High accuracy mass sensor for monitoring fluid quantity in stora

Details High accuracy mass sensor for monitoring fluid quantity in stora High accuracy mass sensor for monitoring fluid quantity in stora

1991-10-01

1993-09-21

Noland, Tom

Measuring and testing

Volumetric content measuring

73 492, 73301, 73 1H, 73292, 364509, G01F 2202, G01F 2318, G01M 332, G01L 706

Patent

active

052458695

ABSTRACT:
A mass sensoring system for monitoring the amount of fluid in a storage tank with an accuracy high enough to determine both the quantity present and the potential loss of fluid at a loss rate of 0.05 gal/hr or at least 0.1 gal/hr. The system utilizes a pressure sensor positioned at the bottom of the tank and in contact with the fluid. This device includes a bellows unit whose displacement is correlated to changes in the mass of fluid in which it is immersed, and a transducer for monitoring the position of the bellows, wherein the interior of the bellows unit is in the same atmosphere as the sensor, and the sensor is in communication with the vapor pressure immediately above the fluid in the tank. The outside of the bellows is subjected to the stored fluid. A multiple-capsule bellows assembly is coupled to an LDVT transducer in a thermal-expansion-cancelling configuration of the invention.

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