4.11 Boom Sprayer Calibration (Use Clean Water)

 

Step 1. Check your tractor/sprayer speed

 

Formula:	MPH	=	ft traveled	X	60
			sec traveled		88

 

Your tractor sprayer speed:

 

MPH	ft traveled	X	60	=
	sec traveled		88

 

Step 2. Record the inputs

 

	Your figures	Example
Nozzle type on your sprayer (all nozzles must be identical)		110  04  flat fan
Recommended application volume (from manufacturer’s label)		20 GPA
Measured sprayer speed		4 mph
Nozzle spacing		20 inches

 

 

 

 

Step 3. Calculate the required nozzle output.

 

Formula:	GPM	=	GPA	X	mph	X	Nozzle spacing
			5940 (constant)

 

 

 

Your figures: GPM	=		X		X		=		=	GPM
		5940						5940

 

Step 4. Operate the sprayer

 

Set the correct pressure at the gauge using the pressure regulating valve.

 

Collect and measure the output of each nozzle for one minute.

 

The output of each nozzle should be the approximately the same as calculated in Step 3 above. Remember 128 fl. oz. in one gallon. If output has been calculated at 0.27 GPM then output is 128 multiplied by 0.27 = 34.5 fl. oz. in one minute.

 

Replace all nozzle tips that are more than 10% inaccurate.