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Successful Farming Sprayer Calibration Project
Robert E. Wolf
Associate Professor - Extension Specialist Application Technology
Bio & Ag Engineering
Kansas State University
Biological and Agricultural Engineering
Calibration!!!!
Ensuring that the spray output is what it is supposed to be!
Calibration/Nozzle Selection:
• What is the first step?• Use label to select the
– application volume– product rate
• Choose an appropriate travel speed - MPH
• Effective width of application– nozzle spacing
• Calculate GPM – Flow rate per nozzle
• Select the correct size of nozzle!
Page 9 – Turbo Flat-fan
Page 12 – XR Fat-fan
Page 15 – AI Flat-fan
Nozzle Selection Chart:Nozzle Selection Chart:
Checking for accuracy
• Check several new nozzles– flow rate within 5-7% of desired output?
• Check flow rate frequently– adjust pressure to compensate for small
changes output due to wear
• Replace nozzles & recalibrate when:– output > 7% change from new nozzle– when pattern becomes uneven
Nozzle types tested: Spraying Systems/TeeJet - newly purchasedXR11003, TT11003, AI11003, TTJ11003, and TTI11003XR= conventional, TT = chamber, AI = venturi (air induction), TTJ = double outlet chamber, and TTI = chamber and venturi in combo
Raven 440 Controller: 40 PSI - 10 GPA - 8.9 MPH (radar measured)Distance traveled during test = 726 linear feetTime to travel 726 feet = 56 sec (converts to 8.9 MPH – matches radar)Area sprayed during the test = 1 acre (726 * 60/43,560)Nozzle flow rate – chart standard for 03 orifice = 0.3 gpm at 40 PSI
0.3 gpm converts to 38.4 ounces/min = 0.64 ounces/secondExpected output in test travel time (56s) = 35.8 oz/min/nozzle (0.64 *
56)Suggested error standard (TeeJet) of + or – 5 to 7% from expected
flowWe used + or – 7% as our allowable from expected output
35.8 * .07 = 2.5 ounces35.8 – 2.5 = 33.3 ounces for lower end limit35.8 + 2.5 = 38.3 ounces for higher end limit
Test Parameters
Male Catheter Rubber placed over nozzle cap for each collection. Served as the air inlet plug for AI and TTI plugged test in rep 5.
XR
TTTTJ
AI
TTI
Surgical hose on AI
Rate Controller Output - 10 GPA Expected
8.5
9
9.5
10
10.5
Stationary on-the-go on-the-go on-the-go plugged
Collection Method
GP
A
37 nozzles – 4 types (9), 10 GPA, 8.9 MPH, 40 PSI
XR 11003 - Reps Averaged
35.6
37.1
35.8
30
31
32
33
34
35
36
37
38
39
40
Ou
nce
s
stationary bag average expected
red lines = + or - 7% from expected
XR 11003
35.6
36.6
37.4 37.3
35.8
30.031.032.0
33.034.035.036.037.0
38.039.040.0
stationary bag-1 bag-2 bag-3 expected
Collection Method
Ou
nce
s
red lines = + or - 7% from expected
TT 11003 - Reps Averaged
31.7
34.3
33.3
35.8
30
31
32
33
34
35
36
37
38
39
40
Ou
nce
s
stationary bag average bag-venturi plug expected
red lines = + or - 7% from expected
TT 11003
34.3
33.1 33.4 33.4
31.7
35.8
30.031.032.0
33.034.035.036.037.0
38.039.040.0
stationary bag-1 bag-2 bag-3 bag-venturi plug expected
Collection Method
Ou
nce
sred lines = + or - 7% from expected
AI 11003 - Reps Averaged
34.733.9
37.9 35.8
30
31
32
33
34
35
36
37
38
39
40
Ou
nce
s
stationary bag average bag-venturi plug expected
red lines = + or - 7% from expected
Air Induction - AI 11003
34.733.8 33.9 33.9
37.9
35.8
30.031.032.0
33.034.035.036.037.0
38.039.040.0
stationary bag-1 bag-2 bag-3 bag-venturi plug expected
Collection Method
Ou
nce
sred lines = + or - 7% from expected
TTJ 11003 Reps Averaged
33.7
31.9
34.1
35.8
30
31
32
33
34
35
36
37
38
39
40
Ou
nce
s
stationary bag average bag-venturi plug expected
red lines = + or - 7% from expected
TTJ 11003
34.133.4 33.8 33.9
31.9
35.8
30.031.032.0
33.034.035.036.037.0
38.039.040.0
stationary bag-1 bag-2 bag-3 bag-venturi plug expected
Collection Method
On
ces
red lines = + or - 7% from expected
TTI 11003
36.835.8
36.2
30.031.032.0
33.034.035.036.037.0
38.039.040.0
stationary bag-venturi plug expected
Collection Method
Ou
nce
s
red lines = + or - 7% from expected
37 nozzles – 4 types (9), 35.8 oz. expected, + or - 7% error
10 GPA, 8.9 MPH, 40 PSI
Rep Average for Nozzle Location on Boom
30.0
31.032.0
33.034.0
35.0
36.037.0
38.039.0
40.0
AI
XR AI
TT
J
AI
TT
J
XR TT
TT
TT
J
XR
XR AI
TT
J
AI
TT
XR AI
XR
TT
J
TT
TT
TT AI
XR TT
TT
XR
TT
J
TT
J
TT AI
TT
J
AI
TT
J
XR
TT
J
Boom Locatiion
Ou
nce
s
Summary by Nozzle Type - Reps Averaged
30.031.032.033.034.035.036.037.038.039.040.0
XR TT AI TTJ TTI
Ou
nce
s
stationary bag average bag venturi plug expected
red lines = + or - 7% from expected
•37 nozzles – 4 types (9), 35.8 oz. expected, + or - 7% error•10 GPA, 8.9 MPH, 40 PSI
Calibration!!!!The next phase!
Ensuring that the spray droplet spectrum is what it is supposed to be to maximize
efficacy while minimizing drift!
ASABE S-572 Droplet Size Standard
See Page 182, TeeJet Catalog 50
Droplet Selection/Calibration:
p. 15
Disclaimer:
• Brand names appearing in this presentation are for identification and illustration purposes only.
• No endorsement is intended, nor is criticism implied of similar products not mentioned.
