04831866 is referenced by 41 patents and cites 27 patents.

An apparatus for and method of calibrating a fluid meter having an output transformable into a series of digital pulses, where each pulse represents a certain volume of liquid through the meter that changes as a result of meter wear and/or component failure. A microprocessor controlled bidirectional prover tube having a calibrated volume is provided in the dispenser housing for operation once during each of a predetermined number of dispensing events. The digital pulses are accumulated during dispensation of the calibrated volume of fluid through the prover, and a calibration factor is automatically calculated and applied to the digital pulses prior to being supplied to an electronic display unit for accurate computation and display of the volume of liquid through the meter. A four-port, two-position valve is actuated prior to the beginning of each dispensing event by the microprocessor to reverse flow through the prover tube.

Title
Automatic meter proving and calibration system
Application Number
7/118552
Publication Number
4831866
Application Date
November 9, 1987
Publication Date
May 23, 1989
Inventor
William D Key
Leo
IN, US
Maurice J Forkert
Fort Wayne
IN, US
Agent
Jeffers Hoffman & Niewyk
Assignee
Tokheim Corporation
IN, US
IPC
G01F 25/00
View Original Source