FLOW CALIBRATOR

摘要

A positive displacement flowmeter which includes a cylinder (12), a piston (10) within the cylinder (12) which makes a clearance seal with the inside of the cylinder, an encoder (40) and a control valve (V) for controlling the supply of a fluid flow (A1) to be measured. More generally, the flowmeter includes channeling means (24) for receiving and directing the flow so as to move the piston (10) within its enclosure (12); and means (36, 38, 40) for detecting movement of the piston and generating electrical signals representative of the fluid flow to be measured. The movement of the piston is detected as a function of a known volume of the enclosure traversed by the piston, and a measured variable elapsed time over which the piston traverses the volume. The flowmeter system includes a damping device (Figs. 6A-6D). A memory device (e.g., 109) may be provided for supplying data representative of the capacity of the cell.