Flow measurement device

Details Flow measurement device Flow measurement device

2005-09-27

2005-09-27

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

C374S039000

Reexamination Certificate

active

06948362

ABSTRACT:
An improved flow measurement device is provided in a flow path for direct measurement of flow. An internal heat source solves the problem of heat transfer in conventional mass flow meters. The heat transfer associated with the internal heater forms the basis of flow measurement, and improved accuracy is achieved. The flow measurement device advantageously eliminates the introduction of inaccuracies, bypass errors, or inaccurate assumptions that are inherent in a conventional bypass structure. The present measurement device eliminates the need for one or more bubblers and thus overcomes bubbler pressure sensitivity and the bubbler requirement for exact (and unstable) gas vapor saturation of conventional flow measurement. The flow measurement device works equally well with gases, liquids or mixtures of gases and liquids and provides greater control over flow rates with very high degree of precision.

REFERENCES:
patent: 4932788 (1990-06-01), Yeh
patent: 5598709 (1997-02-01), Viegas et al.

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