TeeJet 844 Sprayer Control - Manual (Page 41)

Example: If the volume displayed is 5% too high, then increase the flow
meter calibration number by 5%. If the volume displayed is 5% too low,
then decrease the flow meter calibration number by 5%.
Method 2 – Known Tip Size Method
Step 1 – Check Tip Size
Determine what size tip is on the sprayer. An actual flow collection should be
done on a representative sample to ensure the tips are not worn. To do this,
set the boom pressure at 40psi (2 bar). This must be pressure at the tips
(i.e. use manual pressure gauge mounted on the boom). Collect flow for 1
minute from 1 tip.
Example: XR8004 tip should spray 0.4 gallons in 1 minute (1.29 LPM) {0.32 Imp Gal}
Step 2 – Count Tips
Count the total number of tips to be used for measure. You can use 1 boom
section, 2 boom sections, etc.
Example: Boom Section 1 has 10 tips
Step 3 – Calculated Flow
Multiply the number of tips to be measured by the size (or individual flow rate)
of each tip.
Example: 10 tips x 0.4 GPM (1.29LPM) {0.32 Imp GPM} = 4GPM (12.9 LPM) {3.2 Imp GPM}
Step 4 – Measure
Turn controller on and activate pump. Toggle on the Master Boom Switch and the
number of boom sections to be measured. Insure that the pressure at the boom is
maintained at 40PSI (2bar). While spraying press and hold the key in. Look at the
lower right display to see if the measured flow matches the calculated flow.
Step 5 – Adjustments
If the measured flow does not match the calculated flow, the flow meter number
may need to be adjusted.
If the measured flow is higher than the calculated flow, the flow meter calibration
number needs to be increased.
If the measured flow is lower than the calculated flow, the flow meter calibration
number needs to be decreased.
Example: Calculated flow is 4.00 GPM (12.9 LPM)
{3.20 Imp GPM}; measured flow is 3.6 GPM
(11.6 LPM) {2.88 Imp GPM}
4.0 GPM - 3.6 GPM = 0.4 GPM
12.9 LPM - 11.6 LPM = 1.3 LPM
3.2 Imp GPM - 2.88 Imp GPM = 0.32 Imp GPM
Decrease the flow meter calibration number by 10%.
If original number was 650, enter 585 for this programming value.
39
Flow Meter Calibration
= 0.1 x 100 = 10%
0.4GPM
4.00GPM
= 0.1 x 100 = 10%
1.3LPM
12.9LPM
= 0.1 x 100 = 10%
0.32 Imp GPM
3.2 Imp GPM