Fluid density variation compensation for fluid flow volume measu

Details Fluid density variation compensation for fluid flow volume measu Fluid density variation compensation for fluid flow volume measu

1997-01-03

1997-08-12

Biegel, Ronald L.

Measuring and testing

Volume or rate of flow

With indirect temperature or density compensation

73 3002, 73 135, 364510, G01F 100

Patent

active

056567847

ABSTRACT:
A fluid density compensator for flow volume measurements utilizes a plurality of look-up calibration tables, each for a different density gas. The measurement device provides an output signal having a frequency corresponding to the flow rate therethrough. Each of the tables is indexed by frequency and includes, for each frequency, an expected differential pressure reading across the measurement device and a volume factor. The tables are constructed during the manufacture of the meter measuring device, and are stored in a non-volatile memory of a computer associated with the measuring device. Also associated with the measuring device is a differential pressure sensor across the measuring device. During operation, the output frequency of the measuring device is utilized to index into all of the tables and compare the differential pressure stored in the tables with the actual measured differential pressure. The table having the closest comparison is selected and the volume factor stored in that table is utilized to update the calculated flow volume.

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