Measuring and testing – Gas analysis – Density or specific gravity
Patent
1986-03-06
1987-07-07
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Density or specific gravity
G01N 926, G01N 932
Patent
active
046778411
ABSTRACT:
Gas is vented through a very small orifice or pore with substantially stable pressures before and after the orifice. The orifice is designed so that the expansion through it is similar to a Joule-Thompson expansion of the gas. With ideal gas, this occurs isothermally. The flow through this orifice is determined for a selected pressure drop across it and the square of this flow is inversely proportional to the relative density. With real gases there is a slight error introduced due to a supercompressibility of the gas, but this is offset by an error in the opposite direction believed to be due to the Joule-Thompson cooling of the gas as it passes through the orifice. Substantially exact error cancellation is obtained within a preferred operating range of the pressure drop across the orifice for a given orifice diameter.
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Perry's Chemical Engineers' Handbook, Sixth Ed., McGraw Hill, Sec. 5, pp. 14-16, 1984.
Cantrell Thomas L.
Kreitman Stephen A.
Moore Stanley R.
Precision Measurement, Inc.
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