Method for measuring net internal volume of a receptacle contain

Details Method for measuring net internal volume of a receptacle contain Method for measuring net internal volume of a receptacle contain

1987-03-23

1988-08-16

Noland, Tom

Measuring and testing

Volumetric content measuring

73290B, 73 1H, 141 5, 222 1, G01F 1700

Patent

active

047635185

ABSTRACT:
A method for measuring the net internal volume of test receptacles each containing an unknown but variable volume of a liquid, such as in testing automatic transmissions containing residual amounts of transmission fluid, to determine the exact volume of fluid needed to be added to fill the transmission to the correct level. The method places a pressurized reference vessel in communication with the internal spaces of a sealed transmission upon opening of a valve allowing the pressure to fall by expansion from the reference vessel into the transmission. The resulting reduced pressure is initially sensed shortly after the valve is opened, and subsequently after a more prolonged interval, allowing the pressure to be substantially stabilized. The receptacle net internal volume is then determined from the relationship between the preliminary pressure in the reference vessel and the stabilized final pressure by application of Boyle's law, and the volume of liquid to be added calculated therefrom. The difference between the initial and subsequent pressure readings sensed after the valve is opened is used to generate a correction applied to the calculated volume to offset the error created by an outflow through any small leaks which might exist.

REFERENCES:
patent: 1885926 (1932-11-01), Lewis
patent: 3113448 (1963-12-01), Hardway, Jr. et al.
patent: 3744306 (1973-07-01), Krueger

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