Patent ID: 6676387
Filing Date: 2004-01-13
Classification: G01F

Abstract:
A metering device comprisingmeans defining a chamber comprised of two opposed ends comprising of elongate bore, each end of the elongate bore accommodating a respective probe, inner ends of which bound the chamber, at least one probe being axially adjustable in position, each probe comprising electrically conductive means extending from the inner end face of the probe, inlet means to enable fluid to enter one end of the chamber and inlet means to enable fluid to enter another end of the chamber, outlet means to enable fluid to exit from said one end of the chamber, and outlet means to enable fluid to exit from the other end of the chamber, a shuttle provided within the chamber at a position intermediate said two ends, of the chamber at least opposed ends of the shuttle being electrically conductive, the shuttle acting sealingly to separate two ends of the chamber, the shuttle being movable between two terminal positions, each probe being responsive to physical contact with the shuttle to generate a respective electric signal when the shuttle reaches each one of said two terminal positions, valve means to control fluid flow which, in one condition, permit the entry of fluid into one end of the chamber and permit the simultaneous exit of fluid from the other end of the chamber and which, in another condition, permit the entry of the fluid into said other end of the chamber and permit simultaneous exit of fluid from the said one end of the chamber, and control means adapted to change a condition of the valve means on receipt of a said electric signal generated when the shuttle reaches a said terminal position.