Raven AccuFlow, Installation & Operation Manual

Page: 61 / 90

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