초록 ▼

A fail-safe fluid transfer control apparatus has full redundancy in the response to various inputs such as overfill probe signals, ground detection signals, and the like. Independent microprocessor controllers independently evaluate the inputs and each output control signals to close a respective re

A fail-safe fluid transfer control apparatus has full redundancy in the response to various inputs such as overfill probe signals, ground detection signals, and the like. Independent microprocessor controllers independently evaluate the inputs and each output control signals to close a respective relay when the inputs indicate that fluid transfer may commence. The relays are arranged in series such that both must be closed for a fluid transfer to commence. The control signals from each controller include a static signal and an alternating signal, both of which must be properly output to close its respective relay. Each controller monitors the state of each relay, and discontinues its control signals if either relay appears to be malfunctioning. Each controller runs an different, independently written firmware program to process the detected inputs to prevent a common firmware error. An optical bypass key replaces conventional mechanical keys and transmits an optically encoded signal to the controller for establishing a bypass condition. A preheating circuit is also provided for providing a dynamic voltage supply to standard thermistor probes which may be encountered.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling a fluid transfer control apparatus for transferring fluid from a fluid source to a receiving container in which an overfill probe detects when fluid in the container reaches a predetermined level and in which the overfill probe is one of a five-wir

[ What is claimed is:] [1.] A method of controlling a fluid transfer control apparatus for transferring fluid from a fluid source to a receiving container in which an overfill probe detects when fluid in the container reaches a predetermined level and in which the overfill probe is one of a five-wire type probe or a two-wire type probe, the method comprising:applying a five-wire test signal to the probe;detecting any five-wire return signal received within a predetermined time limit;if a five-wire return signal is detected, configuring the fluid transfer control apparatus for five-wire overfill probe operation; andif a five-wire return signal is not detected, testing the probe for the presence of a valid two-wire probe signal and configuring the fluid transfer control apparatus for two-wire overfill probe operation if a valid two-wire signal is detected.