Fluid flow rate measuring and controlling device and method

Details Fluid flow rate measuring and controlling device and method Fluid flow rate measuring and controlling device and method

1998-03-19

2000-02-29

Patel, Harshad

Measuring and testing

Volume or rate of flow

Using differential pressure

7386102, 137487, G01F 137, F16K 3112

Patent

active

060295279

ABSTRACT:
A device and method of measuring and controlling the flow rate of a fluid determine analog process variables which are dependent on a volumetric flow of the fluid, and the values thus obtained are converted into digital values, the latter being corrected by an offset value which is dependent on a change of the operating parameters of analog components of the measuring system occurring in the course of operation of the system. To obtain the offset value, an analog process variable is determined during interruptions in operation, when the volumetric flow is zero, and converted into a digital value. This digital value is memorized and used as the offset value when operations are resumed. The digital corrected measured values are supplied to a digital signal processor and the flow rate control is carried out digitally. Preferably, at least one parameter memory is provided for the digital control.

REFERENCES:
patent: 3701280 (1972-10-01), Stroman
patent: 3765239 (1973-10-01), Olsson
patent: 4277832 (1981-07-01), Wong
patent: 4562744 (1986-01-01), Hall et al.
patent: 4951224 (1990-08-01), Hokynar
patent: 5469749 (1995-11-01), Shimada et al.
patent: 5573032 (1996-11-01), Lenz et al.
patent: 5613479 (1997-03-01), Gates et al.

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