Scott R Calvert

US Patent:

54409250, Aug 15, 1995

Filed:

Sep 10, 1993

Appl. No.:

8/119808

Inventors:

Harvey F. Padden - Pompton Lakes NJ
Frank C. Rumore - Mahwah NJ
Scott R. Calvert - Hewitt NJ

Assignee:

Computer Control Corporation - Pompton Plains NJ

International Classification:

G01F 100

US Classification:

73253

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.

US Patent:

54561078, Oct 10, 1995

Filed:

Apr 18, 1994

Appl. No.:

8/229385

Inventors:

Harvey F. Padden - Pompton Lakes NJ
Frank C. Rumore - Mahwah NJ
Scott R. Calvert - Hewitt NJ

Assignee:

Computer Control Corp. - Pompton Plains NJ

International Classification:

G01M 1900

US Classification:

73239

Abstract:

A high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly 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. The flowmeter may have an arrangement for receiving differently-sized interchangeable modules for measurement of different flow rate ranges, each module having for example a compatible piston and cylinder of a predetermined size. The flowmeter includes a channel for receiving a fluid flow so as to move the piston (10) within its cylinder (12); and a device (36, 38) including the encoder (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.