15
Pressure Transducer Maximum Rating (P Hi)
Default = 150 (psi in US, trF and INP Modes)
Default =
10.0 (bar in SI Mode)
This step is used to set the maximum rating of the pressure transducer in your
system. This number can be found stamped on the pressure transducer itself. If
your transducer has a maximum rating of 145 psi (10 bar in SI mode) and that
number is shown in the display, then advance to the next step by pressing the
key. If, however, the maximum rating is 363 psi (25 bar in SI mode), use the
and keys to change the value. Press the key to advance to the next
step.
NOTE: If you are not using a pressure transducer but are using a flow
meter instead, skip this step by pressing , leaving the default value
programmed.
Pressure Transducer Low Pressure Calibration (P rEF)
Default = 4.0
This step is used to calibrate the “0” pressure setting of the pressure transducer
installed in your system.The pressure transducer used with the 844 is a current
type transducer and uses a 4-20 mA reading. 4.0 mA represents 0 pressure.
This step uses an auto-calibration feature to calibrate the transducer. Make sure
that the sprayer pump is off and there is absolutely no pressure in the system.
Press and release the and keys simultaneously to activate the auto-
calibration feature.You will see the message “
NES” in the lower left of the display
and the lower right of the display count the numbers “
0” through “9”. When the
display finishes counting, a number close to 4.0 should be displayed.The low
pressure value of the transducer is now calibrated.
Press the key to advance to the next step.
NOTE: If you have selected a “FLO” based system, skip this step by pressing
and leave this value at the default of 4.0.
Nozzle Spacing
Default = 20 (inches in US, trF, and INP Modes)
Default =
50 (cm in SI Mode)
Default =
30 (inches in nh3 Mode)
While in the Nozzle Spacing step, the symbol will be flashing at the top of
the console display. Nozzle spacing should be recorded in inches (cm in SI mode).
If the default value is correct, press the key to accept the value. If the nozzle
spacing is different than that shown as a default, then add or reduce this number
by using the or keys to record the new value. Pressing the and
keys simultaneously will clear the value to zero.
When the correct value has been entered, press the key to accept the value
and advance to the next step.
When broadcast or broadacre spraying, enter the nozzle spacing in the display.
If banding, enter the band width as your spacing.
If directed spraying, enter the row spacing divided by the number of nozzles per
row as your spacing.
NOTE: All Application rate readings (US GPA, G/1000 ft
2
, #N/acre, Imp. GPA,
and l/ha) and area readings are expressed in treated acres (hectares).
150
P Hi
NOZZLE
SPACING
4.0
P ref
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