Planting – Liquid or gas soil treatment – Treating substance includes ammonia
Patent
1998-05-29
2000-05-30
Novosad, Christopher J.
Planting
Liquid or gas soil treatment
Treating substance includes ammonia
A01C 2302
Patent
active
060679174
ABSTRACT:
The present invention provides an apparatus and method for accurately controlling the amount of NH.sub.3 to be applied to a field by measuring the NH.sub.3 flow rate without condensing or cooling the NH.sub.3. The system includes a control station 12 on the vehicle with a tachometer 12A or a GPS system for providing a vehicle speed signal to a control panel 13. The control panel includes a toggle switch 17 for adjusting the opening or closing of a valve 52 in the flow line to regulate the flow through the system, although the control panel alternatively may automatically control the valve 52. The vehicle transports a tank 20 containing liquid NH.sub.3 and a tool bar 30 for distributing the NH.sub.3 to the soil. After flowing through the flow meter 40, 60, 130, the NH.sub.3 is conducted to the soil through a series of hoses, fittings, a distributor, and tubing. The flow meter transmits a signal to the control panel, which is converted to a corrected flow rate signal in response to a fixed value vaporization correction factor. The temperature of the NH.sub.3 is also measured to correct for density variations. An improved variable area meter 60, 130 uses a hall effect sensor 72 and a magnet 68 mounted on a rotatable vane shaft 70 to overcome problems with prior flow meters. The improved meter 60, 130 is ideally suited for measuring the fluid flow of a low temperature vaporization liquid, such as anhydrous ammonia, propane and butane.
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Cessac Kevin J.
Nimberger Spencer M.
Novosad Christopher J.
PGI International Ltd.
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