Integrated fuel pump/counter unit, for automobile filling station, uses rotation sensor for one of two motor driven rotors

Integrated fuel pump/counter unit has casing (55) having an input (48) and output (49); a fluid flow axis (58,59) along which the fluid escapes; at least two endless screw rotors (50,52) axially extending along the fluid flow axis; a motor (54) rotating a single rotor (50) to make the fluid flow, a rotor rotation sensor (74) detecting the rotation of the rotor (52); a pair of pressure sensors (78,80) one at the input and the other at the output. The integrated pump has also a computer (40), for producing a volume flow signal, associated with the operation of the rotation sensor. The signal is used to display fuel distribution volume from the output. The computer also calculates the pressure difference between the input and output pressures given by the pressure sensors and generates the volume flow signal as a function of the rotor rotation and pressure difference. The computer can also generate volume flow as a function of viscosity, temperature and fluid composition. An Independent claim is also included for: (1) a method for simultaneously pump and measure fluid; (2) a fuel dispenser. Pompe et compteur de carburant intégrés comportant un rotor (50, 52) s'étendant axialement dans la direction d'écoulement du fluide pour pomper et mesurer le débit de fluide. Un volume de fluide pompé est calculé en fonction de la rotation du rotor. Dans un mode de réalisation particulier, une paire de capteurs de pression (78, 80) sont placés à l'entrée (48) et à la sortie (49) de la combinaison de pompe/ compteur (22), respectivement pour calculer un volume de perte d'interstice dû au fluide passant entre le rotor de pompe/ compteur (50, 52) et la paroi de cylindre (62, 68). Le volume de pertes d'interstice et le volume de débit calculé sont combinés pour calculer un volume total de fluide à distribuer.