Flow calibrator

Details Flow calibrator Flow calibrator

1993-09-10

1995-08-15

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

Expansible chamber

73 3, 73232, 73239, 73243, 73247, 7386147, 7386154, 92155, 921701, 92222, 92248, G01F 100

Patent

active

054409250

ABSTRACT:
The invention relates to a high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly to a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clearance seal with the inside of the cylinder, an encoder (40) associated with the piston, and a control valve (V) for controlling the supply of a fluid flow (A1) to be measured. More generally, the flowmeter includes a channel for receiving a fluid flow so as to move the piston (10) within its enclosure (12); and a device (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. Preferably, the flowmeter system includes a damping device (FIGS. 6A-6D) which may be mechanical, pneumatic, or fluidic. A memory device (e.g., 109) may be provided for supplying data representative of the capacity of the cell, and the fluid flow may be calculated (100) as a function of the cell capacity.

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