Tokheim Corporation

Hans Ulrich Bloss

Tom Taivalkoski

Harald G&ouml;rres

A pick-up assembly for use in a liquid dispensing system utilizes a Hall-effect sensor integrated within a flowmeter to provide a measure of the rotational velocity of the rotor and hence the flow rate of liquid being transmitted through the liquid line. The rotor is modified to include at least one recessed area defined in its outer surface and which exhibits magnetic properties. The Hall-effect sensor includes a first and second Hall-effect element each generating a respective channel signal that is representative of the rotational velocity of the rotor. The Hall-effect sensor is suitably arranged with respect to the rotor so as to enable each one of the recessed areas to exert a characteristic magnetic influence upon the Hall-effect sensor during shaft rotation. The variable magnetic flux experienced by the Hall-effect sensor appears as a corresponding variation in the voltage signal generated by the sensor. The rate of generation of such magnetic field variations is representative of the rotational velocity of the rotor.

Hall-effect sensor placed in flowmeter to measure fuel flow rate

An integrated pump and meter having a spindle axially extending in the direction of the flow of fluid for pumping and metering the flow of fluid. A volume of fluid pumped is calculated as a function of spindle rotation. In one particular of embodiment, a pair of pressure sensors are located at the inlet and outlet of the pump/meter, respectively for computing a gap loss volume due to fluid passing between the pump/meter spindle and the cylinder wall. The gap loss volume and calculated flow volume are combined to calculate a total volume of fluid to be dispensed.

Pump/meter combination

An apparatus and a method of measuring the volume of flowing media, especially of fuel, by means of a screw spindle volumeter, the method comprising the following steps: detecting the revolutions of a screw spindle by means of a sensor and producing pulses whose time sequence is representative of the angular speed of the screw spindle; repeatedly measuring the period of time between successive pulses; selecting, in dependence upon the respective period of time measured, a volume value predetermined for said period of time, said volume value being representative of the volume flowing through the volumeter per predetermined revolution angle of the spindle at the respective angular speed of the spindle; adding the volume values which have successively been selected for various time period measurements, and producing and preferably displaying a total volume value that is based on the sum obtained during the whole volume measurement by continuously adding the volume values.

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Nuremberg, Germany

Hans Ulrich Bloss