Method and apparatus for compensating a manifestation of fluid flow for temperature and specific gravity

Claim 3

The method of claim 1 wherein said second signal is an analog signal; and, wherein said second signal is modified by selectively amplifying said second signal as a function of the specific gravity of the fluid and thereafter providing said third signal related in pulse recurrence rate to the amplitude of said amplified signal.

Claim 4

The method of claim 2 wherein the predetermined duration of each of the time intervals is determined by the accumulation of a predetermined number of pulses in said fourth signal following a pulse in said first signal.

Claim 5

Apparatus for monitoring fluid flow comprising: means for providing a first signal having a pulse recurrence rate related to fluid flow; means for providing a second signal having a pulse recurrence rate related to physical condition of the fluid being monitored; means for selectively modifying the relationship of the pulse recurrence rate of said second signal to said physical condition; means for providing a third signal having a predetermined pulse recurrence rate; means responsive to said first, second and third signals for providing packets of pulses, the number of pulses in each packet being related to the difference between the number of pulseS in said second and third signals during a time interval of predetermined duration and the number of packets being related to the number of pulses in said first signal; and, means for accumulating the number of pulses in a plurality of successive packets of pulses.

Claim 6

Apparatus for monitoring fluid flow comprising: means for providing a first signal having a pulse recurrence rate related to fluid flow; means for providing a second signal having a pulse recurrence rate related to physical condition of the fluid being monitored; means for selectively modifying the relationship of the pulse recurrence rate of said second signal to said physical condition; means for providing a third signal having a predetermined pulse recurrence rate; means responsive to said first, second and third signals for providing packets of pulses, the number of pulses in each packet being related to the difference between the number of pulseS in said second and third signals during a time interval of predetermined duration and the number of packets being related to the number of pulses in said first signal; and, means for accumulating the number of pulses in a plurality of successive packets of pulses.

Claim 7

The apparatus of claim 4 including: means for counting the pulses in said third signal which are generated subsequent to a pulse in said first signal; and, means responsive to pulse counting means for terminating the time intervals during which said packets of pulses are provided.

Claim 8

The apparatus of claim 5 wherein the physical condition to which said second signal is related is the temperature of the fluid; and, wherein the relationship between the number of pulses in said second signal and temperature is selectively modified as a function of the specific gravity of the fluid.

Claim 9

The apparatus of claim 4 wherein the physical condition to which said second signal is related is the temperature of the fluid; and, wherein the relationship between the number of pulses in said second signal and temperature is selectively modified as a function of the specific gravity of the fluid.

Claim 10

Apparatus for compensating a fluid flow measuring system comprising: means for producing a first signal related to gross fluid flow; means for providing a second signal related by a multiple to a variable physical condition of the fluid; means for producing a third signal having a predetermined pulse repetition rate; means for algebraically combining said third signal with said first signal to prvide a combined signal; and, means for reducing said combined signal by said multiple to thereby provide a fluid flow signal compensated for the variable physical condition of the fluid.

Claim 11

Apparatus for compensating a fluid flow measuring system comprising: means for producing a first signal related to gross fluid flow; means for providing a second signal related by a multiple to a variable physical condition of the fluid; means for producing a third signal having a predetermined pulse repetition rate; means for algebraically combining said third signal with said first signal to prvide a combined signal; and, means for reducing said combined signal by said multiple to thereby provide a fluid flow signal compensated for the variable physical condition of the fluid.

Claim 12

The apparatus of claim 8 wherein the variable physical condition to which said second signal is related is the temperature of the fluid; and, including means for modifying the relationship between said second signal and the temperature of the fluid as a function of the specific gravity of the fluid.

Claim 13

Apparatus for compensating fluid flow for a variable physical condition comprising: means for providing a first signal having a pulse recurrence rate related to fluid flow; means for providing a second signal having a pulse recurrence rate related to a variable physical condition of the fluid; means for providing a third signal having a predetermined pulse recurrence rate; a counter; and, gate means responsive to the pulses in said first signal to supply packets of pulses to said counter in a time interval related to the accumulation of a predetermined number of pulses in said third signal, the pulse recurrence rate of said third signal being greater than the maximum pulse recurrence rate of said second signal, the number of pulses supplied to said counter being the same as the number of pulses in said first signal at the value of the variable physical condition of the fluid for which no compensation of fluid flow is desired, and the number of pulses in said third signal being related to the mathematical sum of (a) the number of pulses in said second signal at the value for which no compensation of fluid flow is desired, and (b) the number of pulses in said first signal.

Claim 14

Apparatus for compensating fluid flow for a variable physical condition comprising: means for providing a first signal having a pulse recurrence rate related to fluid flow; means for providing a second signal having a pulse recurrence rate related to a variable physical condition of the fluid; means for providing a third signal having a predetermined pulse recurrence rate; a counter; and, gate means responsive to the pulses in said first signal to supply packets of pulses to said counter in a time interval related to the accumulation of a predetermined number of pulses in said third signal, the pulse recurrence rate of said third signal being greater than the maximum pulse recurrence rate of said second signal, the number of pulses supplied to said counter being the same as the number of pulses in said first signal at the value of the variable physical condition of the fluid for which no compensation of fluid flow is desired, and the number of pulses in said third signal being related to the mathematical sum of (a) the number of pulses in said second signal at the value for which no compensation of fluid flow is desired, and (b) the number of pulses in said first signal.

Claim 15

The apparatus of claim 10 including: means for counting the pulses in said third signal which are generated subsequent to a pulse in said first signal; and, means responsive to said pulse counting means for terminating the time intervals during which said packets of pulses are provided.