Hardi ES 50, Operator'S Manual

Page: 20 / 48

18
HARDI
®
GAS ENGINE ESTATE SPRAYER OPERATOR’S MANUAL
6.0 CALIBRATION
WARNING: ALWAYS CALIBRATE YOUR SPRAYER WITH CLEAN
WATER ONLY! WEAR PROTECTIVE CLOTHING SUCH AS RUB-
BER GLOVES, GOGGLES AND COVERALLS.
Why mu s t you calibrate a s prayer?
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 large error in application rate.
How do you calibrate a s prayer?
Calibration kits are available from HARDI ® , #818493 for U.S. Gallons
and #818492 for metric calibration. For accurate calibration, the
sprayer is driven a specific distance at spraying speed and the length
of time is recorded. The operator then measures the amount of water
sprayed from one nozzle at spraying pressure for the same length of
time noted. The amount of water sprayed provides a direct reading of
application rate. Slight adjustments are then made by varying the
pressure.
Here are some tips to remember when using the calibration kit method:
1. Calibrate with clean water only.
2. Follow the instructions in the calibration kit carefully.
3. Before calibration, check the flow of each nozzle. If it puts out more
than 10% of its original volume, replace it.
4. When determining the length of time required to drive a recom-
mended distance, drive in actual field or lawn conditions with a half full
sprayer. Repeat the test several times, then take the average of the
times recorded.
5. Calibration of the sprayer should be completed at the beginning of
the season and repeated every 2 to 3 full days of spraying, and every
time you change volume rate or use different nozzles.
NOTE: A Calibration & Nozzles Manual (HARDI ® ref. no. 67000103) is
available from your HARDI ® dealer which contains more detailed
information for calibration and nozzle selection.