2 - Operation
2.9 Forward Speed and Flow Rate Alarm
You can preset upper and lower thresholds for forward speed and flow rate based on
data from the manufacturers nozzle charts of the acceptable flow/pressure operating
range. Also the system can regulate correctly only within a certain range depending
on the size of the control valve and flow sensor fitted.
If these limits are exceeded then the instrument will automatically alarm. First of all
the screen will change to show the alarm screen and the message 'FLOW LOW 1' or
'FLOW HIGH 1' (where the number is the instrument channel number). The
instrument will beep continuously.
'FLOW HIGH' may be caused by the control valve being unable to dump sufficient
flow back to the sprayer tank as a result of:- speed too slow or stationary, too small or
too few nozzles in use - sections off or blocked nozzles, pump capacity too large or
control valve too small.
'FLOW LOW' may be caused by:- forward speed too high, insufficient pump capacity,
low pump speed, low or empty tank, blocked filters or incorrect jets.
Press any of the lower 'OK' keys to cancel the alarm screen and return to the 'MAIN'
operating screen. An alarm bell icon in the upper right hand corner of the screen will
continue to flash and the instrument will beep every 5 seconds to remind you of the
alarm condition, until the forward speed and/or flow rate return within the preset
limits.
2.9.1 Spray performance Indicator
The Spray performance Indicator shows the nozzle performance within the minimum
and maximum parameters displayed on the Nozzle Wizard page. The "Target Speed"
is at the middle of the speed range.
For optimum nozzle performance and spray pattern you should maintain your forward
speed as close to the "target" speed as possible.
2.9.2 Setting the Alarm thresholds
1 Press to select the "SETUP" menu.
2 Select the "ALARMS SETUP" screen (fig.15).
3 Select the appropriate alarm threshold using the arrow keys and enter the value via
the numeric keypad.
Too slow At "Target" speed
(for optimum spray
performance)
Figure 15
Selecting the ALARMS
SETUP screen
Too fast
6. ALARMS SETUP
1. SENSOR CONFIGURATION
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