47HARDI
®
N-SERIES 3-PT SPRAYER DIAPHRAGM OPERATOR'S MANUAL
5.5 Calibration (Pasture sprayer model only)
WARNING: ALWAYS CALIBRATE YOUR SPRAYER WITH CLEAN
WATER ONLY! IN ADDITION, WEAR PROTECTIVE
CLOTHING WHEN CALIBRATING YOUR SPRAYER!
Why must you calibrate a sprayer?
A nozzle selection chart will tell you what application rate you should
expect. Variations due to nozzle wear, errors in pressure adjustment,
and tractor speedometer can result in a possible error in application
rate.
How do you calibrate a sprayer?
Calibration kits are available from HARDI
®
, #818493 for US gallons &
#818492 for metric calibration.
Following are some tips to remember when using the calibration kit
method:
• When determining the length of time required to drive the recom-
mended distance, drive in actual fi eld conditions with a half-full tank.
• Repeat the test several times, each time avoiding the tracks from the
previous test. Take the average of the times recorded.
• Calibration of the sprayer should be completed at the beginning of
the season and repeated after every 2 to 3 full days of spraying, and
every time you change volume rate or use new nozzles.
• Before you calibrate, check the fl ow of each nozzle. If it puts out more
than 10% of its original volume, replace it.
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