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203
A
PPLICATION
L
IQU
ID
R
ATE
C
ONTROL
• Allowable Error
Default Value: 2%
2% - 3% is the normal dead band setting range.
- Too low of a setting value can cause the product control system to continually hunt for the target
application rate.
- Too high of a setting will cause excessive product application error.
D
ICKEY
-J
OHN
NH3 C
ONVERSIONS
Conversion Formulas
The following formulas can be used to convert the Dickey John flow sensor constant to a value that
represents pulses/gallon of anhydrous ammonia for use by the display.
Note: The flow sensor constant is tagged on the Dickey-John flow meter. The density setting comes from a
chart in the Dickey-John documentation and is not provided in this manual.
T
ROUBLESHOOTING
S
ERIAL
C
ONTROL
A
PPLICATIONS
Problem: Rate changes on the display, but not on the controlled console.
Solution:
1. Verify the current firmware is running on the display and Application Rate module.
2. Check the settings specific to your controlled console. (For more information, refer to the Quick
Reference Guide).
3. Check cabling and all connections.
4. Disconnect the serial connection and determine if the controller is functioning properly without
the display.
Problem: The display rate and serial-controlled rate do not match.
Solution:
1. Verify the current firmware is running on the display and the Application Rate Module.
2. Check the percent rate change. (Refer to the Quick Reference Guide for more information).
Conversion Formula
Formula for flow meter calibration for Dickey John reading pounds of anhydrous
Flow sensor constant (pulses/in
3
) X 1728 (in
3
/ft
3
) X 5.11 (lbs of anhydrous/gal)
Solution: Density (lbs. of anhydrous/ft
3
)
Formula for flow meter calibration for Dickey John reading pounds of Nitrogen
Flow sensor constant (pulses/in
3
) X 1728 (in
3
/ft
3
) X 4.22 (lbs of N/gal)
Density (lbs. of N/ft
3
)