Teejet 844 Sprayer Control User Manual download pdf (Page 40)

Flow Meter Calibration

The flow meter supplied with your system has been calibrated at the factory and

under normal circumstances there may be no need to re-calibrate it. However,

the factory calibration setup may not reflect specific sprayer plumbing. Before

spraying actual chemicals, the flow meter should be checked for proper

calibration. Also, the flow meter is made up of moving parts and can wear over

time. If you feel that your flow meter is worn, you can re-calibrate your flow meter

using the 844 console. To do so, use either of the following methods:

Method 1 – Known Volume

Step 1 – Known Value

Select a known volume of water (n) that you will pump through the flow meter. In

these steps, 10 US gallons (38 liters) {8 Imperial gallons} will be used as an

example. The specific volume you use is not important, although larger volumes

generally produce more accurate results.

Step 2 – Programming Calibration Number

Go into the System Setup mode and advance to the flow meter calibration number

step (flashing turbine at the top of the display). In this programming step, enter (n)

10 US gallons (38 liters) {8 Imperial gallons} as the calibration number. Exit the

System Setup mode by depressing and holding the key for five seconds.

Step 3 – Resetting Volume Counter

Reset the total volume number that is displayed in the lower right portion of the

display. (Display alternates between Ac (Ha) covered and the volume sprayed through

the flow meter). To reset this number, press and hold the and keys

simultaneously for three seconds or until you see the values reset to zero.

Step 4 – Spraying Known Volume

Engage the pump on the sprayer, flip the Master boom section of the 844 to “ON”

(make sure at least one boom section switch is on), and pump exactly (n) 10 US

gallons (38 liters) {8 Imperial gallons} through the flow meter. When the known

volume is reached, shut the Master boom switch “OFF”.

Step 5 – Entering in New Flow meter Calibration Number

The number that is displayed in the lower right corner of the display is your new

flow meter calibration number. Record this number, enter the System Setup

mode and advance to the flow meter calibration number step. Enter the new

value from your test into this step and then exit the System Setup mode.

Step 6 – Double-checking the New Value

Double-check your new value by spraying a larger volume of water, such as

100 US gallons (378 liters) {83 Imperial gallons} through the flow meter. Before

spraying the larger volume, make sure to reset the memory counters by

depressing and holding the and keys simultaneously for three seconds.

NOTE: After double checking the new calibration number, if you find that

the volume shown on the display of the 844 is more than +/- 3% in error,

change the flow meter calibration number in the System Setup mode by

the % difference it is in error.

1 2 ... 35 36 37 38 39 40 41 42 43 44

Comments to this Manuals

No comments

Teejet 844 Sprayer Control User Manual Page 40

Comments to this Manuals

Related products and manuals for Computers Teejet 844 Sprayer Control