TeeJet 844-R Speed Compensated Application Control - Manual (Page 19)

98-05047 19
R0
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. To do so, use either of the following methods:
M
ETHOD
1 – K
NOWN
V
OLUME
Step 1 – Known Value
Select a known volume of water (n) to be pumped through the flow meter. In
these steps, 10 US gallons {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 step
(flashing turbine at the top of the display). In this programming step, enter (n) 10
US gallons {8 Imperial gallons} as the calibration number. Exit the System Setup
mode by pressing 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 covered and the volume sprayed through
the flow meter). To reset this number, press 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-R to
“ON” (make sure at least one boom section switch is on), and pump exactly (n)
10 US gallons {83 Imperial gallons} through the flow meter. When the known
volume is reached, shut the Master Boom Switch “OFF”.