet to pounds per acre, multiply your rate by 43.6
. Other important information
1. 1 acre is equal to 43,600 Squre Feet
2. Ground speed is very important to keep in mind when doing calculations, you will want
to convert mph to feet per minute
Set the spreader stop at mid point on it’s travel length as a starting point. Fill the hopper with enough
material to cover a known area of 1000 square feet. Open the gate and make note of the start/stop
time, this is very important. Next weigh the material on a scale, divide the weight by the known area
to establish an application rate. You may have to adjust the gate stop for more or less material
depending on your results.
