7/53
Constant walking speed
Uniform spray height
Wear appropriate protective clothing
Do not contaminate water
Spray downwind and avoid drift
Keep constant height
4.2. Calibration of manual knapsack sprayer
Using calibrator bottle (optional).
•
Hold the lance at the working height and spray to measure
the application band width.
•
Based on the band width, calculate the total walking dis-
tance required to spray the desired area. Use the chart below.
Band
width
Band width
(m)
0.5
0.7
1.0
1.2
1.5
Distance to
walk (m)
50.5
35.7
25.0
20.8
16.7
Attach the calibrator bottle to the lance as shown:
Lance
Cover
Filter
Nozzle
Nozzle cap
Calibrator
bottle
1.
Remove the cap, nozzle and filter.
2.
Mount the calibrator cover to the lance.
3.
Reinstall the filter, nozzle and cap.
4.
Screw the calibrator onto the cover.
Record the time it takes to
walk 25 m²
Simulate the spraying of 25 m²
•
Hold the lance at the normal working height and spray into
the bottle while walking the distance required to spray an
area corresponding to 25 m².
•
Place the bottle on a level surface and observe the liquid level
visible through the side of the bottle. Match the liquid level to
the corresponding scale on the calibrator bottle.
•
Empty the bottle and repeat this operation to determine the
average of two or more readings.
4.1b. Application
