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CHAPTER
8
Issue 1:
Raven control console reports inaccurate AccuFlow™ measurements (i.e. console indicates more product
applied than actual product removed from tank).
Record the operating temperature and pressure as well as static tank pressure from the AccuFlow gauges
1.
mounted on manifold. Refer to Figure 1, "Typical AccuFlow System (Single Section, Two Valves)," on
page 12 for assistance locating gauges.
Verify that NH
is in a liquid state at the flow meter by comparing the observed gauge readings to the
2.
3
Figure 2, "Pressure vs. Temperature Chart," on page 30.
Note:
To properly measure and control application, anhydrous ammonia must be in a liquid state when it
passes through the flow meter. To remain liquid, anhydrous ammonia must be stored at a
temperature of -28° F [-33° C] or kept under pressure at higher temperatures.
If the observed gauge readings and Figure 2 on page 30:
indicate that NH
a.
cable connections before proceeding to step 3.
do not indicate liquid NH
b.
Refer to Figure 1, "System Capacity Chart," on page 27 to verify that the target application speed is below
3.
the maximum speed allowed for the implement width and the target rate.
If the maximum speed is exceeded, reduce the application speed.
a.
If the application speed is within allowable range, skip to step 5.
b.
Refer to the system diagrams in Chapter 3, Standard AccuFlow™ Installation and verify that the AccuFlow
4.
system is plumbed correctly. If the system is plumbed correctly, proceed to step 5.
Manual No. 016-0171-496 Rev. C
T roubleshooting
C h a p t e r 8
Anhydrous ammonia may be under pressure.
Before disconnecting any fittings or hoses, be
sure to purge the system of all liquid NH
the Discharging the AccuFlow™ System
section on page 50).
is in a liquid state (non-vapor), check and clean the AccuFlow flow meter and check
3
is passing through the flow meter, skip to step 4.
3
WARNING
3
(see
57
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