TeeJet 844 Sprayer Control - Manual (Page 21)

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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.
Depress 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.
Depress 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, depress 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. Depressing the
and keys simultaneously will clear the value to zero.
When the correct value has been entered, depress 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).
NOZZLE
SPACING
4.0
P ref