Density monitor and method

Claim 1

An apparatus for determining the density of a gas comprising: (a) a fluidic oscillator; (b) means for establishing flow of a sample of the gas through said oscillator; (c) means for controlling the pressure at which the sample passes through said oscillator; (d) means for measuring the temperature of the sample at said oscillator and transmitting a signal representative of the temperature, said temperature being designated as T; (e) means for measuring the frequency of oscillation at said oscillator and transmitting a signal representative of the frequency, said frequency being designated as F; (f) means for determining the temperature of said gas at the point at which said density is determined and transmitting a signal representative of the temperature, said temperature being designated as T 1 ; (g) means for measuring the pressure of said gas at said point of density determination and transmitting a signal representative of said pressure, said pressure being designated as P 1 ; (h) computing means for calculating the density of said gas by the relationship of P 1 , T, T 1 and F in accordance with the equation ##STR1## wherein, D=density of said gas K 1 =a constant G=specific heat ratio of said gas flowing through said oscillator T=temperature of said gas flowing through said oscillator P 1 =pressure of said gas at said point of density determination F=frequency of oscillator output signal Z=compressibility factor R=universal gas constant T 1 =temperature of said gas at said point of density determination; and (i) means for communicating information contained in said computing means.

Claim 2

An apparatus for determining the density of a gas comprising: (a) a fluidic oscillator; (b) means for establishing flow of a sample of the gas through said oscillator; (c) means for controlling the pressure at which the sample passes through said oscillator; (d) means for measuring the temperature of the sample at said oscillator and transmitting a signal representative of the temperature, said temperature being designated as T; (e) means for measuring the frequency of oscillation at said oscillator and transmitting a signal representative of the frequency, said frequency being designated as F; (f) means for determining the temperature of said gas at the point at which said density is determined and transmitting a signal representative of the temperature, said temperature being designated as T 1 ; (g) means for measuring the pressure of said gas at said point of density determination and transmitting a signal representative of said pressure, said pressure being designated as P 1 ; (h) computing means for calculating the density of said gas by the relationship of P 1 , T, T 1 and F in accordance with the equation ##STR1## wherein, D=density of said gas K 1 =a constant G=specific heat ratio of said gas flowing through said oscillator T=temperature of said gas flowing through said oscillator P 1 =pressure of said gas at said point of density determination F=frequency of oscillator output signal Z=compressibility factor R=universal gas constant T 1 =temperature of said gas at said point of density determination; and (i) means for communicating information contained in said computing means.

Claim 7

A method for determining the density of a gas comprising: (a) passing a sample of said gas through a fluidic oscillator at a controlled pressure; (b) measuring the temperature of the sample at said oscillator and transmitting a signal representative of the temperature, said temperature being designated as T; (c) measuring the frequency of oscillation at said oscillator and transmitting a signal representative of the frequency, said frequency being designated as F; (d) determining the temperature of said gas at the point at which said density is determined and transmitting a signal representative of the temperature, said temperature being designated as T 1 ; (e) measuring the pressure of said gas at said point of density determination and transmitting a signal representative of said pressure, said pressure being designated as P 1 ; (f) calculating the density of said gas by the relationship of P 1 , T, T 1 and F in accordance with the equation ##EQU10## wherein, D=density of said gas K 1 =a constant G=specific heat ratio of said gas flowing through said oscillator T=temperature of said gas flowing through said oscillator P 1 =pressure of said gas at said point of density determination F=frequency of oscillator output signal Z=compressibility factor R=universal gas constant T 1 =temperature of said gas at said point of density determination; and (g) communicating information contained in said computing means.

Claim 8

A method for determining the density of a gas comprising: (a) passing a sample of said gas through a fluidic oscillator at a controlled pressure; (b) measuring the temperature of the sample at said oscillator and transmitting a signal representative of the temperature, said temperature being designated as T; (c) measuring the frequency of oscillation at said oscillator and transmitting a signal representative of the frequency, said frequency being designated as F; (d) determining the temperature of said gas at the point at which said density is determined and transmitting a signal representative of the temperature, said temperature being designated as T 1 ; (e) measuring the pressure of said gas at said point of density determination and transmitting a signal representative of said pressure, said pressure being designated as P 1 ; (f) calculating the density of said gas by the relationship of P 1 , T, T 1 and F in accordance with the equation ##EQU10## wherein, D=density of said gas K 1 =a constant G=specific heat ratio of said gas flowing through said oscillator T=temperature of said gas flowing through said oscillator P 1 =pressure of said gas at said point of density determination F=frequency of oscillator output signal Z=compressibility factor R=universal gas constant T 1 =temperature of said gas at said point of density determination; and (g) communicating information contained in said computing means.