Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1988-05-02
1989-08-08
Levy, Stewart J.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01F 2500
Patent
active
048541540
ABSTRACT:
A mechanical displacement flowmeter calibrator has a first fluid line external of the measuring cylinder of the calibrator connected between the inlet and outlet thereof. A flowmeter that produces flow-representative passes is connected in the fluid line. A rod is connected to a measuring piston adapted to travel through the measuring cylinder as a fluid barrier. The rod draws the measuring piston through the measuring cylinder at a predetermined, constant speed and thereby determines the flow rate of the calibration. A reservoir means, connected to the measuring cylinder, is provided which maintains the pressure within the measuring cylinder at a substantially constant value. The displacement of the measuring piston is sensed as it travels through the measuring cylinder during a test run, while the pulses produced by the flowmeter are counted during the time interval in which the piston displaces a given volume. The flowmeter is preferably connected in the fluid line at the pressure null point. The measuring cylinder is preferably provided with a larger second external fluid line connected between the ends of the measuring cylinder. The second external fluid line is provided with a check valve which permits the flow of fluid through the second fluid line when the measuring piston is returned to its starting point at the completion of a test run.
REFERENCES:
patent: 3421360 (1969-01-01), Luse et al.
patent: 3673851 (1972-07-01), Wright et al.
patent: 3877287 (1975-04-01), Duntz, Jr.
patent: 4152922 (1979-05-01), Francisco, Jr.
patent: 4627267 (1986-12-01), Cohrs et al.
patent: 4649734 (1987-03-01), Hillburn
Flow Technology, Inc.
Levy Stewart J.
Raevis Robert R.
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