TeeJet 844-AB Sprayer Control - Manual (Page 9)

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98-70007-EN R4
844-AB
Reset to default
If units of measurement changes were made, the console will display
a message asking if programme parameters should be reset to
default before advancing to the next screen. Use the Plus or
Minus keys to select either “Yes” or “No” on the screen. Press the
Programme key to accept the value and advance to the next
programme step.
NOTE: If changes were not made to Units of measurement, this
step will be skipped and the screen will advance to Sensor
selection.
Figure 17: Reset to default
YES
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rES
dEF
Sensor selection
The 844-AB can accommodate a flow meter, pressure transducer or
both. Sensor selection instructs the console which sensor is being
used on the sprayer. The default value is “FLO” (flow-based system)
using a flow meter. To maintain this setting, press the Programme
key to advance to Flow meter impulses. To change the setting to
“PRS” (pressure based system), use the Plus or Minus keys
to select “PRS”. Press the Programme key to advance to Flow
meter impulses.
NOTE: Pressure-based regulation is used only with linear nozzles.
For non-linear nozzles, ALWAYS select flow-based
regulation. Most nozzles are linear and may be used with
pressure-based regulation. ConeJet nozzles are non-linear.
If both sensors have been installed on the sprayer, this step will
determine which sensor will be used.
◄If “FLO” is selected, the flow meter will be used to control flow
and the pressure transducer will be used only to display actual
pressure.
◄If “PRS” is selected, the pressure transducer will be used
to control flow and display the actual pressure. Flow meter
signals will be ignored.
The regulation mode determines the following programme steps.
◄If “FLO” is selected, the next Setup mode screen displayed
will be the calibration step for the flow sensor (refer to Flow
meter impulses).
◄If “PRS” is selected, the next Setup mode screen displayed
will be the calibration step for the pressure transducer (flow
sensor calibration will be skipped).
Figure 18: Sensor selection
FLO
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Flow meter impulses
During the Flow meter impulses step, the symbol (flow meter
turbine) will flash at the top of the console. The flow meter calibration
number can be entered manually from the factory-calibrated flow
meter pulse rate tag or an Auto calibration procedure can be
activated to determine flow meter impulses based on a known
volume of fluid.
Figure 19: Flow meter impulses
650
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Manual entry
Locate the factory-calibrated flow meter pulse rate tag on the flow
meter. If this varies from the default value (it usually does) of the
console, use the Plus or Minus keys to modify the value.
In some cases, larger flow meters with small calibration numbers
will include decimals for greater accuracy. To add a decimal to the
calibration number, press the Auto/man key.
Automatic calibration
To complete an automatic calibration of the flow meter, press the
Plus and Minus keys simultaneously. This will clear the
existing value and initiate the calibration procedure. “CAL” will be
displayed in the screen. This indicates that the controller is ready to
begin the calibration process.
Figure 20: Calibration procedure
CAL
0
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Engage the sprayer pump. Turn the boom sections “On” and begin
spraying a known volume of fluid (e.g. 400 litres). As the known
amount is sprayed, the console will count the impulses. After the
known volume has been sprayed, turn the Master switch “Off” to stop
counting impulses.
Figure 21: Calibration procedure
CAL
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