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844E Sprayer Control
Pressure Transducer
Maximum rating (P Hi)
Default =
150
(PSI in
US
,
trF
and
I
N
P
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.
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
fi
nishes 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.
