Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1996-02-23
1997-02-11
Thorpe, Timothy
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 42, 417 43, 417 4411, 417 53, 7386177, 222 63, 222 66, F04B 4900
Patent
active
056014139
ABSTRACT:
A method and apparatus for automatically shutting off a dispensing device when the fluid source tank is empty includes a programmed pump controller in communication with the dispensing device and a flowmeter having a pulse generator. Upon startup of the dispensing device, the controller waits for an initial time period, then periodically determines the pulse frequency which correlates to a rate of fluid flow. The pulse frequency is compared to a calculated average pulse frequency and, if the pulse frequency has changed a pre-selected, pre-determined amount or percentage when compared to the average pulse frequency the dispensing device is shut-off. The change in pulse frequency indicates ingestion of air into the pumping system meaning an empty source tank.
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Product Bulletin entitled "DryLock Closed Dispensing System" published by Aeroquip Corporation, Maumee, OH 1994.
Hansen David L.
Langley Gregory A.
Great Plains Industries Inc.
Thai Xuan M.
Thorpe Timothy
LandOfFree
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