Flow control apparatus and method with internally isothermal...

Details Flow control apparatus and method with internally isothermal... Flow control apparatus and method with internally isothermal...

2007-04-17

2007-04-17

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Using differential pressure

C406S010000

Reexamination Certificate

active

11175158

ABSTRACT:
An internally isothermal control volume of a flow verification system for measuring gas pressure drop relative to time to calculate flow rate has a thermal reservoir provided therein. The thermal reservoir is de-coupled from ambient effects so that the temperature of the thermal reservoir will be driven to the gas temperature during steady state flow of gas through the known volume and during gas expansion, will transfer heat to maintain a contrast gas temperature for accurate gas flow rate calculation with minimal effect from external influence during the verification process.

REFERENCES:
patent: 4782888 (1988-11-01), Bardenheier
patent: 5925829 (1999-07-01), Laragione et al.
patent: 6363958 (2002-04-01), Ollivier
patent: 6450200 (2002-09-01), Ollivier
Arnberg, B.T., Two Primary Methods of Proving Gas Flow Meters, Symposium on Flow: Its Measurement and Control in Science and Industry, Paper No. 3-8-216, 1971.

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